Baxi Duo-tec 2 Combi GA Range Instruction Manual

© Baxi Heating UK Ltd 2013
Please keep these instructions in a safe place.
If you move house, please hand them over to the next occupier.
Duo-tec 2 Combi GA Range
Gas Fired Wall Mounted Condensing
Combination Boiler
User’s Operating Instructions &
Important Warranty Information

2© Baxi Heating UK Ltd 2013
© Baxi Heating UK Ltd 2013 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,
Brooks House, Coventry Road, Warwick. CV34 4LL
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.
1.0 Quick Reference Guide 3
2.0 Troubleshooting 4
3.0 Temperature / Care of the Boiler 6
4.0 Repressurising System & ‘Service Due’ 7
5.0 Clearances 8
6.0 Error Codes 9
7.0 Legislation 10
8.0 Emergency 11
9.0 Warranty & Service Back page
Section Page
Contents
Boiler Controls - see opposite page for
Operating Quick Reference Guide
(Fascia Panel removed for clarity)
0085
ISO 9001
FM 00866
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 the Heating and Hotwater Industry
Council. For more information visit www.centralheating.co.uk
Model Range
Baxi Duo-tec 2 Combi 24 GA
G.C.No 47-075-54
Baxi Duo-tec 2 Combi 28 GA
G.C.No 47-075-55
Baxi Duo-tec 2 Combi 33 GA
G.C.No 47-075-56
Baxi Duo-tec 2 Combi 40 GA
G.C.No47-075-57

1.0 Quick Reference Guide
3
© Baxi Heating UK Ltd 2013
R
R
DHW and CH OFF (frost protection still enabled)
Indicate errors that prevent burner from starting
Error - Not resettable by user
Water pressure too low
Indicates a resettable error
Indicates navigation in programming mode (parameter)
Indicates navigation in programming mode
Generic error
Burner lit
DHW request
Heating mode
Units for temperature
Units for pressure
Service due
Display Description
Central Heating (CH)
Temperature Adjustment
Boiler Information View Standby - Reset - Esc
R
Key to Controls
Display showing all available segment
Summer - Winter - Only Heating
Mode
Domestic Hot Water (DHW)
Temperature Adjustment
Summer - DHW only request mode
Winter - DHW & CH request mode
Only Heating - Only CH request mode
NOTE: When altering any settings it is necessary that
the buttons are FIRMLY pressed for several seconds.
R
Standby - Reset - Esc
Boiler Information View
Increase CH Temperature Button *
Decrease CH Temperature Button *
* Important Note: If your control system is fitted
with the Optional Outdoor Sensor, these buttons
will affect it’s operation. Please consult your
installer for advice.
Increase DHW Temperature Button
Decrease DHW Temperature Button
Summer / Winter / Only Heating Mode Button

2.0 Troubleshooting
4© Baxi Heating UK Ltd 2013
Boiler not working
START
Make sure the gas
supply is turned ON
and check if other
gas appliances are
operating (e.g. fire,
cooker).
NO
If no gas, consult
your supplier.
Is there electricity to the
boiler ? Is the display lit ?
R
Check electrical supply to
boiler is switched on.
NO
YES Is the Burner Flame
showing.
R
Burner Flame
(Indicates burner
is on)
Boiler operating
satisfactorily.
NO
YES
YES
YES Is the E and R symbol
illuminated or flashing ?
R
YES
Press the Reset Button
Error
Symbol
Reset Button
If it does
not reset
CONTACT YOUR
INSTALLER OR
SERVICE
ENGINEER.
R
Reset
Symbol
Is the Spanner symbol
illuminated or flashing ?
YES
Spanner
Symbol
Boiler
Temperature
Central Heating
Error Code
Flame
Failure
OR

2.0 Troubleshooting
5
© Baxi Heating UK Ltd 2013
Is the Timer ON and
calling for heat ?
Is the Room Thermostat (if
fitted) set high enough ?
12
1
2
3
4
5
6
7
8
9
10
11
Typical
examples of
external timer
Ensure timer is set for Central
Heating ON (see any
instructions supplied with timer)
NO
YES YES
NO
15
10
5
20
25
15
10
5
20
25
Turn Room Thermostat
to maximum setting
(typical example shown)
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
CH ON CH OFF
bar
0
1
2
3
4
Is the Central Heating
System Pressure between 1
and 2.5 bar ?
If the reading* falls below 1 bar
repressurise the system as
described in section 4.1.
NO
R
Error Code 118 showing low
pressure.
YES
*To display the water pressure
press 6 times. ‘05’ will alternate
with the system pressure.
(NOTE: When the pump is running
the gauge under the boiler may
show a slightly differnt reading to
the display)

3.0 Temperature / Care of the Boiler
6© Baxi Heating UK Ltd 2013
R
3.1 To increase or decrease the boiler temperature
1. Press the ( ) to increase the CH temperature.
2. Press the ( ) to decrease the CH temperature.
NOTE: An NTC device is positioned in the heat exchanger
which shuts down the appliance if the boiler temperature
exceeds 100°C. Press the ( ) button to re-establish
normal operating conditions.
3.2 To increase or decrease the domestic hot water
(DHW) temperature
1. Press the ( ) to increase the DHW temperature.
2. Press the ( ) to decrease the DHW temperature.
3.3 Summer - Winter - Only Heating Mode
1. Press ( ) button until the required mode appears:-
2. See 3.1 or 3.2 to set the required temperature.
3.4 Cleaning the Outercase
The painted panels should be wiped with a damp cloth and
then dried completely. DO NOT USE ABRASIVE CLEANING
AGENTS.
3.5 Boiler Frost Protection
1. The boiler incorporates an integral frost protection feature
that will operate in both CH & DHW modes, and also when in
standby ( displayed).
2. If the boiler temperature falls below 5° C, then the boiler will
operate until the water temperature has been raised.
3. Further protection may be required for the system. Consult
your installer for details.
3.6 Information Display
1. The table opposite shows information that can be displayed
by pressing the button.
Central Heating
Temperature Adjustment
R
Display Screen
Domestic Hot Water
Temperature Adjustment
R
Summer - DHW only request mode
Winter - DHW & CH request mode
Only Heating - Only CH request mode
Summer - Winter - Only Heating
Mode
The button can be pressed so that the display shows the following
information:-
1 press - ‘00’ alternates with Sub-Code (only when fault on boiler) or ‘000’
2 presses - ‘01’ alternates with CH Temperature
3 presses - ‘02’ alternates with Outside Temperature (where Sensor fitted)
4 presses - ‘03’ alternates with DHW Temperature
5 presses - ‘04’ alternates with DHW Temperature
6 presses - ‘05’ alternates with System Water Pressure
7 presses - ‘06’ alternates with Return Temperature
8 presses - ‘04’ alternates with Flue Temperature
9 presses - ‘05’ alternates with Heat Exchanger Temperature

4.0 Repressuring System & ‘Service Due’
7
© Baxi Heating UK Ltd 2013
bar
0
1
2
3
4
bar
0
1
2
3
4
4.1 Central Heating System Pressure
1. The normal operating water pressure is 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
(E117 displayed). Contact your installer.
2. It may be necessary to repressurise the system
occasionally (as Fig. 2 or E118 displayed). 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.
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
copper pipe with connection fittings.
5. Only when repressurising should the copper pipe be
connected between the two taps. Ensure that the nuts
on the 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. The system pressure is shown at all times on the
gauge under the boiler and can be viewed on the display
when there is power to the boiler.
8. To display the water pressure press 6 times. ‘05’
will alternate with the system pressure. (NOTE: When
the pump is running the gauge under the boiler may
show a slightly differnt reading to the display)
9. When the needle on the gauge or figures on the
display indicate 1 or more turn both taps off.
10. Disconnect the copper pipe from the taps (a small
amount of water may be present) and remove it. Keep
the pipe in a safe place for future use.
4.2 ‘Service Due’ Message
1. After 11 months operation the ‘Service Due’ message will
be shown on the boiler display.
2. Please contact your Installer, Annual Service Provider or
‘heateam’ - The Service Division of Baxi to arrange your
Annual Service. You can contact ‘heateam’ on telephone
number 08448 711 545 or visit www.heateam.co.uk
Fig. 1
Fig. 2
Normal Pressure
Requires
Repressurising
Pressure Gauge
Front and Side Panel
removed for clarity
View Under
Appliance
R
‘Service Due’
Message
‘Sd’ will show for
three seconds,
alternating with the
boiler temperature.

5.0 Clearances
8© Baxi Heating UK Ltd 2013
5.1 For 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.
3. Your boiler must not be operated without the casing
correctly fitted.
4. Do not interfere with any sealed components on this
boiler.
5. Take note of any warning labels on your boiler.
6. Your boiler should have the following minimum
clearances for Safety and Maintenance
(Figs. 3 & 4):-
Top - 175mm
Bottom - 150mm*
Left side - 5mm
Right Side - 5mm
Front - 5mm (In Operation)
- 450mm (For Servicing)
*This is MINIMUM recommended dimension. Greater
clearance will aid installation and maintenance.
7. If your boiler is installed in a compartment, do not use
it for storage purposes. Do not obstruct any purpose
provided ventilation openings.
8. Flammable materials must not be stored in close
proximity to your boiler.
9. Avoid skin contact when your boiler is in operation, as
some surfaces may get hot e.g. pipework.
10. Ensure that the flue terminal, outside the house,
does not become damaged or obstructed, particularly
by foliage.
11. 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.
GB - Heating Industry definition meaning England, Scotland,
Wales, Northern Ireland, Isle of Man and the Channel Isles
5mm
450mm
For Servicing
Purposes
Fig. 3
Fig. 4
In Operation
At least
1.5°
150mm* Min
763mm
450mm
175mm Min (300mm
Min if using 80/125mm
flueing system)
5mm Min 5mm Min
355mm
(345mm with flap removed)

6.0 Error Codes
9
© Baxi Heating UK Ltd 2013
6.1 List of Error Codes
1. The display shows two types of signals: and .
In both cases the display shows symbol and the numeric
value of the error (see the “error table” below).
2. The spanner cannot be reset by the user. Please
contact your Installer, Annual Service Provider or ‘heateam’ -
The Service Division of Baxi to arrange your Annual Service.
You can contact ‘heateam’ on telephone number 08448 711
545 or visit www.heateam.co.uk
3. Fault errors can be reset by pressing the button.
WARNING: If an error code (is different from the ones
described below) appears on the display or a certain fault
appears frequently, contact the authorised ‘heateam’.
R
RR
Gas Valve Connection Cable
Gas Valve Fault
Central Heating NTC Fault
Flue NTC Fault
Central Heating Return NTC Fault
Calibration Required
Pre-circulation Fault
Safety Thermostat Operated
Primary System Water Pressure Too High
Primary System Water Pressure Too Low
Circulation Fault (Primary)
Flame Failure
Flue NTC Operated
Interruption Of Gas Supply or Flame Failure
Elapsed Time - Gas Valve Open Without Gas
Interruption Of Gas Supply (Internal Error)
Flow/Return Sensor Temperature Test
Fan or Fan Wiring Fault
Circulation Fault (Dry Fire)
Hot Water NTC Fault
False Flame
09
15
20
28
40
55
109
110
117
118
125
128
130
133
134
135
154
160
270
321
384
Table Of Error Codes

7.0 Legislation
10 © Baxi Heating UK Ltd 2013
7.1 Installation, 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 Gas
Safe 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”.
Lifting - This product should be lifted and handled by two
people. Stooping should be avoided and protective equipment
worn where necessary. Carrying & lifting equipment should be
used as required, e.g. when installing in a loft space.
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
The boiler meets the requirements of Statutory Instrument
“The Boiler (Efficiency) Regulations 1993 No 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 0085.
Product/Production certified by:
Notified Body 0086.
Ref: 86-BL-647
For GB/IE only.
7.2 Benchmark Commissioning Checklist
1. 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).
2. All installations must be notified 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.
3. This product should be serviced regularly to optimise its
safety, efficiency and performance. The service engineer should
complete the relevant Service Record on the Benchmark
Checklist after each service.
4. The completed Benchmark Checklist may be required in the
event of any warranty work.

8.0 Emergency
11
© Baxi Heating UK Ltd 2013
If you smell gas
Do not operate light switches
Do not operate any electrical equipment
Do not use a telephone in the hazardous area
Extinguish any naked flame and do not smoke
Open windows and doors in the hazardous area
Turn off the gas supply at the meter
Warn any other occupants and vacate the premises
Telephone the National Gas Emergency Service on:-
0800 111 999
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.
Warning !
In an Emergency
1. 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° (1/4turn) downwards
2. Please contact your Installer, Annual Service Provider or
‘heateam’ - The Service Division of Baxi to arrange your
Annual Service. You can contact ‘heateam’ on telephone
number 08448 711 545 or visit www.heateam.co.uk
as soon as possible.
Black Taps - Water
Yellow Tap - Gas

© Baxi Heating UK Ltd 2013
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.
Serial Number
Date of Installation
Installer Details (name, address and contact number(s))
Please complete the boxes below
BAXI
A Trading Division of Baxi Heating UK Ltd (3879156)
Brooks House, Coventry Road, Warwick. CV34 4LL
After Sales Service 0844 871 1525 Technical Enquiries 0844 871 1555
Website www.baxi.co.uk
e&oe
DDMYY
M
Comp No. 7206335 - 07 (5/13)
9.0 Warranty & Service
Standard Warranty Terms & Conditions
To activate your second year free warranty you must register your boiler with
heateam the service division of Baxi Heating UK Ltd either by completing and
returning the registration card or calling our telephone registration line on
0800 013 7989.
It is also a requirement of the warranty that the boiler has an annual service
(every 12 months) in accordance with the installation and servicing
instructions, performed by a Gas Safe registered engineer.
If you would like heateam to carry this out please call on 0844 871 1525.
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 cause of the fault
may not be related to the boiler. If your installer confirms that the fault is with
the boiler and he/she can’t repair it, our friendly customer service team is on
hand to help. Simply call our service division heateam on 0844 871 1525 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:-
1 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 of faulty
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.
What this warranty does not cover
Repairs to boilers which haven’t been installed and commissioned properly,
and as set 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 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 production breakdown, including
repair delays caused by factors outside our reasonable control.
After Sales Service 0844 871 1525
Lift Flap for access to
Information Label