Combi 80 HE Plus - Central heating boiler Baxi - Free user manual and instructions

Product Type	Gas-fired condensing combi boiler for central heating and domestic hot water
Brand	Baxi
Model	Combi 80 HE Plus
Energy Source	Natural gas (G20) / LPG (G31) convertible
Electrical Supply	230 V ~ 50 Hz
Heating Output (Max)	28 kW
DHW Output (Max)	28 kW
DHW Flow Rate (at 35°C rise)	11.5 L/min
Efficiency (Condensing)	Up to 89.5% (seasonal efficiency)
Dimensions (H x W x D)	700 x 400 x 310 mm
Weight (Net)	32 kg
Flue Type	Horizontal or vertical flue (concentric 60/100 mm)
Gas Connection	15 mm compression fitting
Water Connections	22 mm compression (flow & return), 15 mm DHW
Expansion Vessel Capacity	8 L, pre-charge 0.75 bar
Overheat Protection	Automatic reset thermal cut-out
Frost Protection	Built-in thermostat activates pump and burner if temp drops below 5°C
Pressure Relief Valve	Preset to 3 bar
Maintenance Interval	Annual service by a Gas Safe registered engineer
Spare Parts Availability	Available through Baxi and authorized distributors
Repair Index (Reparability)	8.5/10 (high repairability)
User Interface	Digital display with push-button controls

Frequently Asked Questions - Combi 80 HE Plus Baxi

How do I reset the boiler after a fault?

Press and hold the reset button (marked with a flame icon) for 3 seconds until the display stops flashing. If the fault persists, consult the manual or contact a Gas Safe engineer.

What should the water pressure be?

The recommended system water pressure is 1.0 to 1.5 bar when cold. If it drops below 0.5 bar, you must repressurize via the filling loop. The pressure gauge is located on the front panel.

Why is my hot water temperature fluctuating?

Fluctuations can be caused by a blocked plate heat exchanger, low gas pressure, or incorrect gas valve setting. First ensure the DHW temperature dial is set to a fixed position. If issues persist, an annual service may be required.

How often should I service the boiler?

Baxi recommends an annual service by a Gas Safe registered engineer. This ensures safe operation, maintains efficiency, and validates your warranty.

What does the error code E119 mean?

Error E119 indicates a flame detection issue. This may be due to a faulty flame sensing electrode, gas supply interruption, or contaminated burner. Call a qualified engineer to inspect and reset.

Can I use an external thermostat with this boiler?

Yes, the Combi 80 HE Plus has terminals for a room thermostat or programmer. Use volt-free contacts (230V) or connect a compatible wireless thermostat. Refer to the wiring diagram in the manual.

Why is the boiler making a loud banging noise?

Loud banging (kettling) is usually due to limescale or sludge buildup in the heat exchanger. A power flush and descaler treatment by an engineer can resolve this. Ensure the system has inhibitor.

How do I bleed the radiators?

Turn off the boiler and allow it to cool. Use a radiator key to open the bleed valve slightly until air escapes and water appears. Close the valve and check the system pressure, repressurizing if needed.

The pilot light is off but it's an electronic ignition model - what now?

This boiler does not have a standing pilot. It uses an electronic spark ignition only when heat is needed. If no flame, check gas supply and power. If the spark continues but no ignition, call an engineer.

Where can I find spare parts?

Original Baxi spare parts are available through Baxi's official website, authorized distributors, and Gas Safe registered engineers. Use the spare parts list in the manual to order the correct component.

USER MANUAL Combi 80 HE Plus Baxi

User's Operating Instructions & Important Warranty Information

Technical line drawing of a mechanical device with internal components and an arrow indicating rotation (no text or symbols)

Baxi Combi 133 HE Plus

Baxi Combi 100 HE Plus

Baxi Combi 80 HE Plus

Gas Fired Wall Mounted Condensing

Combination Boiler

Please keep these instructions in a safe place. If you move house, please hand them over to the next occupier.

Natural Gas

Baxi Combi 133 HE Plus

G.C.N° 47 075 14

Baxi Combi 100 HE Plus

G.C.N° 47 075 15

Baxi Combi 80 HE Plus

G.CN° 47 075 16

Contents

Section Page

1.0 Quick Reference Guide 3

2.0 Troubleshooting 4

3.0 Repressurising 6

4.0 Clearances 7

5.0 Care of the Boiler 8

6.0 Legislation 9

7.0 Emergency 10

8.0 Warranty & Service 12

Baxi is one of the leading manufacturers of domestic heating products in the UK.

Our first priority is to give a high quality service to our customers. Quality is designed into every Baxi product - products which fulfil the demands and needs of customers, offering choice, efficiency and reliability.

To keep ahead of changing trends, we have made a commitment to develop new ideas using the latest technology - with the aim of continuing to make the products that customers want to buy.

Everyone who works at Baxi has a commitment to quality because we know that satisfied customers mean continued success.

We hope you get a satisfactory service from Baxi. If not, please let us know.

© Baxi Heating UK Limited 2005 All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, or stored in any retrieval system of any nature (including in any database), in each case whether electronic, mechanical, recording or otherwise, without the prior written permission of the copyright owner, except for permitted fair dealing under Copyrights, Designs and Patents Act 1988.

Applications for the copyright owner's permission to reproduce or make other use of any part of this publication should be made, giving details of the proposed use, to the following address:

The Company Secretary, Baxi Heating UK Limited, Pentagon House, Sir Frank Whittle Road, Derby, DE21 4XA.

Full acknowledgement of author and source must be given.

WARNING: Any person who does any unauthorised act in relation to a copyright work may be liable to criminal prosecution and civil claims for damages.

This product has an energy rating (A) on a scale of A to G. For more information see www.boilers.org.uk. This is a certification mark.

Baxi Heating UK Limited is a BS-EN ISO 9001 Accredited Company

	Domestic Hot Water(Green Light)	This indicates that the Burner has fired up and heating your water.
	Flame Failure(Red Light)	If Flame Failure Light is ON press the Reset Button. If Flame Failure occurs frequently consult your Installer.
	Burner On(Green Light)	This indicates that the Burner has fired up and is heating your system.
ON	Mains On(Green Light)	This indicates that there is electricity to the Boiler.
	Domestic Hot WaterControl Knob(No OFF Position)	Turn the Domestic Hot Water Control Knob clockwise to increase or anticlockwise to decrease the temperature.
	Reset Button	The Reset Button should extinguish the Flame Failure Light and allow normal operation to commence.
	Central HeatingControl Knob(No OFF Position)	Turn the Central Heating Control Knob clockwise to increase or anticlockwise to decrease the boiler flow temperature.

graph TD
    A["Input Port 1"] --> B["Control Unit 1"]
    C["Input Port 2"] --> D["Control Unit 2"]
    E["Input Port 3"] --> F["Control Unit 3"]
    G["Input Port 4"] --> H["Control Unit 4"]
    I["Input Port 5"] --> J["Control Unit 5"]
    K["Input Port 6"] --> L["Control Unit 6"]
    M["Input Port 7"] --> N["Control Unit 7"]
    O["Input Port 8"] --> P["Control Unit 8"]
    Q["Input Port 9"] --> R["Control Unit 9"]
    S["Input Port 10"] --> T["Control Unit 10"]
    U["Input Port 11"] --> V["Control Unit 11"]
    W["Input Port 12"] --> X["Control Unit 12"]
    Y["Input Port 13"] --> Z["Control Unit 13"]
    AA["Input Port 14"] --> AB["Control Unit 14"]
    AC["Input Port 15"] --> AD["Control Unit 15"]
    AE["Input Port 16"] --> AF["Control Unit 16"]
    AG["Input Port 17"] --> AH["Control Unit 17"]
    AI["Input Port 18"] --> AJ["Control Unit 18"]
    AK["Input Port 19"] --> AL["Control Unit 19"]
    AM["Input Port 20"] --> AN["Control Unit 20"]

Domestic Hot Water Temperature Control

Turn the Domestic Hot Water Temperature Control Knob clockwise to increase or anticlockwise to decrease the temperature. Range 45 - 55°C.

Central Heating Temperature Control

Turn the Central Heating Temperature Control Knob clockwise to increase or anticlockwise to decrease the boiler flow temperature.

Reset Button

If the Red Flame Failure Light (A) is ON or flashing, press the Reset button until the red light goes OFF. If this occurs frequently a fault is indicated, you should contact your installer.

Boiler not working
2.0 Troubleshooting

graph TD
    A["START"] --> B["Make sure the gas supply is turned ON and check if other gas appliances are operating (e.g. fire, cooker)."]
    B -->|YES| C["Is there electricity to the boiler? (Green Mains ON Light lit)."]
    B -->|NO| D["If no gas, consult your supplier."]
    C -->|YES| E["Is the Green Burner ON Light illuminated?"]
    C -->|NO| F["Mains ON Light (Green)"]
    F --> G["Check electrical supply to boiler is switched on."]
    E --> H["Burner ON Light (Green)"]
    H --> I["Boiler operating satisfactorily."]
    I --> J["YES"]

graph TD
    A["Is the Central Heating System Pressure between 1 and 2.5 bar ?"] -->|NO| B["Pressure Gauge"]
    B --> C{If the reading falls below 1 bar repressurise the system as described in section 3.0}
    C --> D["Boiler indicators showing low pressure"]
    D --> E["Pressure Gauge"]
    E --> F{Is the Red Flame Failure Light illuminated or flashing ?}
    F -->|NO| G["CONTACT YOUR INSTALLER OR SERVICE ENGINEER."]
    F --> H{Flame Failure (Red)}
    H --> I{Press the Reset Button until the red light goes off.}
    I --> J["Reset Button"]
    J --> K{If the light does not go out or keeps coming on}
    K --> L["End"]

graph TD
    A["Is the Timer ON and calling for heat?"] --> B{YES}
    B -->|Yes| C["Is the Room Thermostat (if fitted) set high enough?"]
    C -->|NO| D["Turn Room Thermostat to maximum setting (typical example shown)"]
    D --> E["NO"]
    E --> F{No}
    F -->|YES| G["End"]
    F -->|YES| H["End"]
    I["Typical examples of external timers"] --> J["Typical icon: CH ON with a light bulb"]
    J --> K["Optional integral timer with 'CH ON' and 'CH OFF' display"]
    K --> L["NO"]
    L --> M["Ensure timer is set for Central Heating ON (see any instructions supplied with timer)"]

If you don't know what you need to do to get the boiler to light, or need help with the system and controls, contact your installer as soon as possible

Fig. I

Fig. 2

3.0 Repressurising System

3.1 Central Heating System Pressure

1. The normal operating water pressure is in the green area between 1 and 2.5 bar (Fig. 1). If the pressure exceeds 3 bar the safety pressure valve will operate and a fault is indicated. Contact your installer.
2. It may be necessary to repressurise the system occasionally (Fig. 2). A filling device (the 'filling loop') will be fitted on the system. This may be on the boiler itself, or on pipework near to the boiler.
3. If you are unsure of its position, or cannot identify it, consult the installer who fitted the boiler.
4. The filling loop consists of two taps and a separate metal braided hose pipe (Fig. 3).
5. Only when repressurising should the hose be connected between the two taps. No tools are necessary for this, but ensure that the wing nuts on the hose pipe ends are tightened onto the taps.
6. Fully open one of the taps first, and then while watching the pressure gauge, carefully open the second tap.
7. When the needle on the gauge is into the green zone and indicating I (Fig. 1) or more turn both taps off.
8. Disconnect the hose from the taps (a small amount of water may be present) and remove it. Keep the hose in a safe place for future use.

4.0 Clearances

Fig. 4

4.1 your Safety

1. This appliance must have been installed in accordance with the manufacturer's instructions and the regulations in force.
2. Any modification that may interfere with the normal operation of the appliance without express written permission from the manufacturer or his agent could invalidate the appliance warranty. In GB this could also infringe the Gas Safety (Installation and Use) Regulations.

GB - Heating Industry definition meaning England, Scotland, Wales, Northern Ireland, Isle of Man and the Channel Isles

1. Your boiler must not be operated without the casing correctly fitted.

2. Do not interfere with any sealed components on this boiler.

3. Take note of any warning labels on your boiler.

4. Your boiler should have the following minimum clearances for Safety and Maintenance (Figs. 4 & 5):

Top - 200mm

Bottom - 200mm

Left side - 5mm

Right Side - 5mm

Front - 5mm (In Operation)

- 500mm (For Servicing)

1. If your boiler is installed in a compartment, do not use it for storage purposes. Do not obstruct any purpose provided ventilation openings.

2. Flammable materials must not be stored in close proximity to your boiler.

3. Avoid skin contact when your boiler is in operation, as some surfaces may get hot e.g. pipework.

4. Ensure that the flue terminal outside the house does not become damaged or obstructed, particularly by trees or bushes.

5. It is important that the condensate drain system is not blocked, modified or damaged in any way as this would affect the operation of your boiler. Your installer should have insulated any exposed pipework.

5.0 Care of the Boiler

5.1 Managing the Outercase

1. The painted panels should be wiped with a damp cloth and then dried completely. DO NOT USE ABRASIVE CLEANING AGENTS.

5.2 Infection & Precautions

1. The boiler incorporates an integral frost protection feature that will operate in both modes. If the boiler temperature falls below 4 °C, the boiler will fire until a temperature of 15 °C is reached.
2. If a system frost thermostat has been fitted (your Installer will be able to advise you), then to operate correctly and protect your system, the gas and electricity must be left on and the appliance set in the central heating mode.
3. The boiler incorporates an integral pump protection feature which continually monitors the time since the pump last operated. To prevent seizure, the pump will operate for approximately 1 minute if it has not run in the last 24 hours.

6.0 Legislation

6.1 Allation, Commissioning, Service & Repair

1. This appliance must be installed in accordance with the manufacturer's instructions and the regulations in force. Read the instructions fully before installing or using the appliance.
2. In GB, this must be carried out by a competent person as stated in the Gas Safety (Installation & Use) Regulations.
3. Definition of competence: A person who works for a CORGI registered company and holding current certificates in the relevant ACS modules, is deemed competent.
4. In IE (Eire), this must be carried out by a competent person as stated in I.S. 813 "Domestic Gas Installations".

Fig. 6 CORGI Registration Card

All CORGI registered installers carry a CORGI identification card (see Fig. 6) and have a registration number. You can check your installer is registered by telephoning 0870 4012300 or writing to:-

I Elmwood, Chineham Business Park, Crockford Lane, Basingstoke. RG24 8WG

or check online at www.corgi-gas-safety.com

The boiler meets the requirements of Statutory Instrument "The Boiler (Efficiency) Regulations 1993 N° 3083" and is deemed to meet the requirements of Directive 92/42/EEC on the energy efficiency requirements for new hot water boilers fired with liquid or gaseous fuels:-

Type test for purpose of Regulation 5 certified by: Notified Body 0086.

Product/Production certified by: Notified Body 0086. Ref: 86-BL-647

For GB/IE only.

6.2 Benchmark Commissioning Check List

I. Please ensure that your installer hands you the boiler Installation & Service Instructions with the "Benchmark" Commissioning Checklist sections completed. The details in the Checklist will be required in the event of any warranty work. Keep the instructions in a safe place and ensure that the Service Interval Record at the back is completed at each service visit.

Warning!

If you smell gas

Turn off the gas supply at the meter and call your gas supplier immediately. It is possible to isolate the boiler and at the isolating valve (Fig. 7).

Transco operate a 24 hour emergency service and the telephone number will be listed in your telephone directory.

Faulty boiler

If it is known or suspected that a fault exists on the boiler, it must not be used until the fault has been corrected by a competent person.

In an Emergency

If a water or gas leak occurs or is suspected, the boiler can be isolated at the taps under the boiler as follows;

1. Turn off the electrical supply to the boiler.
2. Using a suitable flat bladed screwdriver turn the tap on the gas cock 90° clockwise to isolate the gas supply at the boiler (Fig. 7).
3. The heating system and mains water isolating valves are positioned under the boiler and can be closed by turning their taps 90° clockwise (Fig. 7).
4. Call your Installer or Service Engineer as soon as possible.

Please complete the boxes below

Serial Number

Empty white rectangle with a thin gray border (no text or symbols)

Date of Installation

Installer Details (name, address and contact number(s))

Blank white image with a thin black border (no text, symbols, or markings)

Technical line drawing of a mechanical device with labeled component (no text or symbols beyond label)

All descriptions and illustrations provided in this leaflet have been carefully prepared but we reserve the right to make changes and improvements in our products which may affect the accuracy of the information contained in this leaflet. All goods are sold subject to our standard Conditions of Sale which are available on request.

BAXI

A Trading Division of Baxi Heating UK, a division of Baxi Group Brooks House, Coventry Road, Warwick. CV34 4LL After Sales Service 08706 096 096 Technical Enquiries 08706 049 049 Website www.baxi.co.uk e&oe

A BAXI GROUP company

8.0 Warranty & Service

Standard Warranty Terms & Conditions

12 Months Free Warranty - register today

To receive your 12 months free warranty please complete the form supplied with the boiler or simply call heateam, the service division of Baxi Heating UK Limited on 08706 000 653.

Our promise to you

If you experience a fault with your new boiler, we aim to provide a safe and high quality repair service supported by our dedicated national network of highly skilled engineers. If your installer can't resolve the problem for you, we will do everything we can to get an engineer out to you as quickly as possible. Nothing in this warranty will affect your statutory consumer rights.

What you need to do if you experience a problem with your heating system or the operation of the boiler

You should always contact your installer first, because the fault may not be related to the boiler. If your installer confirms that the fault is within the boiler itself and he/she can't repair it, our friendly customer service team is on hand to help. Simply call our service division heateam on 08706 096 096 to book an engineer visit or for any general advice that you may need. Our contact centre is open Monday to Friday 8am - 6pm, weekends and Bank Holidays 8.30am - 2pm, excluding Christmas Day and New Years Day.

When calling heateam it would be helpful if you could have the following information to hand:-

I boiler serial number (see opposite).
2 boiler make and model number.
3 Your installer name and address details.
4 Proof of purchase (if you do not have the boiler serial number).

What this warranty covers

Free of charge repair or replacement of components found to be faulty from manufacture.

Free of charge replacement of the complete unit provided always that the failure is related to a manufacturing fault that cannot be repaired or is uneconomic to repair.

The warranty runs for 12 months from the date your product is installed.

What this warranty does not cover

Repairs to boilers which haven't been installed and commissioned properly, and as set out out in the installation instructions (this includes the need to flush the system effectively and add a suitable corrosion inhibitor).

Any damage caused by hard water scale deposits and/or aggressive water resulting from corrosion.

Any other defects or failures, either in the connected heating system or outside of the boiler itself

Faults caused by an inadequate supply of electricity, gas or water to the property.

Installations within commercial settings for which this boiler was not designed.

Reimbursement of any third party repair or replacement costs that we haven't been told about or agreed with you in advance.

Compensation for consequential losses (e.g. loss of earnings, business losses, stress and inconvenience) arising from a product breakdown, including repair delays caused by factors outside our reasonable control.

Annual Service

To ensure you receive the maximum efficiency from your boiler we recommend your boiler has an annual service so you and your family can continue to enjoy heating and hot water comfort. To arrange an annual service from one of our Baxi Heating UK Limited heating experts, please call to arrange a visit convenient to you.