Baxi Duo-tec Combi HE A Operation instructions

© Baxi Heating UK Ltd 2008
Duo-tec Combi HE ARange
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.
Baxi Duo-tec Combi 28HE achieved the top score
of 34 boilers tested in a recent Which? report.
User’s Operating Instructions &
Important Warranty Information

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2© Baxi Heating UK Ltd 2008
© Baxi Heating UK Ltd 2008 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 Ltd, The Wyvern Business Park,
Stanier Way, Derby, DE21 6BF.
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 Repressurising System 6
4.0 Clearances 7
5.0 Care of the Boiler 8
6.0 Legislation 9
7.0 Notes 10
8.0 Emergency 11
9.0 Warranty & Service 12
Section Page
Contents
Boiler Controls - see opposite page
for Operating Quick Reference Guide
Natural Gas
Baxi Duo-tec Combi 24 HE A
G.C.No47 075 35
Baxi Duo-tec Combi 28 HE A
G.C.No47 075 36
Baxi Duo-tec Combi 33 HE A
G.C.No47 075 37
Baxi Duo-tec Combi 40 HE A
G.C.No47 075 38
Baxi Heating UK Ltd is a
BS-EN ISO 9001 Accredited Company
The code of practice for the installation,
commissioning & servicing of central
heating systems.
“Baxi” supports
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.

1.0 Quick Reference Guide
3
© Baxi Heating UK Ltd 2008
bar
0
1
2
3
4
bar
0
1
2
3
4
ON/OFF/Reset
Selector Switch
Display Central Heating
Temperature Control
Domestic Hot Water
Temperature Control
System Pressure Gauge
OFF Position
The boiler will not operate.
Central Heating Temperature Control
Turn the knob clockwise to increase or anticlockwise to decrease the temperature.
Range 25 - 80° C.
Domestic Hot Water Temperature Control
Turn the knob clockwise to increase or anticlockwise to decrease the temperature.
Central Heating Indicator - The indicator will illuminate when the boiler is in the central
heating mode.
Domestic Hot Water Indicator - The indicator will illuminate when hot water is being
supplied to a tap or shower.
Burner On Indicator - The indicator will illuminate when the burner has fired and is heating
your central heating or domestic hot water.
Boiler Output Temperature - In either the central heating or domestic hot water position
the display will illuminate showing the current boiler temperature in degrees centigrade.
Central Heating System Pressure - The normal operating water pressure is between 1 and
2.0 bar. If the pressure exceeds 3 bar the safety pressure valve will operate and a fault is
indicated. Contact your Installer.
Central Heating & Hot Water
Both Heating & Hot Water will operate.
Reset
Hold for approx 5 seconds and release.
Display
Position of
Optional Timer

2.0 Troubleshooting
4© Baxi Heating UK Ltd 2008
START
Make sure the gas supply is
turned ON and check if other
gas appliances are operating
(e.g. fire, cooker).
If no gas, consult your
supplier.
Is the ON/OFF/Reset
Select Switch in the
( ) position ?
Is the ( ) or ( ) light on
and the ( ) on ?
Check electricity to the
boiler is switched on.
Is the display lit ?
Display
Central Heating
Indicator
Domestic Hot
Water Indicator
Burner On
Indicator
Boiler operating satisfactorily.
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 3.1.
Does the display show an error
code e.g. E133, E110 ?
Boiler not working
NO
NO
YES YES
YES
NO
Turn the ON/OFF/Reset
Selector Switch to Reset.
Error Code E119 showing low
pressure.
NO
YES
YES
NO
If boiler does not
Reset

2.0 Troubleshooting
5
© Baxi Heating UK Ltd 2008
Is the Timer ON and calling for
heat ?
Ensure timer is set for Central
Heating ON (see any
instructions supplied with
timer).
Is the Room Thermostat (if
fitted) set high enough ?
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.
YES
NO
CONTACT YOUR
INSTALLER OR
SERVICE ENGINEER.
YES
12
1
2
3
4
5
6
7
8
9
10
11
CH ON CH OFF
Typical
examples of
external timer
NO

3.0 Repressurising System
6© Baxi Heating UK Ltd 2008
bar
0
1
2
3
4
bar
0
1
2
3
4
3.1 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.
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 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. When the needle on the gauge is indicating 1 or more
turn both taps off.
8. 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.
Fig. 1
Fig. 2
Normal Pressure
Requires
Repressurising

4.0 Clearances
7
© Baxi Heating UK Ltd 2008
Fig. 3
Fig. 4
200mm Min
780mm
450mm
200mm Min
(300mm Min if
using 80/125mm
flueing system
5mm Min
5mm Min
450mm Min
For Servicing
Purposes
In Operation
5mm Min 4.1 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 - 200mm
Bottom - 200mm
Left side - 5mm
Right Side - 5mm
Front - 5mm (In Operation)
- 450mm (For Servicing)
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

5.0 Care of the Boiler
8© Baxi Heating UK Ltd 2008
5.1 Cleaning the Outer case
The painted panels should be wiped with a damp cloth and
then dried completely. DO NOT USE ABRASIVE
CLEANING AGENTS.
5.2 Protection & Precaution
1. The boiler incorporates an integral frost protection feature
that will operate in both modes. If the boiler temperature falls
below 5° C, then the boiler will operate until the water
temperature has been raised.
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.
5.3 Fault Indication
1. If a fault occurs on the boiler an error code may be shown
on the facia display.
2. The codes are either two or three digit, preceded by the
letter 'E'. For example, code E133 will be displayed by 'E1'
alternating with '33'. E50 is shown as 'E' then '50'.
3. E20, E28, E50, E125 & E160 indicate faulty components.
You should make a note of the displayed error code and
contact your installer or service engineer.
4. If E110 or E130 is displayed overheat of the primary water
or flue system has occurred. Turn the selector switch to the
reset position and hold for at least 5 seconds. If the boiler
does not relight, or the code is displayed regularly contact your
installer or service engineer.
5. E119 is displayed when the primary water pressure is less
than 0.5 bar. After repressurising the system the boiler should
operate. Your installer will be able to advise you about the
method of repressurising. See page 6 for further details.
6. E133 indicates that the gas supply has been interrupted,
ignition has failed or the flame has not been detected. Ensure
that the gas supply has not been turned off, and turn the
selector switch to the reset position and hold for at least 5
seconds. If the boiler does not relight, or the code is displayed
regularly contact your installer or service engineer.
Central Heating NTC Fault
Flue NTC Fault
Hot Water NTC Fault
Safety Thermostat Operated
Water Pressure Switch Not Operated
Circulation Fault (Primary Circuit)
Flue NTC Operated
Interruption Of Gas Supply or Flame Failure
Fan or Fan Wiring Fault
E20
E28
E50
E110
E119
E125
E130
E133
E160
Table of Error Codes
bar
0
1
2
3
4
Display
Then
Fig. 5

6.0 Legislation
9
© Baxi Heating UK Ltd 2008
6.1 Installation, Commissioning, Service & Repair
1. This appliance must be install 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”.
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:-
1 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 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 Bodies 0085 & 0086.
For GB/IE only.
6.2 Benchmark Commissioning Checklist
1. 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.
Registered
Gas Installer
CARD SERIAL NO. 999999999
NAME:
A.N.Installer
COMPANY:
Newtown Heating
EXPIRES: 31 DECEMBER 2010
PHOTOGRAPH
To confirm validity of this card please contact
CORGI on 0870 401 2300
www.corgi-group.com
CORGI
00000
Fig. 6 CORGI Registration Card

7.0 Notes
10 © Baxi Heating UK Ltd 2008

8.0 Emergency
11
© Baxi Heating UK Ltd 2008
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).
In GB, 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.
Warning !
Gas Tap
Heating Flow, Heating
Return and Mains Water
Inlet Isolating Valves
Fig. 7
Fig. 8
In an Emergency
If a water or gas leak occurs or is suspected, the boiler can
be isolated at the inlet valves as follows;
1. Using a suitable open ended spanner, turn the square
nut on the gas tap through 90° (1/4turn) to isolate the gas
supply at the boiler (Fig. 7).
2. The water isolating valves are positioned under the
boiler and can be closed by turning their taps to the right
towards the wall (Fig. 8).
3. Call your Installer or Service Engineer as soon as
possible.

9.0 Warranty & Service
© Baxi Heating UK Ltd 2008
BAXI
A Trading Division of Baxi Heating UK Ltd (3879156)
A Division of Baxi Group
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
company
UK Comp No5122324 - Iss 4 - 1/08
Information 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.
Serial Number
Date of Installation
Installer Details (name, address and contact number(s))
Please complete the boxes below
DDMYY
M
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 731 1599.
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 CORGI 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
IT Comp No925.660.1