Potterton Promax Combi HE Plus A Range Instruction Manual

© Baxi Heating UK Ltd 2012
User Guide and
Important Warranty Information
Please keep these instructions in a safe place.
If you move house, please hand them over to
the next occupier.
Promax Combi
HE Plus A
Range
Condensing
Combination Boiler
You can rely on

2© Baxi Heating UK Ltd 2012
© Baxi Heating UK Ltd 2012 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,
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 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
Where fitted, user label for optional
timer to be applied here.
Natural Gas
Potterton Promax Combi 24 HE Plus A
G.C.No47 393 21
Potterton Promax Combi 28 HE Plus A
G.C.No47 393 22
Potterton Promax Combi 33 HE Plus A
G.C.No47 393 23
0086
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

1.0 Quick Reference Guide
3
© Baxi Heating UK Ltd 2012
Reset
bar
0
1
2
3
4
Reset
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.
Range 35 - 60° C.
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 shown when the
needle is in the GREEN section of the gauge, between 1 and 2.5 bar. If the pressure exceeds 3
bar (needle in the RED section) the safety pressure valve will operate and a fault is indicated.
Contact your Installer.
Reset
Reset
Central Heating & Hot Water
Both Heating & Hot Water will operate.
Reset
Hold for approx 5 seconds and release.
Display
Position of
Optional Timer
Reset
Domestic Hot Water
Hot Water will operate.

2.0 Troubleshooting
4© Baxi Heating UK Ltd 2012
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 and
the display lit ?
Is the ( ) or ( ) light on
and the ( ) on ?
Check electricity to the
boiler is switched on.
Reset
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 needle in the GREEN
section, 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.
Reset
Error Code E119 showing low
pressure.
NO
YES
YES
NO
If boiler does not
Reset

2.0 Troubleshooting
5
© Baxi Heating UK Ltd 2012
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 2012
bar
0
1
2
3
4
bar
0
1
2
3
4
Fig. 1
Fig. 2
Normal Pressure
Requires
Repressurising
Tap
Tap
Cap
Wing Nut
Loop Connected
Boiler Taps &
Connections, as
viewed from
underneath
3.1 Central Heating System Pressure
1. The water pressure in the central heating system is
indicated by the pressure gauge.
2. With the system cold and the boiler not operating the
pressure should be at least 0.5 bar. During operation the
pressure should not exceed 2.5 bar, and will normally be
between 1.0 and 2.0 (Fig. 1).
3. A pressure of 3 or greater indicates a fault. The safety
pressure relief valve will operate, at a pressure of 3 (Fig. 3). It
is important that your Installer or Service Engineer is
contacted as soon as possible.
4. The minimum pressure for correct operation is 0.5. If the
pressure falls below 0.5, this may indicate a leak on the
central heating system (Fig. 2). Error Code E119 will be
shown on the display.
3.2 To Re-Pressurise the System
(Optional Filling Loop)
1. The procedure is for the optional filling loop kit when
fitted. However, even if your boiler has an external loop, the
principle is similar.
2. Look at the boiler from underneath. There will be two taps
at the end of copper pipes, one with a blanking cap on the
end. Do not operate these taps yet.
3. Your installer will have left a metal braided hose (the ‘filling
loop’) with you for safe keeping.
4. This loop MUST be connected to the taps. Remove the
blanking cap and set aside.
5. Connect the loop to the taps with the wing nuts. These
should be hand tightened.
6. Carefully open the handles on both taps and check the
boiler pressure gauge. Once the needle on the gauge is
above the 0.5 mark both taps can be closed.
7. Undo the two wing nuts, remove the loop and refit the
blanking cap. Put the loop in a safe place for future use.
bar
0
1
2
3
4
Fault
Fig. 3

4.0 Clearances
7
© Baxi Heating UK Ltd 2012
Fig. 4
150mm 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
(Fig. 4):-
Top - 200mm
Bottom - 150mm
Left side - 5mm
Right Side - 5mm
Front - 5mm (In Operation)
- 450mm (For Servicing)
*This is the MINIMUM recommended dimension.
Greater clearance than this 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

5.0 Care of the Boiler
8© Baxi Heating UK Ltd 2012
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 (Fig. 5).
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
Reset
bar
0
1
2
3
4
Display
Then
Fig. 5

6.0 Legislation
9
© Baxi Heating UK Ltd 2012
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 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”.
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 Bodies 0086.
For GB/IE only.
6.2 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 Benchmark Checklist may be required in the event of
any warranty work.

7.0 Notes
10 © Baxi Heating UK Ltd 2012