Q: Which indoor units are compatible with the outdoor unit 4MXS80E?

The outdoor unit 4MXS80E is a high-performance multi-split air conditioning system compatible with four types of Daikin indoor units . This configuration flexibility allows the system to be adapted to different areas and thermal needs. The compatible indoor units are: FTXJ-M : standard wall-mounted unit, compact and discreet FTXM-M : high-performance wall-mounted unit with advanced features FTXP-KV : high-end wall-mounted unit with integrated display and controls FDXM-F : ceiling-mounted cassette unit, suitable for false ceilings This outdoor unit 4MXS80E can be paired with one, two, three, or four maximum indoor units of these compatible models (in multi-split configuration), depending on your air conditioning needs. This configuration allows for cooling or heating multiple rooms independently with a single outdoor unit. The system operates with the R32 refrigerant (eco-friendly and efficient) and features a variable speed inverter compressor that automatically adjusts its power to real needs, ensuring significant energy savings. The system offers four operating modes : cooling, heating, dehumidification, and simple ventilation. The power supply for the system is single-phase 220-240 V ~ 50 Hz . The integrated 4-way valve in the outdoor unit allows for automatic switching between cooling and heating modes. Before installation, be sure to consult the installation guide provided to check the thermodynamic compatibility between the outdoor unit and all the indoor units you wish to install, as some capacity combinations may be subject to configuration restrictions.

Q: What does the Input overcurrent error (H8-00) mean on the DAIKIN 5MXM90M/5MXS90E and how can it be resolved?

Input overcurrent (error code H8-00 ) means that an anomaly has been detected on the direct current (DC) sensor of the outdoor unit, based on the compressor's operating frequency and the actual input current. Possible causes Faulty outdoor inverter PCB - Check the service LEDs (LED1-LED5): a flashing green light indicates normal operation, while red patterns identify specific issues. Defective compressor - May generate abnormal input current. Faulty reactor - A critical component in current management. Refrigerant issue - Lack of refrigerant, moisture, or presence of non-condensables. Current sensor or thermistor fault - Check the thermistors (outdoor air temperature and discharge pipe). How to reset Automatic reset: The unit automatically resets after 60 minutes of normal compressor operation. Via remote control: Press the ON/OFF button after resolving the issue. Power cut reset: Cut the power supply to the outdoor unit for at least 60 seconds, then restore it. PCB reset: Operate the SW3 switch (wiring error check) on the outdoor PCB and observe the diagnostic LEDs. If the error reappears regularly, we recommend contacting a certified DAIKIN service technician, as this anomaly involves critical electronic components (inverter PCB, reactor, current detection circuit).

Q: What does the error code NOP mean on the Zanotti Monoblock BSB0870Y1AA?

The error code NOP does not appear in the official documentation for the Zanotti Monoblock BSB0870Y1AA. According to the technical manual (section 12.4), the electronic controller of this model can display the following alarm codes: HA (high temperature), LA (low temperature), P1 (ambient probe failure), P2 (evaporator probe failure), dA (door open), PrE (pressure alarm), PAL (more than 10 pressure switch interventions in one hour), and bAL (voltage monitor). If your unit's display shows NOP , it means that the code is not recognized by the standard documentation for the model. This may indicate an internal fault in the electronic controller or a malfunction in the device's communication system. To resolve this issue, here are the recommended steps: Carefully note the code displayed on the control panel and any associated messages Check the recent history of the machine: have you noticed temperature variations, a poorly closed door, or electrical fluctuations? Perform a restart: cut off the power supply for about 10 seconds, then restore power If the code persists after the restart, immediately contact an authorized Daikin/Zanotti technician who has the specific diagnostic tools to read and interpret the complete code Do not attempt to force the operation of the unit if this code persists. A professional technical diagnosis is necessary to identify the exact cause and avoid damaging the refrigeration system.

Q: How to change the temperature unit (Celsius/Fahrenheit) on the DAIKIN FWEC2 air conditioner?

The DAIKIN FWEC2 air conditioner is an advanced LCD controller for terminal units , designed for professional air conditioning installations (two or four pipe systems with fan coil units). Unlike a standard wall-mounted air conditioner with a remote control, this system is typically installed and configured by a professional. According to the official technical documentation for the FWEC2, this controller does not offer the functionality to change the temperature unit between Celsius and Fahrenheit . The device consistently displays temperatures in Celsius (°C) , as indicated in the installation and operating manual. The configurable temperature ranges are also expressed only in Celsius: heating [5.0-30.0 °C] and cooling [10.0-35.0 °C]. If you need the temperatures to be displayed in Fahrenheit, here are your options: Contact a certified Daikin installer who can check if your model has a software version that allows this conversion Set up a manual conversion using the formula: °F = (°C × 1.8) + 32. For example, a temperature of 22 °C is approximately 72 °F Consult Daikin technical support to learn about the advanced configuration options available for your specific installation The FWEC2 is designed to be programmed and maintained by HVAC professionals (heating, ventilation, air conditioning). Any significant changes to the configuration should be made by a qualified person with access to the controller parameter setup procedure.

Question 1

Which indoor units are compatible with the outdoor unit 4MXS80E?

Accepted Answer

The outdoor unit 4MXS80E is a high-performance multi-split air conditioning system compatible with four types of Daikin indoor units. This configuration flexibility allows the system to be adapted to different areas and thermal needs.

The compatible indoor units are:

FTXJ-M: standard wall-mounted unit, compact and discreet
FTXM-M: high-performance wall-mounted unit with advanced features
FTXP-KV: high-end wall-mounted unit with integrated display and controls
FDXM-F: ceiling-mounted cassette unit, suitable for false ceilings

This outdoor unit 4MXS80E can be paired with one, two, three, or four maximum indoor units of these compatible models (in multi-split configuration), depending on your air conditioning needs. This configuration allows for cooling or heating multiple rooms independently with a single outdoor unit.

The system operates with the R32 refrigerant (eco-friendly and efficient) and features a variable speed inverter compressor that automatically adjusts its power to real needs, ensuring significant energy savings. The system offers four operating modes: cooling, heating, dehumidification, and simple ventilation.

The power supply for the system is single-phase 220-240 V ~ 50 Hz. The integrated 4-way valve in the outdoor unit allows for automatic switching between cooling and heating modes. Before installation, be sure to consult the installation guide provided to check the thermodynamic compatibility between the outdoor unit and all the indoor units you wish to install, as some capacity combinations may be subject to configuration restrictions.

Question 2

What does the Input overcurrent error (H8-00) mean on the DAIKIN 5MXM90M/5MXS90E and how can it be resolved?

Accepted Answer

Input overcurrent (error code H8-00) means that an anomaly has been detected on the direct current (DC) sensor of the outdoor unit, based on the compressor's operating frequency and the actual input current.

Possible causes

Faulty outdoor inverter PCB - Check the service LEDs (LED1-LED5): a flashing green light indicates normal operation, while red patterns identify specific issues.
Defective compressor - May generate abnormal input current.
Faulty reactor - A critical component in current management.
Refrigerant issue - Lack of refrigerant, moisture, or presence of non-condensables.
Current sensor or thermistor fault - Check the thermistors (outdoor air temperature and discharge pipe).

How to reset

Automatic reset: The unit automatically resets after 60 minutes of normal compressor operation.
Via remote control: Press the ON/OFF button after resolving the issue.
Power cut reset: Cut the power supply to the outdoor unit for at least 60 seconds, then restore it.
PCB reset: Operate the SW3 switch (wiring error check) on the outdoor PCB and observe the diagnostic LEDs.

If the error reappears regularly, we recommend contacting a certified DAIKIN service technician, as this anomaly involves critical electronic components (inverter PCB, reactor, current detection circuit).

Question 3

What does the error code NOP mean on the Zanotti Monoblock BSB0870Y1AA?

Accepted Answer

The error code NOP does not appear in the official documentation for the Zanotti Monoblock BSB0870Y1AA. According to the technical manual (section 12.4), the electronic controller of this model can display the following alarm codes: HA (high temperature), LA (low temperature), P1 (ambient probe failure), P2 (evaporator probe failure), dA (door open), PrE (pressure alarm), PAL (more than 10 pressure switch interventions in one hour), and bAL (voltage monitor).

If your unit's display shows NOP, it means that the code is not recognized by the standard documentation for the model. This may indicate an internal fault in the electronic controller or a malfunction in the device's communication system.

To resolve this issue, here are the recommended steps:

Carefully note the code displayed on the control panel and any associated messages
Check the recent history of the machine: have you noticed temperature variations, a poorly closed door, or electrical fluctuations?
Perform a restart: cut off the power supply for about 10 seconds, then restore power
If the code persists after the restart, immediately contact an authorized Daikin/Zanotti technician who has the specific diagnostic tools to read and interpret the complete code

Do not attempt to force the operation of the unit if this code persists. A professional technical diagnosis is necessary to identify the exact cause and avoid damaging the refrigeration system.

Question 4

How to change the temperature unit (Celsius/Fahrenheit) on the DAIKIN FWEC2 air conditioner?

Accepted Answer

The DAIKIN FWEC2 air conditioner is an advanced LCD controller for terminal units, designed for professional air conditioning installations (two or four pipe systems with fan coil units). Unlike a standard wall-mounted air conditioner with a remote control, this system is typically installed and configured by a professional.

According to the official technical documentation for the FWEC2, this controller does not offer the functionality to change the temperature unit between Celsius and Fahrenheit. The device consistently displays temperatures in Celsius (°C), as indicated in the installation and operating manual. The configurable temperature ranges are also expressed only in Celsius: heating [5.0-30.0 °C] and cooling [10.0-35.0 °C].

If you need the temperatures to be displayed in Fahrenheit, here are your options:

Contact a certified Daikin installer who can check if your model has a software version that allows this conversion
Set up a manual conversion using the formula: °F = (°C × 1.8) + 32. For example, a temperature of 22 °C is approximately 72 °F
Consult Daikin technical support to learn about the advanced configuration options available for your specific installation

The FWEC2 is designed to be programmed and maintained by HVAC professionals (heating, ventilation, air conditioning). Any significant changes to the configuration should be made by a qualified person with access to the controller parameter setup procedure.

Question 5

How to program the DAIKIN EKHHE260PCV37 boiler?

Accepted Answer

To program your DAIKIN EKHHE260PCV37 boiler, follow these simple steps:

1. Setting the clock

Make sure the buttons are unlocked.
Press and hold the OK button for 3 seconds until the clock symbol blinks.
Set the hour using the “ + ” and “ − ” buttons, then confirm with OK.
Do the same for the minutes, then press OK to exit the clock setting.

2. Programming operating time slots

Press OK and “ − ” simultaneously for 3 seconds to access programming mode.
Set the ignition time using “ + ” and “ − ”, then confirm with OK.
Set the ignition minutes, confirm.
Set the shutdown time, confirm.
Select the desired operating mode from: ECO, AUTOMATIC, BOOST, ELECTRIC or VENTILATION, then confirm.
Press OK to save and exit.

3. Setting the target temperature

Select the operating mode with the OK button.
Adjust the temperature using the “ + ” and “ − ” buttons.
The available temperature ranges are:
- 43 to 62°C in ECO and AUTOMATIC modes
- 43 to 75°C in BOOST and ELECTRIC modes

4. Disabling time slots

To disable the time programming, set the ignition and shutdown times to 00:00.
Confirm and press OK and “ − ” simultaneously for 3 seconds to validate.

This procedure will allow you to effectively configure the schedules and temperature of your DAIKIN EKHHE260PCV37 boiler for optimal operation.

Question 6

Why does my Daikin FTXS25K wall-mounted air conditioner only blow ambient temperature air and go into safety mode?

Accepted Answer

If your Daikin FTXS25K wall-mounted air conditioner only blows ambient temperature air and goes into safety mode, it indicates that the system has activated a thermal or pressure protection to prevent damage to the compressor. The problem usually originates from the indoor unit, the outdoor unit, or the refrigerant circuit.

Issues related to the indoor unit:

Clogged filter: A dirty air filter drastically reduces airflow, causing a drop in evaporation temperature and potentially freezing the evaporator. The unit then triggers thermal protection. Clean or replace the filters regularly (every 2 to 4 weeks depending on usage).
Incorrect mode setting: Ensure that the "Cooling" mode is selected on the remote control, not "Fan" or "Dehumidification". Also, make sure that the set temperature is lower than the current ambient temperature.
Frozen evaporator: If thermal protection cuts off the compressor, it is often because the evaporator is freezing. Turn off the unit and let it run in fan mode for 20 to 30 minutes to allow the ice to melt.

Issues related to the outdoor unit:

Obstruction of the outdoor unit: Leaves, dust, insects, or snow can block the air grilles of the RXS25L unit or equivalent. Regularly clean the air intake and exhaust. A blocked unit reduces heat exchange and causes abnormal pressure rise, triggering high-pressure safety (potential error code E3).
Refrigerant leak: A leak gradually reduces the amount of refrigerant fluid. The system detects this pressure drop and cuts off the compressor to protect it. You will notice little or no cooling. Contact a certified professional (only a licensed technician can work on the R-32 circuit).

Common error codes and causes:

Error code E0, E1, or E2: Communication problem or PCB fault
Error code E3: Refrigerant overheating (high pressure) - obstructed outdoor unit or lack of airflow
Error code E5: Compressor overheating - may indicate a refrigerant charge issue or a very dirty filter
Error code U0: Pressure too low - refrigerant leak or lack of circulation

Troubleshooting procedure to follow:

Turn off the unit using the remote control
Unplug the indoor and outdoor units from the electrical outlet for at least 5 to 10 minutes for a complete reset
Clean the filters of the indoor unit
Clear the outdoor unit of any obstruction
Reconnect both units and turn the unit back on by pressing the ON button
Note the error codes displayed on the remote control

When to consult a technician: If the problem persists after this procedure, do not attempt to repair it yourself. The FTXS25K operates with R-32 refrigerant, which is regulated. Call a certified refrigeration technician who can perform a thorough diagnosis, check the refrigerant charge, test the circuit pressure, and identify any leaks or malfunctions of the compressor or electronic expansion valve.

Question 7

How to use the remote control of the Daikin FTXB-C air conditioner?

Accepted Answer

The remote control of the Daikin FTXB-C air conditioner allows you to easily control the various functions of the device. Here are the main features and usage tips:

1. Power On and Off

Use the ON/OFF button to turn the air conditioner on or off.

2. Selecting the Operating Mode

You can select different modes according to your needs:

Cooling: to cool the room.
Heating: to heat the air.
Dehumidification: to reduce ambient humidity.
Ventilation: to circulate air without changing the temperature.

3. Temperature Adjustment

The + and - buttons allow you to increase or decrease the desired temperature according to the selected mode.

4. Fan Speed

You can adjust the fan speed between several levels (low, medium, high) for optimal comfort.

5. Timer

The timer function allows you to program the automatic on or off of the air conditioner at specific times, convenient for saving energy.

6. Energy Saving Function

Some models have an Energy Saving mode that optimizes electricity consumption while maintaining good comfort.

7. Display and Other Functions

The remote control usually displays the ambient temperature and may include other options such as the orientation of the louvers or advanced settings depending on the model.

By using these functions, you can easily adapt the operation of the Daikin FTXB-C air conditioner to your needs for optimal comfort all year round.

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