Baxi Baxi 200 Combi / 224 Combi 2/228 Combi 2/224 Combi LPG 2, Baxi 224 Combi 2 - 228 Combi 2 - 224 Combi LPG 2 USER MANUAL (7791867 - 06 - 03052022)

Please keep these instructions in a safe place.

If you move house, please hand them over to the next occupier.

United Kingdom

en

User Guide

High-efficiency wall-hung condensing gas boiler

224 Combi 2 - 228 Combi 2
224 Combi LPG 2

Dear Customer,

Thank you very much for buying this appliance.

Please read through the manual carefully before using the product, and keep it in a safe place for later reference. In order to
ensure continued safe and efficient operation we recommend that the product is serviced regularly. Our service and customer
service organisation can assist with this.

We hope you enjoy years of problem-free operation with the product.

Contents

Contents

1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.2.1 The Benchmark scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

1.2.2 Benchmark commissioning checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3 Liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.3.1 User's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

1.3.2 Installer's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.3.3 Manufacturer's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2 Additional documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 Symbols used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3.1 Symbols used in the manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4 Abbreviations/glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Homologations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1

3.1.1 Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

3.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

3.2.1 Technical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

3.2.2 Dimensions and connections/clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

4 Description of the product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

4.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

4.2 Operating principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.2.1 Air-gas adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

4.2.2 Combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.2.3 Heating and domestic hot water production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.3 Control panel description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.3.1 Description of the keys and knobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

4.4 Accessories & options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

5 Operation

5.1 Start-up

5.2 Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.3 Frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

6.1

6.2 List of USER parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.2 Maintenance instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.3 Maintenance message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.1.1 Procedure for first start-up

5.1.2 Changing the heating flow temperature . .

5.1.3 Changing the domestic hot water (DHW) temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.1

Access to USER parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7.2.1

7.2.2

Switching off the heating and domestic water (DHW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Filling the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Venting the installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

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8 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

8.1 Temporary and permanent faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

8.2 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

8.3

Fault finding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

200 Combi 2 3

Contents

9 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

9.1 Decommissioning procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

10 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

10.1 Disposal and recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

11 Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

11.1 Energy saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

11.2 Room thermostats and settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

12 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

12.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

12.2 Standard warranty terms and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

13 Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

13.1 Product fiche - Combination boilers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

13.2 Package fiche - boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

13.3 Package fiche - Combination heaters (boilers or heat pumps) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

4 200 Combi 2

1 Safety

1.1 General safety instructions

1 Safety

Danger
This boiler can be used by children aged 8 years and above and
by persons with reduced physical, sensory or mental capabilities
or lack of experience and knowledge when they have been given
supervision or instruction concerning the safe use of the device
and understand the resulting risks. Children must not be allowed
to play with the appliance. Cleaning and user maintenance must
not be carried out by children without supervision.

Danger
If you smell gas:

1. Turn off the gas supply at the meter.

2. Open windows and doors in the hazardous area.

3. Do not operate light switches.

4. Do not operate any electrical equipment.

5. Do not use a telephone in the hazardous area.

6. Extinguish any naked flame and do not smoke.

7. Warn any other occupants and vacate the premises.

8. Telephone the National Gas Emergency Service on:- 0800
111 999.

Fig.1 Taps ON and OFF

A

B

PN-0000367

Important
If a water or gas leak occurs or is suspected, the boiler can be

isolated at the inlet valves by turning their taps through 90° (1/

4

turn) downwards.

A ON
B OFF

For advice please contact your Installer, Annual Service Provider
or Baxi Customer Support - The Service Division of Baxi. You can
contact Baxi Customer Support on telephone number 0344 871

1545.
When contacting Baxi Customer Support it will be useful to have
the "Benchmark Checklist " at the back of the Installation &
Service Manual to hand as it includes details relevant to the boiler
and installation.

Warning
Do not touch flue/chimney pipes. Depending on the settings of the
appliance, the temperature of flue/chimney pipes may exceed 60
°C.
Do not touch radiators for long periods. Depending on the settings
of the appliance, the temperature of radiators may reach 85 °C.
Take precautions with domestic hot water. Depending on the
settings of the appliance, domestic hot water temperature may
reach 65 °C.

Caution
Do not neglect to service the appliance. Contact a qualified
professional or take out a maintenance contract for the annual
servicing of the appliance.

200 Combi 2 5

1 Safety

1.2 Recommendations

Caution

Only qualified professionals are authorised to work on the boiler
and the installation.
The appliance has an integral frost protection mode as long as
there is power to the boiler.

Important

Regularly check the water pressure in the system
(recommended pressure is 1.5 bar).
Keep the appliance accessible at all times.
Do not remove or cover the user information and serial number
labels affixed to the boiler control flap. They must remain legible
throughout the lifetime of the boiler.

1.2.1 The Benchmark Scheme

Baxi Heating UK Ltd is a licensed member of the Benchmark Scheme
which aims to improve the standards of installation and commissioning of
domestic heating and hot water systems in the UK and to encourage
regular servicing to optimise safety, efficiency and performance.

Benchmark is managed and promoted by Heating and Hotwater Industry
Council. For more information visit www.centralheating.co.uk

1.2.2 Benchmark Commissioning Checklist

Please ensure that the installer has fully completed the Benchmark
Checklist on the inside back pages of the installation instructions supplied
with the product and that you have signed it to say that you have received
a full and clear explanation of its operation. The installer is legally required
to complete a commissioning checklist as a means of complying with the
appropriate Building Regulations (England and Wales).

All installations must be notified, by the installer, to Local Area Building
Control either directly or through a Competent Persons Scheme. A
Building Regulations Compliance Certificate will then be issued to the
customer who should, on receipt, write the Notification Number on the
Benchmark Checklist.

This product should be serviced annually to optimise its safety, efficiency
and performance. The service engineer should complete the relevant
section of the Benchmark Service Record in the Installation & Service
manual after each service.

The completed Benchmark Checklist & proof of annual servicing (where
applicable) will be required in the event of any warranty work.

6 200 Combi 2

1.3 Liabilities

1 Safety

1.3.1 User's liability

To guarantee optimum operation of the system, you must abide by the
following instructions:

Read and follow the instructions given in the manuals provided with the
appliance.
Call on a qualified professional to carry out installation and initial
commissioning.
Get your installer to explain your installation to you.
Have the required inspections and maintenance carried out by a
qualified installer.
Keep the instruction manuals in good condition close to the appliance.

1.3.2 Installer's liability

The installer is responsible for the installation and initial commissioning of
the appliance. The installer must observe the following instructions:

Read and follow the instructions given in the manuals provided with the
appliance.
Install the appliance in compliance with prevailing legislation and
standards.
Carry out initial commissioning and any checks necessary.
Explain the installation to the user.
If maintenance is necessary, warn the user of the obligation to check the
appliance and keep it in good working order.
Give all the instruction manuals to the user.

1.3.3 Manufacturer's liability

Our products are manufactured in compliance with the requirements of the
various Directives applicable. They are therefore delivered with the
marking and any documents necessary. In the interests of the quality of
our products, we strive constantly to improve them. We therefore reserve
the right to modify the specifications given in this document.

Our liability as manufacturer may not be invoked in the following cases:

Failure to abide by the instructions on installing and maintaining the
appliance.
Failure to abide by the instructions on using the appliance.
Faulty or insufficient maintenance of the appliance.

200 Combi 2 7

2 About this manual

2 About this manual

2.1 General

Warning
Installation, repair and maintenance must only be carried out only
by a competent person.

All Gas Safe registered engineers carry an ID card with their licence
number and a photograph. You can check your engineer is registered by
telephoning 0800 408 5500 or online at www.gassaferegister.co.uk

This manual is intended for the user of the Baxi 200 Combi 2 boiler. If the
appliance is sold or transferred, or if the owner moves leaving the
appliance behind you should ensure that the manual is kept with the
appliance for consultation by the new owner and their installer.

The appliance is designed as a boiler for use in residential domestic
environments on a governed meter supply only. The selection of this boiler
is entirely at the owner’s risk. If the appliance is used for purposes other
than or in excess of these specifications, the manufacturer will not accept
any liability for resulting loss, damage or injury.

The manufacturer will not accept any liability whatsoever for loss, damage
or injury arising as a result of failure to observe the instructions for use,
maintenance and installation of the appliance.

2.2 Additional documentation

2.3 Symbols used

Various timers, external controls, etc. are available as optional extras. Full
details are contained in the relevant sales literature.

2.3.1 Symbols used in the manual

This manual uses various danger levels to draw attention to special
instructions. We do this to improve user safety, to prevent problems and to
guarantee correct operation of the appliance.

Danger
Risk of dangerous situations that may result in serious personal
injury.

Danger of electric shock
Risk of electric shock.

Warning
Risk of dangerous situations that may result in minor personal
injury.

Caution
Risk of material damage.

2.4 Abbreviations/glossary

8 200 Combi 2

Important
Please note: important information.

See
Reference to other manuals or pages in this manual.

CH Central heating

DHW
PCU
Pnc
SU

Domestic hot water
PCB for managing burner operation
Condensing output
Safety PCB

3 Technical specifications

3 Technical specifications

3.1 Homologations

Tab.1 Certifications

UKCA certificate number

NOx class 6
Boiler type

3.2 Technical data

748363

C13, C

33

3.1.1 Certification

3.2.1 Technical information

Important
All data in these sections are nominal and subject to normal pro
duction tolerances.

Tab.2 Technical settings for combination heaters with boilers

Baxi - Combi (C)

Gas Council numbers

Condensing boiler Yes Yes
Low-temperature boiler
B1 boiler No No
Cogeneration space heater No No
Combination heater Yes Yes
Rated heat output

Useful heat output at rated heat output and

high temperature setting
Useful heat output at 30% of rated heat out

put and low temperature setting
Seasonal space heating energy efficiency

Useful efficiency at rated heat output and high

temperature setting
Useful efficiency at 30% of rated heat output

and low temperature setting
Auxiliary electricity consumption
Full load

Partial load

Standby mode

Other items
Heat loss on standby

Ignition burner power consumption

Annual energy consumption

Sound power level, indoors

Nitrogen oxide emissions NOx mg/kWh
Domestic hot water parameters
Declared load profile XL XL
Daily electricity consumption

Annual electricity consumption

Water heating energy efficiency

Daily fuel consumption

Annual fuel consumption

(1) Low temperature means for condensing boilers 30°C, for low temperature boilers 37°C and for other heaters 50°C return temperature (at heater inlet).

(2) High temperature setting means 60 °C return temperature at boiler inlet and 80 °C flow temperature at boiler outlet

(1)

Prated

P4

(2)

P1

(1)

ƞs

ƞ4

(2)

ƞ1

(1)

elmax

elmin

PSB

Pstby

Pign
QHE
LWA

Qelec

AEC

ƞwh

Qfuel

AFC

kW

kW

kW

%

%

%

kW

kW

kW

kW

kW

GJ

dB

kWh

kWh

%

kWh

GJ

224 228 224 LPG

47-077-48 47-077-49 47-077-50

No No

20 20 20

20 20 20

6.7 6.7 6.7

93 93 93

88.2 88 88.2

97.9 97.8 97.9

0.037 0.026 0.037

0.014 0.014 0.014

0.004 0.004 0.004

0.04 0.04 0.04

- -

62 62 62

50 49 50

23 21 23

0.176 0.185 0.176

39 41 39

88 85 88

22.03 22.72 22.03

17 17 17

Yes

No

No

No

Yes

-

XL

200 Combi 2 9

3 Technical specifications

Tab.3 General

Rated heat input (Qn) for domestic hot water
Rated heat input (Qn) with domestic hot water tank
Rated heat input (Qn) for heating
Reduced heat input (Qn) 80/60 °C
Rated heat output (Pn) for domestic hot water
Rated heat output (Pn) with domestic hot water tank
Rated heat output (Pn) 80/60 °C for heating
Rated heat output (Pn) 50/30 °C for heating
Reduced heat output (Pn) 80/60 °C
Reduced heat output (Pn) 50/30 °C
Rated efficiency 50/30 °C (Hi)

Tab.7 Characteristics of the heating circuit

Maximum pressure
Minimum pressure
Temperature range for heating circuit
Water capacity of expansion vessel

224 228 224 LPG

kW

24.7 28.9

kW - –
kW
kW
kW

20.6 20.6

4.9 6.0
24 28.0

kW - –
kW
kW
kW
kW

%

20 20

21.8 21.8

4.8 5.8

5.2 6.3

105.8 105.8

224 228 224 LPG

bar
bar

2.5 2.5

0.5 0.5

°C 25 - 80 25 - 80

l

7 7

24.7

-

20.6

4.9
24

-

20

21.8

4.8

5.2

105.8

2.5

0.5

25 - 80

7

Tab.8 Characteristics of the domestic water circuit

Minimum pressure
Maximum pressure
Minimum dynamic pressure
Minimum water flow
Specific flow (D)
Temperature range for domestic water circuit
Domestic water production with ΔT = 25 °C
Domestic water production with ΔT = 35 °C

Tab.9 Combustion characteristics

G20 gas consumption (Qmax)
G20 gas consumption (Qmax) with domestic hot water tank
G20 gas consumption (Qmin)
G31 propane gas consumption (Qmax)

G31 propane gas consumption (Qmin)
Diameter of separate discharge pipes
Diameter of coaxial discharge pipes
Flue gas mass flow rate (max)
Flue gas mass flow rate (max) with domestic hot water tank
Flue gas mass flow rate (min)

224 228 224 LPG

bar
bar

bar
l/min
l/min

0.8 0.8

8.0 8.0

0.15 0.15

2.0 2.0

11.5 13.4

°C 35 - 60 35 - 60
l/min
l/min

13.8 16.0

9.8 11.4

224 228 224 LPG

3

/h

m

3

m

/h – –

3

/h

m

kg/h

kg/h

2.61 3.06

0.52 0.63

–
–

mm 80/80 80/80
mm 60/100 60/100

kg/sec

0.011 0.013

kg/sec – –
kg/sec

0.002 0.003

0.8
8

0.15
2

11.5

35 - 60

13.8

9.8

2.61
–

0.52

–
–

1.92

0.38

80/80

60/100

0.011
–

0.002

Tab.10 Electrical characteristics

Power supply voltage
Power supply frequency
Rated electric power
Rated electrical output with domestic hot water tank

10 200 Combi 2

224 228 224 LPG

V

Hz

W

230 230

50 50
90 85

W – –

230

50
90

–

Tab.11 Other characteristics

Humidity protection rating (EN 60529)
Net weight when empty/filled with water
Dimensions (height/width/depth)

Fig.2 Dimensions and connections

224 228 224 LPG

IP X5D X5D

kg 26.5/28.5 27.5/29.5

mm 700/395/285 700/395/285

Dimensions and connections/clearances

3.2.2

3 Technical specifications

X5D

26.5/28.5

700/395/285

395 mm

700 mm

1

2

4

3

5 mm

28

1

Safety valve
Heating circuit flow fitting (G3/4”)

2

Fitting for condensate discharge

3
4

DHW (Domestic Hot Water) outlet fitting (G1/2”)

5

Gas inlet fitting (G3/4”)

6

Domestic cold water inlet fitting (G1/2”)

7

Heating circuit return fitting (G34")

5

6

7

BO-0000199-1

200 Combi 2 11

4 Description of the product

4 Description of the product

4.1 General description

4.2 Operating principle

The purpose of this gas-fuelled condensing boiler is to heat water to a
temperature that is lower than boiling point at atmospheric pressure. It
must be connected to a heating installation and to a domestic hot water
distribution system that is compatible with its power and performance
ratings. Features of this boiler:

Low pollutant emissions,
High-efficiency heating,
Front control panel with display,
Lightweight and compact.

4.2.1 Air-gas adjustment

The air is drawn in by the fan and gas injected directly at the height of the
venturi. The fan revolution speed is regulated automatically by the
electronic board based on the adjustment settings. The gas and air are
mixed in the manifold. The gas/air ratio ensures that the quantity of gas
and air are adjusted correctly to always obtain optimal combustion. The
gas/air mixture is fed into the burner at the front of the exchanger.

Here, the electric igniter triggers the mixture with a series of sparks that
burn, producing thermal energy.

4.2.2 Combustion

The burner heats the heating water circulating in the heat exchanger.
When the temperature of the combustion gas is lower than the dew point
(around 55 °C), the water vapour contained in the combustion gas
condenses in the flue gas side of the heat exchanger. The heat recovered
during this condensation process (the latent heat or condensing heat) is
also transferred to the heating water. Once cooled, the combustion gases
are discharged through the exhaust pipe. The condensed water is
discharged through a siphon.

4.2.3 Heating and domestic hot water production

In boilers used for heating and for producing domestic hot water, an
integrated plate heat exchanger heats the domestic water. The heated
water is then channelled to the heating installation or to the plate heat
exchanger via a three-way valve. A flow sensor detects that a hot water
tap has been turned on and communicates this to the PCB, which
switches the three-way valve to the hot water position and activates the
pump. The three-way valve is spring-loaded and only consumes electricity
when switching from one position to another. Precedence is given to a
heat request in domestic water mode.

12 200 Combi 2

4.3 Control panel description

4 Description of the product

Fig.3 Control panel

Fig.4 Display screen

4.3.1

Description of the control panel

Knobs

HEATING: Using this knob you can modify the flow
temperature for the heating installation (heating
setpoint 25-80 °C).

turn the knob anti-clockwise to reduce the temperature
or to the left to scroll through the menus. With an outside
sensor connected it is possible to limit the setpoint value;
turn the knob clockwise to increase the temperature or to
the right to scroll through the menus.

DOMESTIC HOT WATER: Using this knob you can
modify the domestic hot water temperature (DHW setpoint
35-60 °C) or scroll through the menus to the left and right:

turn anti-clockwise to reduce the temperature.
turn clockwise to increase the temperature.

Icons

Chimney sweep mode is enabled (forced full load or low
load for

The burner is on.

Display of the system water pressure.

DHW operation is enabled.

CO2 measurement).

4.4 Accessories & options

CH operation is enabled.

Information menu: read out various current values.

User menu: user-level parameters can be configured.

Installer menu: installer-level parameter can be configured.

Error menu: errors can be read out.

Counter menu: various counters can be read out.

Buttons

Back (previous menu)

Manual reset

Menu

Confirms selection or value.

1 Chimney sweep mode:

Press the Back and Manual reset keys simultaneously.

Consult the sales catalogue for all available accessories and options.

200 Combi 2 13

5 Operation

5 Operation

5.1 Start-up

5.1.1 Procedure for first start-up

The following information appears on the display when the boiler is
electrically powered:

1. The message "INIT"" appears, indicating that the "Initialisation" phase
is active (a few seconds);

2. The software version "Vxx.xx." appears (two seconds);

3. The software version for boiler settings "Pxx.xx." appears (two
seconds);

4. The boiler and heating installation venting phase has started. During
operation, the display shows in alternate mode "– – – – – – – –", the
word “DEAIR” and the pressure value for the heating circuit. This
phase lasts 6 minutes and 20 seconds, at the end the boiler is ready
for operation;

5. The symbol and the "x.x" installation water pressure value

appear.

In the event of a power outage the procedure will be repeated from the
beginning.
To activate a heating request, the room thermostat must be set to a
temperature above the current temperature (or open a domestic water
tap.)

Fig.5 Scrolling through the menus and/or

settings

Fig.6 Scrolling through the menus and/or

settings

5.1.2

1. Use the knob to adjust the flow temperature in heating mode.

2. Press the key to confirm the value or wait a few seconds until the

Changing the heating flow temperature

Turn the knob anti-clockwise to reduce the temperature value. Turn
the knob clockwise to increase the temperature value.

Important
With an outside sensor connected it is possible to lower the
setpoint value.

value is automatically saved.

Important
The flow temperature on the display automatically matches the
temperature set when using a:

Weather-dependent regulator.
OpenTherm regulator.

5.1.3 Changing the domestic hot water (DHW) temperature

1. Use the knob to adjust the domestic hot water temperature.

Turn the knob anti-clockwise to reduce the temperature value.
Turn the knob clockwise to increase the temperature value.

14 200 Combi 2

2. Press the key to confirm the value or wait a few seconds until the
value is automatically saved.

5.2 Shutdown

5 Operation

5.2.1 Switching off the heating and domestic hot water (DHW)

5.3 Frost protection

Heating mode can also be disabled by turning the
until the word OFF appears on the display.

Important
When heating mode is re-enabled check, by turning the knob, that
the comfort temperature is that requested.

Important
Heating is disabled but the frost protection function remains
activated.

Domestic hot water mode can also be disabled by turning the

knob anti-clockwise until the word OFF appears on the display.

To switch the boiler off completely, switch off the power supply to the
appliance and close the gas cock.

Important
In this condition, the boiler and the heating installation are not
protected against frost.

It is a good idea to prevent the heating installation from draining
completely, as changing the water can result in unnecessary and
damaging limescale deposits from forming inside the boiler and heating
elements. If the thermal installation is not intended to be used during the
winter months and there is a risk of frost, we recommend mixing suitable
antifreeze solutions designed for a specific purpose (e.g. propylene glycol,
which contains limescale and corrosion inhibitors) into the water in the
installation. The boiler's electronic control system is equipped with an
"antifreeze" function for the heating system. This function activates the
boiler pump when the heating system flow temperature falls below 7 °C. If
the water temperature reaches 4 °C, the burner is switched on, bringing
the system water to a temperature of 10 °C. When this value is reached
the burner switches off and the pump continues to operate for another 3
minutes.

knob anti-clockwise

Important
The frost protection function will not work if there is no power
being supplied to the boiler or if the gas supply cock is closed.

200 Combi 2 15

6 Settings

6 Settings

6.1 Access to USER parameters

Fig.7 Accessing the user parameters

6.2 List of USER parameters

Tab.9 Table of parameters

Name Description

CH operation

AP016

AP017

AP073

AP074

DP004

DP070

DP200

0: Off
1: On

Domestic hot water (DHW)
0: Off
1: On

Average external temperature [°C] when switching from summer/
winter mode (with outside sensor)

Force summer mode (with outside sensor)
0: Auto according to AP073
1: Summer

Anti-legionella function
0: Disabled
1: Weekly
2: Daily (only available with Room Unit)

Domestic hot water temperature setpoint.
In the case of operation with a calorifier tank and programming via
room unit corresponding to the comfort setpoint [°C]

DHW mode:
0: Domestic hot water programming (only available with Room Unit)
1: Manual (boiler with calorifier tank) – Preheating active (instanta
neous boiler)
2: Antifreeze (boiler with calorifier tank) – No preheating (instantane
ous boiler)

To display/modify the list of USER parameters, proceed as follows:

Maxi
mum

on the menu

Level

press the + keys simultaneously, the symbol
bar starts to flash;

turn the

turn the

to confirm;

modify the value of the parameter using
the Press the key to confirm;

Press the key to exit.

knob until the

knob until you reach the required setting. Press the key

Important
The factory settings for certain settings may differ based on the
market the product is destined for.

appears. Press the key to confirm;

knob;

Factory
value

1 – – User

1 – – User

22 10 30 User

0 – – User

0 – – User

60 35 60 User

2 – – User

Mini
mum

16 200 Combi 2

Tab.10 Settings table with eMO Life

Name Description

CP060

Required ambient temperature (°C) in the zone in the holiday/anti
freeze period

Factory
value

6 5 20 User

Mini
mum

Maxi
mum

Level

Maximum ambient setpoint temperature (°C) in reduced mode that

CP070

enables switching to comfort mode with climate control (with outside

16 5 30 User

sensor)

CP080 Temperature (°C) set by SLEEP activity in the zone 16 5 30 User

CP081 Temperature (°C) set by HOME activity in the zone 20 5 30 User

CP082 Temperature (°C) set by AWAY activity in the zone 6 5 30 User

CP083 Temperature (°C) set by MORNING activity in the zone 21 5 30 User

CP084 Temperature (°C) set by EVENING activity in the zone 22 5 30 User

CP085 Temperature (°C) set by CUSTOM activity in the zone 20 5 30 User

CP200 Required ambient temperature (°C) for the zone in manual mode 20 5 30 User

CP250 Correct the temperature measured by the room unit 0 -5 +5 User

Zone operating mode
0: Scheduling

CP320

1: Manual

0

– – User

2: Off

6 Settings

CP510 Temporary room setpoint per zone 20 5 30 User

Fireplace mode

CP550

0: Disabled

0 – – User

1: Enabled

Timer programme selected by User

CP570

0: Program 1
1: Program 2

0 – – User

2: Program 3

Timer programme selected for DHW

DP060

0: Program 1
1: Program 2

0 – – User

2: Program 3

DP080 Reduced temperature setpoint for the domestic hot water tank [°C] 35 10 60 User

DP337 Domestic hot water temperature setpoint for the holiday period [°C] 10 10 60 User

Important
The factory values of some parameters may differ according to
the target market of the product.

200 Combi 2 17

7 Maintenance

7 Maintenance

7.1 General

7.2 Maintenance instructions

The boiler does not require any special maintenance. However, the boiler
must be serviced annually in accordance with the Installation and Service
Manual and the relevant section of the Benchmark Service Record com
pleted in order to maintain the warranty.

Note
Taking out a maintenance contract is recommended.

Caution
Maintenance operations must be performed by a qualified compe
tent person.
Use only BAXI genuine spare parts.

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

To ensure continued safety, functionality and efficiency, the boiler must
be inspected annually by the installer/service engineer in order to ensure
the performance of the product constant over time, we recommend
having the boiler's energy efficiency checked annually by a qualified
technician. Accurate maintenance is always a reason for safety and
savings in the management of the system.

Periodically check that the pressure shown on the display with the system
cold is between 1 - 1.5 bar. If it is lower, act on the system filling tap. It is
advisable that the opening of this tap is carried out very slowly in order to
facilitate degassing.

Important
The boiler is equipped with a hydraulic pressure switch which
does not allow the boiler to operate in case of low pressure.
If frequent pressure drops should occur, call the installer/
service engineer

Fig.8

Water pressure

7.2.1 Filling the installation

If the water pressure is too low, the system must be re-pressurised.

The normal operating water pressure is between 1 and 2 bar. If the pres
sure exceeds 3 bar the safety pressure valve will operate and a fault is in
dicated. Ensure that the temporary filling loop is disconnected. Contact
your installer.

It may be necessary to repressurise the system occasionally (when the
water pressure falls below 0.7). A filling device (the filling loop) will be
fitted on the system. This will be on the boiler itself, or on pipework near to
the boiler. Seek advice from your installer.

Note
If the water pressure requires regular re-pressurising a fault or
leak is indicated. Seek advice from your installer.

Note
The system pressure is shown at all times on the LCD display
and can be viewed when there is power to the boiler.

When the figures on the display indicates between 1 and 1.5 bar the
pressure is correct.

18 200 Combi 2

BO-0000026

1

2

3

4

C1

A

B

C

D

7 Maintenance

Fig.9

Venting the installation

7.

2.2

It is essential to eliminate any air in the boiler, pipes or fittings because

Venting the installation

this can cause irritating noise during heating or the intake of water. To do
this, proceed as follows:

1. Open the valves (A & B)

of all the radiators connected to the central

heating system.

2.

Set the ambient thermostat as high as possible.
Wait for the radiators to heat up.

3.

4.

Set the ambient thermostat as low as possible.
Wait about 10 minutes until the radiators have cooled down.

5.

6.

Vent the radiators. Start with the lower floors.
Open the vent valve (C & C1) holding a cloth

7.
Wait until water comes out of the vent valve and then tighten it

8.

(D) against the valve.

again.

9.

After venting, check that the system is still at sufficient pressure.

Important
Take care as the water might still be hot.

Important
If the hydraulic pressure of the water in the central heating
system is below 0.8 bar, it is advised to increase the pressure
(the recommended hydraulic pressure is 1.0 - 1.5 bar)

.

7.3 Maintenance message

Fig.10 Maintenance message

The purpose of this function is to warn the user that the boiler requires
maintenance.

flashes, When the letters SVC appear on the screen and the symbol

the boiler requires maintenance. Contact your installer.

200 Combi 2 19

8 Troubleshooting

8 Troubleshooting

8.1 Temporary and permanent faults

The codes on the display indicate two types of fault: volatile and
permanent. The first item shown on the display is a letter followed by a
two-digit number. The letter indicates the type of fault: temporary (H) or
permanent (E). The number indicates the group in which the fault that has
occurred is classified according to its impact on safe and reliable
operation. The second item shown flashes alternately with the first and
consists of a two-digit number that indicates the type of fault which has
occurred (see the following fault tables).

TEMPORARY FAULT (A/H.x.x.)

A temporary fault is shown on the display by the letter “A” or “H” followed
by a number (group). A temporary fault is a type of fault that does not
cause a permanent stoppage of the boiler. It has the following
characteristics:

A: The appliance continues to operate. It disappears as soon as the cause
has been resolved.

H: Disappears when the error condition is removed, in some cases even
after 10 minutes.

PERMANENT FAULT (E.x.x)

A permanent fault is shown on the display by the letter "E" followed by a
number (group). Press the RESET button for one second. If faults are
shown frequently, contact our authorised technical assistance centre.

E: Stoppage, reset required..

8.2 Error codes

Tab.11 List of temporary faults

DISPLAY

Group
code

H.00 .42 Pressure sensor open/faulty

H.01 .00 Temporary communication failure in the PCB The error is resolved automatically

H.01 .05

H.01 .08 Flow temperature increase in heating mode too quick.

H.01 .14 Maximum flow or return temperature value reached.

Specific
code

DESCRIPTION OF TEMPORARY FAULTS

Maximum temperature difference value between flow
and return reached.

CAUSE – Check/Solution

An installer is required for most checks and solu
tions.

SENSOR/CONNECTION PROBLEM
Check the operation of the pressure sensor
Check the sensor/PCB connection

INSUFFICIENT CIRCULATION
Check the boiler/installation circulation
Activate a manual venting cycle
Check the installation pressure
OTHER CAUSES
Check the cleanliness of the exchanger
Check the operation of the temperature sensors
Check the temperature sensor connection

INSUFFICIENT CIRCULATION
Check the boiler/installation circulation
Activate a manual venting cycle
Check the installation pressure
Check the operation of the pump
OTHER CAUSES
Check the cleanliness of the exchanger
Check the operation of the temperature sensors
Check the temperature sensor connection

INSUFFICIENT CIRCULATION
Check the boiler/installation circulation
Activate a manual venting cycle

20 200 Combi 2

8 Troubleshooting

DISPLAY

Group
code

Specific
code

DESCRIPTION OF TEMPORARY FAULTS

CAUSE – Check/Solution

An installer is required for most checks and solu
tions.

INSUFFICIENT CIRCULATION
Check the installation pressure
Activate a manual venting cycle

H.01 .18 No water circulation (temporary).

Check the operation of the pump
Check the boiler/installation circulation
TEMPERATURE SENSOR ERROR
Check the operation of the temperature sensors
Check the temperature sensor connection

INSUFFICIENT CIRCULATION
Check the installation pressure
Activate a manual venting cycle

H.01 .21

Flow temperature increase during domestic hot water
operation too fast.

Check the operation of the pump
Check the boiler/installation circulation
TEMPERATURE SENSOR ERROR
Check the operation of the temperature sensors
Check the connection of the temperature sensors

H.02 .00 Reset in progress. It resolves itself

H.02 .02

H.

02 .03

Waiting for configuration settings to be entered
(CN1,CN2

Configuration settings (

).

CN1,CN2

) not entered correc

tly.

CN1/CN2 CONFIGURATION MISSING
Configure CN1/CN2

Check configuration
CN1/CN2

correctly

CN1/CN2

MAIN PCB ERROR

H.02 .04 PCB settings cannot be read.

Configure CN1/CN2
Replace the main PCB

H.02 .05

Setting memory not compatible with the boiler PCB ty
pe.

Contact the Service Network

Check the installation pressure and restore

H.02 .07 Low pressure in heating circuit (water filling required).

Check the expansion vessel pressure
Check for boiler/installation leaks

H.02 .09

H.02 .10

Partial stoppage of the boiler (antifreeze function acti
ve)

Total stoppage of the boiler (antifreeze function not
active)

H.02 .70 External unit heat recovery test failed

H.03 .00 No identification data for boiler safety device.

SIGNAL INDICATING BLOCKING INPUT
Contact X15 open, check connected devices
Parameter configuration error: Check AP001

SIGNAL INDICATING BLOCKING INPUT
Contact X15 open, check connected devices
Parameter configuration error: Check AP001

PCB accessory error SCB-09
Check the device connected to contact X9

MAIN PCB ERROR
Contact the Service Network

ELECTRODE PROBLEM
Check the electrode connection and wiring
Check the condition of the electrode

H.03 .02 Temporary flame loss

GAS SUPPLY
Check the gas supply pressure
Check the gas valve calibration
FLUE GAS PIPES
Check the pipes and the terminal

H.03 .05 Power supply voltage too low Check the mains voltage

ELECTRODE PROBLEM
Check the electrode electrical connections
Check the condition of the electrode
GAS SUPPLY
Check the gas inlet pressure
Check the gas valve calibration
FLUE GAS EXHAUST PIPE

H.

03 .54

Temporary flame loss
Shutdown due to the power supply voltage being too
low

Check the air intake and flue gas exhaust termi
nal
Check the power supply voltage

Configure

200 Combi 2 21

8 Troubleshooting

Tab.12 List of permanent faults (boiler stoppage, reset required)

DISPLAY

Group
code

Specific
code

DESCRIPTION OF PERMANENT FAULTS (RESET)

E.00 .04 Return temperature sensor disconnected

E.00 .05 Return temperature sensor short circuited

E.00 .16 DHW tank temperature sensor not connected

E.00 .17 DHW tank temperature sensor short-circuited

E.00 .20

E.00 .21

The flue gas temperature sensor is not connected or
measured a temperature below the range

The flue gas temperature sensor has short-circuited
or measured a temperature above the range

E.01 .04 Flame loss detected five times in 24 hours

E.01 .12

Temperature measured by return sensor greater than
flow temperature

E.01 .17 No water circulation (permanent)

E.01 .20 Maximum flue gas temperature reached

E.02 .13

Total stoppage of the boiler (antifreeze function not
active)

E.02 .17 Permanent communication failure in the PCB

CAUSE – Check/Solution

An installer is required for most checks and solu
tions.

SENSOR/CONNECTION PROBLEM
Check the operation of the temperature sensor
Check the sensor/PCB connection

SENSOR/CONNECTION PROBLEM
Check the operation of the sensor
Check the sensor/PCB connection

SENSOR OPEN
Check the operation of the sensor
Check the sensor/PCB connection
When removing a domestic hot water tank, set
parameter DP150=1

SENSOR CLOSED
Check the operation of the sensor
Check the sensor/PCB connection

SENSOR OPEN
Check the operation of the sensor
Check the sensor/PCB connection

SENSOR CLOSED
Check the operation of the sensor
Check the sensor/PCB connection

GAS SUPPLY
Check the gas supply pressure
Check the gas valve calibration
ELECTRODE PROBLEM
Check the electrode connection and wiring
Check the condition of the electrode
FLUE GAS PIPES
Check the air intake and flue gas exhaust pipes
EXCHANGER ON FLUE GAS SIDE BLOCKED
Check the cleanliness of the exchanger
MAINS VOLTAGE
Check the power supply voltage

SENSOR/CONNECTION PROBLEM
Check that the sensors are positioned the correct
way around
Check that the flow sensor is in the correct posi
tion Check the return temperature in the boiler
Check the operation of the sensors

INSUFFICIENT CIRCULATION
Check the installation pressure
Activate a manual venting cycle
Check the operation of the pump
Check the boiler/installation circulation
SENSOR ERROR
Check the operation of the temperature sensors
Check the temperature sensor connection

EXCHANGER ON FLUE GAS SIDE BLOCKED
Check the cleanliness of the exchanger

SIGNAL INDICATING BLOCKING INPUT
Contact X15 open, check connected devices
Parameter configuration error: Check setting
AP001

MAIN PCB ERROR
Check for any electromagnetic interference
Contact the Service Network

22 200 Combi 2

8 Troubleshooting

DISPLAY

Group
code

Specific
code

DESCRIPTION OF PERMANENT FAULTS (RESET)

CAUSE – Check/Solution

An installer is required for most checks and solu
tions.

COMMUNICATION FAULT

E.

02 .35 Critical safety device disconnected

Start the auto-detect function (parameter AD)
Check the devices connected to contact X9

02 .39

E.

Minimum pressure not reached after 6 minutes of au
tomatic filling

AUTOMATIC FILLING ERROR
Check automatic filling is working

ELECTRICAL CONNECTION ERROR

E.02

.47 Connection to external device unsuccessful

Start the auto-detect function (parameter AD))
Check the electrical connections of external devi
ces.

SENSOR/CONNECTION PROBLEM

E.04 .01 Flow temperature sensor short circuited

Check the sensor/PCB connection
Check the operation of the sensor

SENSOR/CONNECTION PROBLEM

E.04 .02 Flow temperature sensor disconnected

Check the sensor/PCB connection
Check the operation of the sensor

INSUFFICIENT CIRCULATION

E.04 .03

Maximum flow temperature exceeded or flow tempe
rature sensor short circuited

Check the boiler/installation circulation
Activate a manual venting cycle
Check the operation of the sensors

INSUFFICIENT CIRCULATION
Check the pressure in the installation
Switch on the manual degassing function
Check that the pump is working

E.04 .08 Maximum safe temperature value reached

Check the circulation in the boiler/installation
OTHER POSSIBLE CAUSES
Check the safety thermostat connection
Check that the safety thermostat is working cor
rectly

GAS SUPPLY
Check the gas supply pressure
Check the gas valve electrical connection
Check the gas valve calibration
Check the operation of the gas valve

E.04 .10 Burner failed to ignite after 4 attempts

ELECTRODE PROBLEM
Check the electrode electrical connections
Check the electrode condition
OTHER CAUSES
Check the operation of the fan
Check the condition of the flue gas exhaust (bloc
kages)

Check the ground circuit

E.04 .12 Ignition failure for monitoring parasitic flame

Check the power supply voltage
Check the electrode conditions

FAN/PCB PROBLEM

E.04 .13 Fan blade blocked or maximum rpm exceeded

Check the PCB-fan connection
Check the fan operation

E.04 .17 Fault in gas valve control circuit

E.04 .18

The flow temperature is below the minimum tempera
ture or the flow temperature sensor is not connected

E.04 .23 Communication internal stoppage

MAIN PCB ERROR
Check the electrical connections for the gas valve

SENSOR/CONNECTION PROBLEM
Check the sensor/PCB connection
Check the operation of the sensor

Switch the power supply off and on again and
then RESET

E.04 .29 Communication internal stoppage Switch the power supply off and on again and

then RESET

E.04 .254 Fault in gas valve control circuit

MAIN PCB ERROR
Check the electrical connections

200 Combi 2 23

8 Troubleshooting

Tab.13 List of warnings

DISPLAY

Group
code

Specific
code

A.00 .28

A.00 .29

DESCRIPTION OF WARNINGS BEFORE A FAULT
IS DETECTED

Solar temperature sensor is either removed or
measures a temperature below range

Solar temperature sensor is either shorted or
measures a temperature above range

CAUSE – Check/Solution

Check the solar temperature sensor wiring. Re
place the sensor if necessary. In case of removal
of the solar tank, set the parameter DP150=1.

Check the solar temperature sensor wiring. Re
place the sensor if necessary.

OUTDOOR SENSOR NOT DETECTED

A.00 .34

Outdoor temperature sensor expected but not detec
ted

Enter the correct value of the parameter AP091
Connect the outdoor sensor
Outdoor sensor is not connected correctly

Check the installation pressure and restore

A.02 .06 Low pressure in heating circuit

Check the expansion vessel pressure
Check for boiler/installation leaks

COMMUNICATION FAULT

A.02 .36 Functional device disconnected

Start the auto-detect function (parameter AD)
Check the devices connected to contact X9

COMMUNICATION FAULT

A.02 .37 Passive functional device disconnected

Start the auto-detect function (parameter AD)
Check the devices connected to contact X9

A.02 .45 Connection error

A.02 .46 Device priority error

COMMUNICATION FAULT
Start the auto-detect function (parameter AD))

COMMUNICATION FAULT
Start the auto-detect function (parameter AD))

ELECTRICAL CONNECTION ERROR

A.02 .48 Unit function configuration error

Start the auto-detect function (parameter AD))
Check electrical connections of external devices

ELECTRICAL CONNECTION ERROR

A.02 .49 Failed node initialisation

Start the auto-detect function (parameter AD))
Check electrical connections of external devices

A.02 .54 Open Therm bus power supply error

Check the devices connected to contact X17 ­Terminal board M2 (7-8)

A.02 .55 Incorrect or missing serial number Contact the Service Network

Internal memory reserved for full customisation of set

A.02

.76

tings.

Contact the Service Network

No further changes can be made

24 200 Combi 2

Important
When connecting a Room Unit/Control Unit to the boiler, the code
“254” is always shown in the event of a fault.. Read the fault code
shown on the boiler display.

8.3 Fault finding

Tab.14 Problems and solutions

Problem Possible causes Solution

Check that the boiler is being supplied with power.
Check fuses and the switches.
Check whether the gas isolation cock is properly
open.
If the property has a prepayment meter ensure it
has sufficient credit.

Increase the value with the CH temperature knob
or if a room thermostat is connected, increase the
temperature on the room thermostat.

system.

Check fuses and switches.
Check whether the gas isolation cock is properly
open.
If the property has a prepayment meter ensure it
has sufficient credit.

Increase the value with the CH temperature knob
or if a room thermostat is connected, increase the
temperature on the room thermostat.

heat.

Check the fuses and switches.

Correct the error, if possible.

Open the gas isolation cock.

ing temperatures.

There is no domestic hot wa
ter.

The radiators are cold.

The boiler is not working.

The boiler is not working.

The DHW function is switched off. Activate the DHW mode.

The water pressure is too low (< 0.5 bar). Re-pressurise the system.

Insufficient flow. Flow must be at least 2 litres per minute.

The temperature set point for the heating
is too low.

The heating mode is deactivated. Activate the heating mode.

The radiator valves are not open. Open the valves of all radiators connected to the

The boiler is not working. Check that the boiler is being supplied with power.

The water pressure is too low (< 0.5 bar). Re-pressurise the system.

The temperature set point for the heating
is too low.

No demand for heating. Ensure that timers & thermostats are calling for

No power supply. Check that the boiler is being supplied with power.

The water pressure is too low (< 0.5 bar). Re-pressurise the system.

The boiler is indicating an error. Press the Reset button.

The gas pressure is too low. Check whether the gas isolation cock is fully open.

Condensate drain blocked. Check drain, especially any external runs in freez

8 Troubleshooting

If the boiler is not working also check section "Operation checking
procedure and basic fault identification" or contact your Installer.

200 Combi 2 25

9 Decommissioning

9 Decommissioning

9.1 Decommissioning procedure

Caution
Only qualified persons are authorised to work on the appliance
and system to decommission.

If your boiler needs to be decommissioned either temporarily or
permanently the following should be performed:

1. Switch off the boiler’s electrical connection.

2. Close the gas isolation tap.

3. Drain the central heating system.

Seek the advice of your installer.

26 200 Combi 2

MW-3000179-03

10 Disposal

10.1 Disposal and recycling

Fig.11 Recycling

10 Disposal

The appliance is composed of multiple components made from various
different materials, such as steel, copper, plastic, fibreglass, aluminium,
rubber, etc..

These materials may be highly pollutant. This means that the boiler must
be disposed of correctly by contacting staff at the nominated disposal
facility or by taking it to a centre that is authorised to dispose of bulky
waste (domestic appliances).

Warning
Removal and disposal of the boiler must be carried out by a
qualified installer in accordance with local and national
regulations.

200 Combi 2 27

11 Environmental

11 Environmental

11.1 Energy saving

11.2 Room thermostats and settings

Tips on saving energy:

Do not cover radiators. Do not hang curtains in front of radiators.
Install reflective panels behind the radiators to prevent heat loss.
Insulate the pipes in rooms that are not heated (cellars and lofts).
Install loft insulation & double glazing.
Use draught excluders where necessary.
Upgrade any older boiler external controls.
Turn down room thermostats by 1°.
Turn off radiators in rooms not in use.
Do not run hot (or cold) water pointlessly.
Fit a water-saving shower head to save up to 40 % energy.
Take showers rather than baths. A bath consumes twice as much water
and energy.

Various models of room thermostat are available. The thermostat type and
setting affect the total energy consumption.

A few tips:

A modulating thermostat in combination with thermostatic radiator valves
saves energy and offers considerable comfort. This combination gives
you flexibility with the temperatures. Do not fit thermostatic radiator
valves in the room in which the room thermostat is installed.
Completely closing and opening thermostatic valve radiators causes
undesirable temperature fluctuations. Open and close thermostatic
valves in small steps.
Lower the thermostat to around 20°C. This reduces heating costs and
energy consumption.
Lower the room thermostat temperature temporarily if opening windows
to air the rooms.
If you are using an ON/OFF type thermostat, reduce the water
temperature value in summer (e.g. 60°C in summer and 80°C in winter).
When setting an hourly programmable thermostat, consider days when
you are absent or on holiday. Electricity production and energy savings
reach their optimum level with a programmed and activated timer
programme.

28 200 Combi 2

12 Warranty

12.1 General

To make sure your boiler warranty is activated and maintained, it is
essential that the:

1. Benchmark checklist is completed by your installer

2. Warranty is registered within 30 days

3. Boiler has an annual service

12.2 Standard warranty terms and conditions

Warranty registration, service & repair
For full terms and conditions, visit www.baxi.co.uk/terms.

Benchmark checklist
The Benchmark Checklist will be completed by your installer and records
that the boiler has been installed and commissioned correctly. It can be
found at the back of the installation and service manual and should be
kept in a safe place for the life of the boiler. We will check that the
Benchmark Checklist has been completed on an in-warranty visit.

12 Warranty

Important
Please note that failure to adhere to terms and conditions will
invalidate your warranty.

Ways to register your warranty
If your boiler is eligible for an extended warranty, your installer may
register the product on your behalf and provide you with the relevant
documentation. Please check with your installer.

Should this not be the case, you can register your warranty online at
www.baxi.co.uk/registration

Annual service
A service must be completed every 12 months from the date of installation
to maintain your warranty.

This service must be completed by one of the following:

A Gas Safe registered installer/engineer
Baxi Customer Support; call us 0344 871 1545

Please make sure that your engineer has logged the service information at
the back of the installation and service manual. You will be asked for your
service history on any in-warranty repair visit.

If you experience a problem with your boiler
For any in or out of warranty repair, Baxi Customer Support is on hand to
help you. Call our award-winning team to arrange for one of our
nationwide team of Gas Safe registered engineers to visit.

If your product is in warranty, everything is free of charge, subject to our
warranty terms and conditions. If it is out of warranty, we can still help and
offer a range of options you can choose from to suit your needs.

Contact Baxi Customer Support 0344 871 1545

Opening hours
Monday - Friday, 8.00am - 6.00pm

Weekends and Bank Holidays, 8.30am - 2.00pm

Please note calls may be recorded for training and monitoring purposes.

When contacting Baxi Customer Support, please have the following
information to hand:

Boiler serial number.

200 Combi 2 29

12 Warranty

Proof of purchase if you do not have the boiler serial number

Please note that for in-warranty repairs, our engineers will ask to see your
service history record, completed Benchmark Checklist and details of your
installer. These can all be found in the Installation and Service manual.

30 200 Combi 2

13 Appendix

13 Appendix

13.1 Product fiche - Combination boilers

Tab.15 Product fiche for combination boilers

224 228

Space heating - Temperature application Medium Medium Medium

Water heating - Declared load profile XL XL XL

Seasonal space heating energy efficiency class

Water heating energy efficiency class

Rated heat output

(Prated or Psup)

kW 20 20 20

Space heating - Annual energy consumption GJ 62 62 62

Water heating - Annual energy consumption

kWh

GJ

(1)

(2)

39
17

41
17

Seasonal space heating energy efficiency % 93 93 93

Water heating energy efficiency % 88 85 88

Sound power level L

(1) Electricity

(2) Fuel

indoors dB 50 49 50

WA

224 LPG

39
17

See
For specific precautions about assembling, installing and
maintaining: Safety, page 5

200 Combi 2 31

13.2 Package fiche - boilers

Fig.12 Package fiche for boilers indicating the space heating energy efficiency of the package

13 Appendix

Seasonal space heating energy effi ciency of boiler

Temperature control

from fi che of temperature control

Supplementary boiler

from fi che of boiler

Solar contribution

from fi che of solar device

Tank volume (in m³) Collector size (in m²)

(1) If tank rating is above A, use 0.95

Supplementary heat pump

from fi che of heat pump

Class I = 1%, Class II = 2%, Class III = 1.5%,
Class IV = 2%, Class V = 3%, Class VI = 4%,
Class VII = 3.5%, Class VIII = 5%

Seasonal space heating energy effi ciency (in %)

Tank rating

Collector effi ciency (in
%)

Seasonal space heating energy effi ciency (in %)

A* = 0.95, A = 0.91,
B = 0.86, C = 0.83,
D - G = 0.81

+ %

(1)

‘I’

1

%

2

3

%( - ‘I’ ) x 0.1 = ±

4

%(‘III’ x + ‘IV’ x ) x 0.9 x ( /100) x = +

5

%( - ‘I’ ) x ‘II’ = +

Solar contribution AND Supplementary heat pump

select smaller value

Seasonal space heating energy effi ciency of package

Seasonal space heating energy effi ciency class of package

G F E D C B A A

<30%

54

OR

+

++

A

+++

A

6

7

Boiler and supplementary heat pump installed with low temperature heat emitters at 35°C ?

from fi che of heat pump

The energy effi ciency of the package of products provided for in this fi che may not correspond to its actual energy effi ciency once installed
in a building, as this effi ciency is infl uenced by further factors such as heat loss in the distribution system and the dimensioning of the
products in relation to building size and characteristics.

7

AD-3000743-01

%0.5 x 0.5 x = -

%

%+ (50 x ‘II’) =

32 200 Combi 2

13 Appendix

I

The value of the seasonal space heating energy efficiency of the
preferential space heater, expressed in %.

II

The factor for weighting the heat output of preferential and
supplementary heaters of a package as set out in the following
table.

III

The value of the mathematical expression: 294/(11 · Prated),
whereby ‘Prated’ is related to the preferential space heater.

IV

The value of the mathematical expression 115/(11 · Prated),
whereby ‘Prated’ is related to the preferential space heater.

Tab.16 Weighting of boilers

Psup / (Prated + Psup)

(1)(2)

II, package without hot water storage tank II, package with hot water storage tank

0 0 0

0.1 0.3 0.37

0.2 0.55 0.70

0.3 0.75 0.85

0.4 0.85 0.94

0.5 0.95 0.98

0.6 0.98 1.00

≥ 0.7 1.00 1.00

(1) The intermediate values are calculated by linear interpolation between the two adjacent values.
(2) Prated is related to the preferential space heater or combination heater.

Tab.17 Package efficiency

Baxi Combi 224

Temperature control X %

Temperature control Y %

228

224 LPG

200 Combi 2 33

13 Appendix

13.3 Package fiche - Combination heaters (boilers or heat pumps)

Fig.13 Package fiche for combination heaters (boilers or heat pumps) indicating the water heating energy efficiency of the

package

Water heating energy effi ciency of combination heater

Declared load profi le:

Solar contribution

Auxiliary electricity

from fi che of solar device

Water heating energy effi ciency of package under average climate

Water heating energy effi ciency class of package under average climate

G F E D C B A A

M

L

1

%

‘I’

2

%(1.1 x ‘I’ - 10%) x ‘II’ ‘III’ - - ‘I’ = +

3

%

+

++

A

+++

A

XL

XXL

Water heating energy effi ciency under colder and warmer climate conditions

Colder:

Warmer:

The energy effi ciency of the package of products provided for in this fi che may not correspond to its actual energy effi ciency once installed
in a building, as this effi ciency is infl uenced by further factors such as heat loss in the distribution system and the dimensioning of the
products in relation to building size and characteristics.

<28%

23

%- 0.2 x =

23

%+ 0.4 x =

AD-3000747-01

I

The value of the water heating energy efficiency of the combination
heater, expressed in %.

II

The value of the mathematical expression (220 · Q
where Q
15 and Q

is taken from Regulation EU 811/2013, Annex VII Table

ref

from the product fiche of the solar device for the

nonsol

declared load profile M, L, XL or XXL of the combination heater.

III

The value of the mathematical expression (Q
expressed in %, where Q
solar device and Q

ref

is taken from the product fiche of the

aux

from Regulation EU 811/2013, Annex VII

Table 15 for the declared load profile M, L, XL or XXL.

)/Q

ref

· 2,5)/(220 · Q

aux

nonsol

,

ref

),

34 200 Combi 2

© Copyright

All technical and technological information contained in these technical instructions, as well as any drawings and technical
descriptions supplied, remain our property and shall not be multiplied without our prior consent in writing. Subject to alterations.

Baxi Customer Support

0344 871 1545

Opening hours

Monday - Friday, 8.00am-6.00pm

Weekends and Bank Holidays, 8.30am-2.00pm

Please note calls may be recorded for training and monitoring purposes

baxi.co.uk

Register now to activate your warranty:

www.baxi.co.uk/registration

For the warranty to be maintained, please make sure...

1

Benchmark checklist is completed

2

Warranty is registered within 30 days

3

The boiler has an annual service

For full terms and conditions, visit www.baxi.co.uk/terms. Failure to adhere to
terms and conditions will void your manufacturer’s warranty.

Baxi
Brooks House,
Coventry Road,
Warwick, CV34 4LL

Please ensure the boiler is installed in accordance with these installation
instructions and that you adhere to the Building Regulations.

e&oe
All descriptions and illustrations provided in this document 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.

7791867 - 06 - 03052022

0086