DDLE LCD 21 - Heating AEG - Free user manual and instructions

Product type	Electronic instantaneous water heater
Brand	AEG
Model	DDLE LCD 21
Dimensions (H x W x D)	485 x 226 x 93 mm
Weight	3.6 kg
Power supply	3/PE ~ 380-415 V, 50/60 Hz
Rated power	Adjustable from 16.2 to 25.8 kW depending on voltage, preset to 21 kW
Recommended fuse protection	32 A (depending on configuration)
Maximum admissible pressure	1 MPa (10 bar)
Maximum inlet water temperature	45 °C (supplementary heating), 65 °C max
Minimum activation flow rate	> 2.5 l/min
Hot water capacity at 38 °C (example)	approx. 9.1 l/min (400 V, inlet water 15 °C)
Heating system	Bare wire, scale-resistant
Temperature adjustment range	30 to 60 °C
Display	LED, color change blue/red at 43 °C
Protection rating	IP25 (flush mounting), IP24 (surface mounting)
Energy efficiency class	A
Annual electricity consumption	477 kWh
Load profile	S
Sound power level	15 dB(A)
Maintenance	Clean with a damp cloth, descale faucets, clean the filter
Safety	Air detector, safety pressure switch, adjustable temperature limiter
Included accessories	Wall bracket, dowels, screws, plugs, template, double sleeves, gaskets, cable grommet

Frequently Asked Questions - DDLE LCD 21 AEG

How to adjust the water temperature?

Turn the temperature adjustment knob to the desired temperature (between 30 and 60 °C). The LED display changes from blue to red above 43 °C to indicate a risk of burns.

What electrical power is needed to install the device?

The device requires a three-phase power supply 3/PE ~ 380-415 V, 50/60 Hz. The rated power is adjustable and preset to 21 kW. A 32 A fuse is recommended. Consult the data table in the manual for details.

What to do if the water is not hot enough?

Check that the hot water tap is fully open. If the flow rate is too high, reduce it at the tap. The cold water inlet temperature may be too high (max 45 °C). If the problem persists, check the fuses and the device filter.

How to clean the device?

Use a damp cloth to clean the exterior. Do not use abrasive products or solvents. For faucets, descale the spouts with a commercial product. The filter in the cold water connection must be cleaned periodically.

How to descale the heating system?

The bare wire heating system is highly scale-resistant. Descaling is generally not necessary. Simply clean the flow regulator or shower head if flow decreases. Use a standard descaling product for these parts.

How to install the device under a sink?

The device can be mounted under a sink. Use the pipe kit for under-sink mounting (accessory). Follow the installation instructions in the manual: cut the openings in the back wall, install the kit and fix the device vertically.

What to do in case of water leak?

Immediately close the shut-off valve on the cold water supply. Check the hydraulic connections. If the leak comes from the device, disconnect the power supply and contact a qualified installer. Do not attempt to repair it yourself.

How to change the flow limiter?

The flow limiter is located in the cold water connection. To remove it, unscrew the connection, remove the limiter and replace the synthetic disc. If switching to 24 kW power, replace the white limiter with the supplied orange limiter.

How to restart after a water cut?

After a water cut: turn off the device by switching off the fuse. Open the hot water tap for one minute to bleed air. Then restore the mains voltage. This prevents damage to the bare wire heating system.

How to activate the temperature limitation to 43 °C?

On the inside of the cover, activate the temperature limiter to 43 °C. After activation, the adjustment range is limited between 30 and 43 °C. The display will remain blue to indicate no risk of burns.

USER MANUAL DDLE LCD 21 AEG

Electronically controlled instantaneous water heater

Operating and installation instructions 18

Technical diagram of a bathroom sink with labeled components and directional arrows indicating flow or movement.

Technical diagram showing a mechanical or fluid system with labeled components 1, 2, and directional arrows indicating flow or movement.

Technical line drawing of a door panel with internal components and directional arrows indicating movement (no text or symbols)

Technical diagram showing two views of a mechanical assembly with directional arrows indicating movement (no text or symbols present)

Technical diagram of a mechanical assembly with mounting holes and a rod, shown without any text or symbols.

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Technical diagram showing mechanical assembly with labeled parts and directional arrows, including a numbered reference.

Technical line drawing of an industrial machine interior with no visible text or symbols

Technical line drawing of an electrical enclosure with internal components and a magnified inset showing a device (no text or symbols present)

D0000041894

Diagram showing three stages of a valve or connector assembly with labeled parts and directional arrows indicating process flow.

D0000041925

Technical line drawing of an electrical cabinet with internal components and a close-up view (no text or symbols)

D0000047341

Technical line drawing of a mechanical assembly with no visible text or symbols

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Technical diagram of an electrical cabinet with labeled components and directional arrows indicating assembly or connection.

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Mechanical assembly diagram showing two stages of a cylindrical component being inserted into a housing (no text or symbols present)

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Technical diagram of a mechanical assembly with no visible text or symbols

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Technical diagram of an electrical switchgear box with labeled components and a magnified inset showing part numbers 60 and 43.

D0000041912

Technical diagram of a refrigerator interior with labeled parts and directional arrows indicating movement or force

Diagram of a device with an open lid and internal components, showing no text or symbols.

D0000041981

Technical diagram of an electrical enclosure with labeled components and a magnified inset showing a 24-wattled component.

1 Diagnoseampel

D0000041794

Technical diagram showing two mechanical assembly steps with directional arrows indicating movement or force direction.

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1 2 3 4 L1' L2' L3' 1 2 3 4 2 3 P2

L L L 2 1

1. General information .... 19
2. Safety 19
3. Appliance description....20
4. Settings.....20
5. Cleaning, care and maintenance 20
6. Troubleshooting 20

INSTALLATION

1. Safety 21
2. Appliance description....21
3. Preparations....21
4. Installation....22
5. Commissioning....26
6. Shutting down....26
7. Troubleshooting 26
8. Maintenance....27
9. Specification 28

GUARANTEE

ENVIRONMENT AND RECYCLING

SPECIAL INFORMATION

- The appliance may be used by children aged 8 and up and persons with reduced physical, sensory or mental capabilities or a lack of experience and know-how, provided that they are supervised or they have been instructed on how to use the appliance safely and have understood the resulting risks. Children must never play with the appliance. Children must never clean the appliance or perform user maintenance unless they are supervised.

• Risk of scalding: The tap can reach temperatures in excess of 60 °C .
• Ensure the appliance can be separated from the power supply by an isolator that disconnects all poles with at least 3 mm contact separation.
• Secure the appliance as described in chapter "Installation / Installation".
• Observe the maximum permissible pressure (see chapter "Specification / Data table").
• Drain the appliance as described in chapter "Installation / Maintenance / Draining the appliance".

OPERATION

1. General information

The chapters "Special Information" and "Operation" are intended for both the user and qualified contractors.

The chapter "Installation" is intended for qualified contractors.

Note

Read these instructions carefully before using the appliance and retain them for future reference.

Pass on the instructions to a new user if required.

1.1 Safety instructions

1.1.1 Structure of safety instructions

KEYWORD Type of risk

Here, possible consequences are listed that may result from failure to observe the safety instructions.

» Steps to prevent the risk are listed.

1.1.2 Symbols, type of risk

Symbol Type of risk

	Injury
	Electrocution
	Burns(burns, scalding)

1.1.3 Keywords

KEYWORD	Meaning
DANGER	Failure to observe this information will result in serious injury or death.
WARNING	Failure to observe this information may result in serious injury or death.
CAUTION	Failure to observe this information may result in non-serious or minor injury.

1.2 Other symbols in this documentation

Note

General information is identified by the symbol shown on the left.

» Read these texts carefully.

Symbol Meaning
	Material losses(appliance damage, consequential losses and environmental pollution)
	Appliance disposal

» This symbol indicates that you have to do something. The action you need to take is described step by step.

1.3 Units of measurement

Note

All measurements are given in mm unless stated otherwise.

2. Safety

2.1 Intended use

This appliance is intended for domestic use. It can be used safely by untrained persons. The appliance can also be used in a non-domestic environment, e.g. in a small business, as long as it is used in the same way.

This pressurised appliance is suitable for heating domestic hot water or for reheating preheated water. The appliance can supply one or more draw-off points.

Any other use beyond that described shall be deemed inappropriate. Observation of these instructions and of instructions for any accessories used is also part of the correct use of this appliance.

2.2 General safety instructions

CAUTION Burns

During operation, the tap can reach temperatures in excess of 60 °C.

There is a risk of scalding at outlet temperatures in excess of 43 °C.

CAUTION Burns

If operating with preheated water, e.g. from a solar thermal system, the DHW temperature may vary from the selected set temperature.

WARNING Injury

The appliance may be used by children aged 8 and up and persons with reduced physical, sensory or mental capabilities or a lack of experience and know-how, provided that they are supervised or they have been instructed on how to use the appliance safely and have understood the resulting risks. Children must never play with the appliance. Children must never clean the appliance or perform user maintenance unless they are supervised.

Where children or persons with limited physical, sensory or mental abilities are allowed to use this appliance, we recommend a permanent temperature limit. A qualified contractor can set the limit for you.

Material losses

Protect the appliance and its tap against frost.

2.3 CE designation

The CE designation shows that the appliance meets all essential requirements according to the:

Low Voltage Directive

Electromagnetic Compatibility Directive The maximum permissible mains impedance is indicated in chapter "Specification".

2.4 Test symbols

See type plate on the appliance.

Country-specific approvals and certifications: Germany

A general test certificate as verification of suitability regarding noise emissions has been issued for this appliance, based on the State Building Regulations [Germany].

AEG HOL DIN 4109 PA-IX 6814/I MPA NRW.

3. Appliance description

The electronically controlled instantaneous water heater with automatic output matching keeps the outlet temperature constant up to the output limit. The temperature is then selected via the draw-off tap.

Heating system

The bare wire heating system has a pressure-tested plastic casing. The heating system is suitable for hard and soft water areas; it has low susceptibility to scale build-up. This system ensures rapid and efficient DHW availability.

Note

The appliance is equipped with an air detector that largely prevents damage to the heating system. If, during operation, air is drawn into the appliance, the appliance shuts down for one minute, thereby protecting the heating system.

4. Settings

The DHW outlet temperature can be variably adjusted. The selected temperature is displayed. At temperatures over 43 °C, the colour of the display changes from blue to red to indicate a risk of scalding.

» Turn the temperature selector to the required temperature.

D0000041982

Note

If the outlet temperature is not sufficiently high when the draw-off valve is fully open and the temperature selector is set to maximum, then more water is flowing through the appliance than can be heated by the heating system (appliance is at its output limit).

» Reduce the water volume at the draw-off valve.

Recommended setting for operation with a thermostatic valve

Set the temperature at the appliance to the maximum temperature.

Following an interruption of the water supply

Material losses

Following an interruption of the water supply the appliance must be recommissioned by carrying out the following steps, in order to prevent the destruction of the bare wire heating system.

» Disconnect the appliance from the power supply by removing the fuses/tripping the MCBs.
» Open the tap for one minute until the appliance and its upstream cold water inlet line are free of air.
» Switch the mains power back ON again.

5. Cleaning, care and maintenance

» Never use abrasive or corrosive cleaning agents. A damp cloth is sufficient for cleaning the appliance.
» Check the taps regularly. Limescale deposits at the spouts can be removed using commercially available descaling agents.

6. Troubleshooting

Problem Cause Remedy
The appliance will not start despite the DHW valve being fully open.	There is no power. Check the fuses/ MCBs in your fuse box/distribution panel.
	The flow rate is too low. The aerator in the tap or the shower head is scaled up or contaminated.	Clean and/or descale the aerator or shower head.
Required temperature >45 °C is not achieved.	The water supply has been interrupted.	Vent the appliance and the cold water inlet line (see chapter "Settings").
The cold water	inlet temperature is >45 °C.	Reduce the cold water inlet temperature.

If you cannot remedy the fault, notify your qualified contractor. To facilitate and speed up your enquiry, please provide the serial number from the type plate (000000-0000-00000):

Nr.: 000000-0000-00000

D0000041614

INSTALLATION

7. Safety

Only a qualified contractor should carry out installation, commissioning, maintenance and repair of the appliance.

7.1 General safety instructions

We guarantee trouble-free function and operational reliability only if original accessories and spare parts intended for the appliance are used.

Material losses

Observe the maximum inlet temperature. Higher temperatures may damage the appliance. You can limit the maximum inlet temperature by installing a central thermostatic valve.

7.2 Instructions, standards and regulations

Note

Observe all applicable national and regional regulations and instructions.

• The protection rating IP 25 (hoseproof) can only be ensured with a correctly fitted cable grommet.
- The specific electrical resistance of the water must not fall below that stated on the type plate. In a linked water network, observe the lowest electrical water resistance (see chapter "Specification / Application areas / Conversion table"). Your water supply utility will advise you of the specific electrical water resistance or conductivity.

8. Appliance description

8.1 Standard delivery

The following are delivered with the appliance:

• Wall mounting bracket
• Threaded studs, screws and rawl plugs for the wall mounting bracket
  • Installation template
• 2 twin connectors (cold water with shut-off valve)
• Flat gaskets
  • Cable grommet (power cable from above/below)
• Screws/rawl plugs for fixing the back panel in the case of water connection on finished walls

8.2 Accessories

Tap

ADEo 70 WD bath pressure tap

Installation accessories

Pipe assembly, undersink installation UT 104, connections: Finished walls, G 3/8, top. Water connections with 12 mm compression fittings.

Universal mounting frame

Mounting frame with electrical connections.

Pipe assembly for undersink appliances

This assembly for undersink installation is required if you need to have the water connections (G 38 A) above the appliance.

Pipe assembly for offset installation

This pipe assembly with pipe bends is required if you need to have the appliance vertically offset against the water connection by approx. 90 mm downwards.

Pipe assembly for replacing a gas water heater

This pipe assembly is required if the installation has existing gas water heater connections (cold water connection on the left and DHW connection on the right).

Load shedding relay (LR 1-A)

The load shedding relay for installation in the distribution board provides priority control for the instantaneous water heater when other appliances, such as electric storage heaters, are simultaneously being operated.

ZTA 3/4 - central thermostatic valve

Thermostatic valve for central premixing, for example for an instantaneous water heater with a solar thermal system.

9. Preparations

9.1 Installation site

Material losses

Install the appliance in a room free from the risk of frost.

» Always install the appliance vertically near the draw-off point.

The appliance is suitable for undersink and oversink installations.

Undersink installation

Technical diagram of a water purifier system with labeled components and flow indicators

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Oversink installation

Technical diagram showing a mechanical or fluid system with labeled components 1, 2, and directional arrows indicating flow or movement.

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1 Cold water inlet

2 DHW outlet

Note

» Mount the appliance on the wall. The wall must have a sufficient load-bearing capacity.

9.2 Water installation

• A safety valve is not required.
  » Flush the water line thoroughly.
  » Ensure that the flow rate (see chapter "Specification / Data table", On) for switching on the appliance is achieved. If the flow rate is not achieved, remove the flow limiter (see chapter "Installation / Removing the flow limiter").
  » Increase the mains water pressure if the required flow rate is not achieved with the draw-off valve fully opened.

Taps

Use appropriate pressure taps. Open taps are not permitted.

Note

Never use the shut-off valve in the cold water inlet to reduce the flow rate. It is intended to shut off the appliance.

Permissible water pipe materials

• Cold water inlet pipe:
  Galvanised steel pipe, stainless steel pipe, copper pipe or plastic pipe
• DHW outlet pipe:
  Stainless steel pipe, copper pipe or plastic pipe

Material losses

If plastic pipework systems are used, take into account the maximum inlet temperature and the maximum pressure (see chapter "Specification / Data table").

Flexible water connection lines

» If the appliance is installed with flexible water connection lines, ensure that the bayonet fittings of the pipe bends do not become twisted inside the appliance.
» Secure the back panel at the bottom with two additional screws.

10. Installation

10.1 Standard installation

• Electrical connection from above; installation on unfinished walls
  • Water connection, installation on unfinished walls
• DDLE LCD 18/21/24: Connected load 21 kW preset
  For further installation options, see chapter "Installation alternatives":
  • Electrical connection from below on unfinished walls
• Electrical connection for finished walls
• Connecting a load shedding relay
• Undersink installation, water connections – from above
  • Water installation for finished walls
  • Operation with preheated water
• Temperature limit

Opening the appliance

Technical line drawing of a door panel with two views showing internal components and directional arrows (no text or symbols)

» Open the appliance by releasing the snap lock.

Technical diagram of a mechanical assembly with two views (top and side), showing internal components and directional arrows (no text or symbols)

» Remove the back panel by pressing the two locking hooks and pulling the lower part of the back panel forwards.

Preparing the power cable

160 ≥ 30 26 02 02 0887

Fitting the wall mounting bracket

Technical diagram of a mechanical assembly with mounting holes and a rod, shown without any text or symbols.

» Mark out the holes for drilling with the installation template. If the appliance is to be installed with water connections on finished walls, also mark out the fixing holes on the lower part of the template.
» Drill the holes and secure the wall mounting bracket with 2 screws and 2 rawl plugs (screws and rawl plugs are part of the standard delivery).
» Fit the threaded stud provided.
» Mount the wall mounting bracket.

Fitting the cable grommet

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» Fit the cable grommet. In the case of a connecting cable > 6 mm ^2 , enlarge the hole in the cable grommet.

Making the water connection

Material losses

Carry out all water connection and installation work in accordance with regulations.

Technical diagram showing mechanical assembly with labeled parts and directional arrows, including a numbered reference.

» Seal and insert the twin connectors.

Material losses

Never use the shut-off valve in the cold water inlet to reduce the flow rate.

Preparing the back panel

Material losses

If you break out the wrong knock-out by mistake, you should use a new back panel.

Technical line drawing of an industrial machine interior with no visible text or symbols

» Break out the cable grommet knock-out in the back panel. Deburr the sharp edges with a file if necessary.

Installing the appliance

Technical line drawing of an electrical enclosure with internal components and a magnified inset showing a device (no text or symbols present)

D0000041894

» Push the back panel over the threaded stud and the cable grommet. Pull the cable grommet by the locking hooks into the back panel using pliers, until both locking hooks audibly click into place.
» Remove the transport plugs from the water connections.
» Press the back panel firmly into place and lock the fixing toggle by turning it clockwise through 90°.

Diagram illustrating three stages of a mechanical or electrical component connection, with arrows indicating direction of movement.

D0000041925

» Screw the water connection pipes with flat gaskets on to the twin connectors.

Material losses

The strainer must be fitted for the appliance to function.

» When replacing an appliance, check whether the strainer is installed (see chapter "Maintenance").

Removing/replacing the flow limiter

Note

If you use a thermostatic valve, the flow limiter must not be removed.

90° 1 2

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1 Plastic profile washer
2 Flow limiter

» Remove the flow limiter and refit the plastic profile washer.

DDLE LCD 18/21/24: Replacing the flow limiter

» If 24 kW connected load has been selected, replace the fitted flow limiter (white) with the flow limiter supplied (orange, fixed to the cold water pipe).

Making the electrical connection

WARNING Electrocution

Carry out all electrical connection and installation work in accordance with relevant regulations.

WARNING Electrocution

Connection to the power supply is only permissible in the form of a permanent connection in conjunction with the removable cable grommet. Ensure the appliance can be separated from the power supply by an isolator that disconnects all poles with at least 3 mm contact separation.

WARNING Electrocution

Ensure that the appliance is earthed.

Material losses

Observe the type plate. The specified voltage must match the mains voltage.

» Connect the power cable to the mains terminal (see chapter "Specification / Wiring diagram").

DDLE LCD 18/21/24: Re-plugging the coding card

In its delivered condition, the appliance is plugged to 21 kW. When changing to a different connected load, carry out the following steps:

Technical line drawing of an electrical cabinet with internal components and a close-up view of the interior panel (no text or symbols)

D0000047341

» Re-plug the coding card according to the selected connected load (for selectable connected load and fuse protection of the appliance, see "Specification / Data table").

» Tick the selected connected load on the type plate. Please use a ballpoint pen to do this.

Fitting lower section of back panel

Technical line drawing of a mechanical assembly with no visible text or symbols

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» Fit the lower part of the back panel into the back panel and click into place.
» Align the mounted appliance by loosening the fixing toggle, aligning the power supply and back panel, and then re-tightening the fixing toggle. If the back panel of the appliance is not flush, the appliance can be secured at the bottom with two additional screws.

10.2 Alternative installation methods

10.2.1 Electrical connection from below on unfinished walls

Technical diagram of a mechanical or electrical device with labeled components and directional arrows indicating flow or movement.

26 02 02 0767

» Fit the cable grommet.

Material losses If you break out the wrong knock-out by mistake, you should use a new back panel.

» Break out the cable grommet knock-out in the back panel. Deburr the sharp edges with a file if necessary.

» Reposition the mains terminal in the appliance from the top to the bottom.
» Push the back panel over the threaded stud and the cable grommet. Pull the cable grommet by the locking hooks into the back panel using pliers, until both locking hooks audibly click into place.
» Press the back panel firmly into place and lock the fixing toggle by turning it clockwise through 90°.

10.2.2 Electrical connection for finished walls

Note

This type of connection changes the protection rating of the appliance.

» Change the type plate. Cross out "IP 25" and mark the box "IP 24". Please use a ballpoint pen to do this.

Material losses

If you break out the wrong knock-out by mistake, you should use a new back panel.

» Cut or break out the required entries in the back panel cleanly (for positions, see chapter "Specification / Dimensions and connections"). Deburr the sharp edges with a file if necessary.
» Route the power cable through the cable grommet and connect it to the mains terminal.

10.2.3 Connecting a load shedding relay

Install a load shedding relay in the distribution board in conjunction with other electric appliances, e.g. electric storage heaters. The relay responds when the instantaneous water heater starts.

Material losses

Connect the phase that switches the load shedding relay to the indicated terminal of the mains terminal in the appliance (see chapter "Specification / Wiring diagram").

10.2.4 Undersink installation, water connections – from above

An undersink installation with water connections from above can be achieved with the additional pipe assembly for undersink appliances. Cleanly break out the water pipe knock-outs in the back panel and fit the pipe set.

10.2.5 Water installation for finished walls

Note

This type of connection changes the protection rating of the appliance.

» Change the type plate. Cross out "IP 25" and mark the box "IP 24". Please use a ballpoint pen to do this.

Two-step diagram showing a mechanical assembly with a cylindrical component and two circular components, no text or symbols present.

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» Fit water plugs with gaskets to seal the connection on unfinished walls.

» Fit a suitable pressure tap.

Technical diagram of a mechanical assembly with no visible text or symbols

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» Click the lower part of the back panel into place in the upper part of the back panel.
» Secure the connection pipes to the appliance.
» Secure the back panel at the bottom with two additional screws.

Material losses

If you break out the wrong knock-out by mistake, you should use a new back panel.

» Cleanly break out the knock-outs in the appliance cover. Deburr the sharp edges with a file if necessary.
» Push the lower part of the back panel under the connection pipes of the tap and click the lower part of the back panel into place.
» Secure the connection pipes to the appliance.

10.2.6 Operation with preheated water

You can limit the maximum inlet temperature by installing a central thermostatic valve.

10.2.7 Temperature limit

CAUTION Burns

If operating with preheated water, the set temperature limit and anti-scalding protection may be ineffective.

» In this case, limit the temperature with an upstream central thermostatic valve.

You can set the temperature limit inside the appliance cover to 43 °C.

Technical diagram of an electrical switchgear with labeled components and a magnified inset showing part numbers 60 and 43.

D0000041912

» Switch the temperature limit to 43 °C.

After enabling the temperature limit, you can only select temperatures between 30 and 43 °C.

10.3 Completing the installation

» Open the shut-off valve in the twin connector or the cold water inlet line.

11. Commissioning

WARNING Electrocution

Commissioning may only be carried out by a qualified contractor in accordance with safety regulations.

11.1 Initial start-up

Technical diagram of a mechanical device with labeled components and an inset showing a close-up view of a component with '24kW' and 'Tak'.

Diagram of a device with an open lid and internal components, showing no text or symbols.

D0000041981

» Open and close all connected draw-off valves several times, until all air has been vented from the pipe-work and the appliance.
» Carry out a tightness check.
» Enable the safety pressure limiter by firmly pressing the reset button (the appliance is delivered with the safety pressure limiter disabled).
» Plug the temperature selector cable plug into the PCB.
» Fit the appliance cover, ensuring it clicks into place. Check that the appliance cover is seated correctly.
» Switch the mains power ON.
» Check the function of the appliance.

Appliance handover

» Explain the appliance function to users and familiarise them with its operation.
» Make users aware of potential dangers, especially the risk of scalding.
» Hand over these instructions.

11.2 Recommissioning

Vent the appliance and the cold water inlet line (see chapter "Settings").

See chapter "Initial start-up".

12. Shutting down

» Isolate all poles of the appliance from the power supply.
» Drain the appliance (see chapter "Maintenance").

13. Troubleshooting

WARNING Electrocution
To test the appliance, it must be supplied with power.

Possible indications of diagnostic traffic light (LED)

	Red Illuminates in the event of a fault
	Yellow Illuminates during heating mode
	Green Flashing: Appliance is supplied with mains power

Technical diagram of an electrical enclosure with labeled components and a magnified inset showing internal wiring connections.

1 Diagnostic traffic light

Fault / diagnostic traffic light LED display	Cause Remedy
Inadequate flow rate. The strainer in the	appliance is dirty. Clean the strainer.
The set temperature is not achieved.	One phase down.	Check the fuses/MCBs in your fuse box/distribution panel.
The heater does not switch on. Air is de	ected in the water and heating output is briefly switched off.	The appliance restarts after one minute.
No hot water and no traffic light display.	The MCB/fuse has responded/blown.	Check the fuses/MCBs in your fuse box/distribution panel.
The safety pressure limiter has tripped.	Remove the cause of the fault (e.g. faulty pressure	washer).
		Protect the heating system against overheating by opening a draw-off valve downstream of the appli-ance for one minute. This depressurises and cools down the heating system.
		Enable the safety pressure limiter at flow pressure by pressing the reset button (see chapter "Commis-sioning").
The PCB is faulty. Check the PCB and	replace if required.
Traffic light display: Green flashing or constantly ON	The PCB is faulty. Check the PCB and replace if required.
No hot water at a flow rate of >2.5 l/min.	The flow meter DFE is not plugged in. Plug the flow meter plug back in.
The flow meter plug is faulty.	Check the flow meter and replace it if required.
Traffic light display: Steady yellow light, flashing green light No hot water at flow rate >2.5 l/min.	The high limit safety cut-out has responded or its lead is broken.	Check the high limit safety cut-out and replace it if required.
The heating system is faulty.	Check the heating system resistor, and replace it if required.
The PCB is faulty. Check the PCB and	replace if required.
Traffic light display: Yellow constantly on; green flashing	The outlet sensor is unplugged or the lead is bro-ken.	Plug in the outlet sensor or replace it if required.
Traffic light display: Red constantly on; green flashing	The cold water sensor is faulty.	Check the PCB and replace if required.
No hot water Accurate temperature delivery >45 °C is not reached.	The cold water inlet temperature exceeds 45 °C.	Reduce the cold water inlet temperature to the ap- pliance.
Traffic light display: Red constantly on; green flashing	The outlet sensor is faulty (short circuit).	Check the outlet sensor and replace it if required.

14. Maintenance

WARNING Electrocution Before any work on the appliance, disconnect all poles from the power supply.

Draining the appliance

You can drain the appliance for maintenance work or to protect it from frost.

WARNING Burns Hot water may escape when draining the appliance.

» Close the shut-off valve in the twin connector or the cold water inlet line.
» Open all draw-off valves.
» Undo the water connections on the appliance.
» Store the dismantled appliance in a room free from the risk of frost, as water residues remaining inside the appliance can freeze and cause damage.

Cleaning the strainer

Diagram of two mechanical components with arrows indicating motion, showing pipe connection and assembly (no text or symbols)

26_02_02_0949

If dirty, clean the strainer in the cold water threaded fitting. Close the shut-off valve in the cold water inlet line before removing, cleaning and refitting the strainer.

15. Specification

15.1 Dimensions and connections

226 190 b02 35 485 395 325 45 100 c06 c01 190 93 50 112 D0000017757

b02 Entry electrical cables I
c01 Cold water inlet Male thread G 1/2 A
c06 DHW outlet Male thread G 1/2 A

Alternative connection options

b04 35 b02 b03 40 b04 50 325 b04 50

D0000019778

b02	Entry electrical cables I
b03	Entry electrical cables II
b04	Entry electrical cables III

15.2 Wiring diagram

3/PE \~ 380-415 V

1 2 3 4 L1' L2' L3' 1 2 3 4 2 3 P2 L L L

1 Heater
2 High limit safety cut-out
3 Safety pressure limiter

Load shedding relay LR 1-A

L L L 2 1

1 Control cable to the contactor of the second appliance (e.g. electric storage heater).
2 Control contact opens when switching the instantaneous water heater on.

15.3 DHW output

DHW output is subject to the mains voltage, the appliance's connected load and the cold water inlet temperature. The rated voltage and rated output can be found on the type plate (see chapter "Troubleshooting").

Specific electrical resistance and specific electrical conductivity (see chapter "Data table").

Standard specification at 15 °C			20 °C			25 °C
Resistance ρ	Conductivity σ		Resistance ρ	Conductivity σ		Resistance ρ	Conductivity σ
Ωcm	mS/m	μS/cm	Ωcm	mS/m	μS/cm	Ωcm	mS/m	μS/cm
900	111	1111	800	125	1250	735	136	1361
1000	100	1000	890	112	1124	815	123	1227
1100	91	909	970	103	1031	895	112	1117
1200	83	833	1070	93	935	985	102	1015
1300	77	769	1175	85	851	1072	93	933

15.5 Pressure drop

Taps

Pressure drop at taps at flow rate of 10 l/min
Mono lever mixer tap, approx.	MPa	0,04 - 0,08
Thermostatic valve, approx.	MPa	0,03 - 0,05
Hand shower, approx.	MPa	0,03 - 0,15

Sizing the pipework

When calculating the size of the pipework, a pressure drop for the appliance of 0.1 MPa is recommended.

15.6 Fault conditions

In case of faults, loads up to a maximum of 95 °C at a pressure of 1.2 MPa can occur temporarily in the installation.

15.7 Details on energy consumption

Product data complies with EU regulations relating to the Directive on the ecodesign of energy related products (ErP).

		DDLE LCD 18	DDLE LCD 18/21/24	DDLE LCD 27
		222392	222394	222395
Manufacturer		AEG Haustechnik	AEG Haustechnik	AEG Haustechnik
Load profile		S	S	S
Energy efficiency category		A	A	A
Annual power consumption	kWh	477	477	481
Energy conversion efficiency	%	39	39	39
Default temperature setting	°C	60	60	60
Sound power level	dB(A)	15	15	15
Special information on measuring efficiency		None	Information at Pmax.	None

15.8 Data table

DDLE LCD 18 DDLE LCD 18/21/24 DDLE LCD 27
222392 222394 222395
Electrical data
Rated voltage	V	380	400	415	380	400	415	380	400
Rated output	kW	16.2	18	19.4	16.2/19/21.7	18/21/24	19.4/22.6/25.8	24.4	27
Rated current	A	24.7	26	27	27.6/29.5/33.3	29/31/35	30.1/32.2/36.3	37.1	39
MCB/fuse rating	A	25	25	32	32/32/35	32/32/35	32/32/35	40	40
Phases		3/PE			3/PE			3/PE
Frequency	Hz	50/60	50/60	50/-	50/60	50/60	50/-	50/60	50/60
Specific resistance _15 ≥ (at _cold≤ 25 ^)	Ω cm	900	900	1000	900	900	1000	900	900
Specific conductivity _15 ≤ (at _cold≤ 25 ^)	μS/cm	1111	1111	1000	1111	1111	1000	1111	1111
Specific resistance _15 ≥ (at _cold≤ 45 ^)	Ω cm	1200	1200	1300	1200	1200	1300	1200	1200
Specific conductivity _15 ≤ (at _cold≤ 45 ^)	μS/cm	830	830	770	830	830	770	830	830
Max. mains impedance at 50 Hz	Ω	0.379	0.360	0.347	0.284	0.270	0.260	0.254	0.241
Application limits
Max. permissible pressure	MPa	1			1			1
Max. inlet temperature for reheating	°C	45			45			45
Values
Max. permissible inlet temperature	°C	65			65			65
On	l/min	>2.5			>2.5			>2.5
Flow rate limit at	l/min	8			8 / 8 / 9			9
DHW delivery	l/min	9.4			9.4/11.0/12.6			14.2
on delivery	K	26			26			26
Hydraulic data
Nominal capacity	I	0.4			0.4			0.4
Versions
Temperature setting range	°C	30-60			30-60			30-60
Heating system heat generator		Bare wire			Bare wire			Bare wire
Colour		white			white			white
IP rating		IP25			IP25			IP25
Dimensions
Height	mm	485			485			485
Width	mm	226			226			226
Depth	mm	93			93			93
Weights
Weight	kg	3.6			3.6			3.6

Guarantee

The warranty conditions of our German companies do not apply to appliances acquired outside of Germany. In countries where our subsidiaries sell our products, it is increasingly the case that warranties can only be issued by those subsidiaries. Such warranties are only granted if the subsidiary has issued its own terms of warranty. No other warranty will be granted.

We shall not provide any warranty for appliances acquired in countries where we have no subsidiary to sell our products. This will not affect warranties issued by any importers.

Environment and recycling

We would ask you to help protect the environment. After use, dispose of the various materials in accordance with national regulations.

REMARQUES PARTICULIÈRES

UTILISATION

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1 Voyants de diagnostic

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1 2 3 4 L1' L2' L3' 1 2 3 4 2 3 P2

85_02_02_0005

L L L 2 1 1>

85_02_02_0003_

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26_02_02_1345

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Info

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» Dicht af en schroef de nippel erin.

Materièle schade

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26 02 02 0765

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D0000041912

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1 2 3 4 L1' L2' L3' L L L P

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26 02 02 1344

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D0000041894

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D0000041925

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26_02_02_1348

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26_02_02_0765

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26_02_02_1006

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D0000041912

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on

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26_02_02_0949

1 2 3 4 L1' L2' L3' P> 3

85_02_02_0005

L L L 2 1 I>

85_02_02_0003_

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26_02_02_1348

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26_02_02_0949

L L L 2 1

85_02_02_0003_

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26_02_02_0972

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26_02_02_0950

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26_02_02_0948

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D0000041893

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D0000041894

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26_02_02_0765
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Urzhumskaya street 4,

building 2

129343 Moscow

Tel. [phone]

Fax [phone]

Switzerland

STIEBEL ELTRON AG

Industrie West

Gass 8

5242 Lupfig

Tel. [phone]

Fax [phone]