Baxi Duo-tec Combi 24 HE A Instruction Manual

Please keep these instructions safe.
Should you move house, please hand
them over to the next occupier.
Baxi Platinum Combi HE Range
Gas Fired Wall Mounted Condensing
Combination Boiler
User’s Operating Instructions &
Important Warranty Information

2
Natural Gas
Baxi Platinum Combi 24 HE
G.C.No47 075 20
Baxi Platinum Combi 28 HE
G.C.No47 075 21
Baxi Platinum Combi 33 HE
G.C.No47 075 22
Warranty
heateam the service division of Baxi Heating UK Limited provide
a 5 year free warranty for your peace of mind. Once your boiler
is registered with us and in the unlikely event your boiler develops
a fault and your installer is unable to assist, heateam will provide a
free service to you provided the boiler is under 5 years old.
Otherwise heateam will offer a competitive fixed price repair rate
including parts, labour and VAT. To arrange an engineer visit
either in warranty or out, please call heateam on 08700 60 30 60.
It would help if you had your boiler serial number when you call,
the serial number is shown on the back cover of this guide.
Annual Service
To ensure you receive the maximum efficiency from your boiler
we recommend your boiler has an annual service so you and
your family can continue to enjoy heating and hot water comfort.
To arrange an annual service from one of our Baxi Heating UK
Limited heating experts, please call heateam on 08700 60 30 60
to arrange a visit convenient to you.
Benchmark Commissioning Check List
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.
5 Years Free Warranty - register today
To receive your 5 years free warranty please complete the form
supplied with the boiler or simply call heateam, the service
division of Baxi Heating UK Limited on 08700 60 30 60.
Baxi is one of the leading manufacturers of domestic
heating products in the UK.
Our first priority is to give a high quality service to our
customers. Quality is designed into every Baxi product -
products which fulfil the demands and needs of customers,
offering choice, efficiency and reliability.
To keep ahead of changing trends, we have made a
commitment to develop new ideas using the
latest technology - with the aim of continuing to
make the products that customers want to buy.
Everyone who works at Baxi has a commitment to quality
because we know that satisfied customers mean continued
success.
We hope you get a satisfactory service from Baxi. If not,
please let us know.
Baxi is a BS-EN ISO 9001
Accredited Company

1.0 Operating the Boiler
3
1.1 Operating the Boiler
The Central Heating and Hot Water you need will be
available when the gas and electricity supplies to the boiler
are turned on with the timer and other heating controls in
your system set correctly.
Other heating controls are items such as room
thermostats, cylinder thermostats and thermostatic
radiator valves. To give the most energy efficient
performance these controls can switch your boiler
on and off even when your timer is on. Instructions
on how to use your programmer and other
heating controls should have been supplied with
the items. Baxi Heating UK Limited also produce a
guide ‘How to get the best out of your NEW
Central Heating System’. Telephone our Literature
Hotline on 08706 060 623 to request your free
copy.
1. Ensure that the electricity and gas supplies are turned on.
Check that the central heating pressure is at least 0.5 bar
(Fig. 1).
2. Turn the On/Off/Reset selector switch either anti-
clockwise from the OFF position (Fig. 3) to both central
heating and domestic hot water or clockwise to domestic
hot water only.
3. In either position the display will illuminate showing the
current boiler temperature in degrees centigrade (Fig. 2).
4. Position (i) Heating and Hot Water (Fig. 4) In this
position the central heating will operate on demand from
the integral timer, room thermostat etc or domestic hot
water will be provided when a tap or shower is turned on.
Priority is given to domestic hot water. The central heating
indicator ( ) will illuminate when the boiler is supplying
central heating. If there is a demand for domestic hot water
the ( ) indicator will illuminate and the central heating
indicator ( ) will extinguish (Fig. 2). As the temperature
rises the display will change, showing the current boiler
output temperature.
5. Position (ii) Hot Water Only (Fig. 5) In this position only
hot water will be provided when a tap or shower is turned
on - Central Heating will not operate. The hot water
indicator ( ) will illuminate (Fig. 2).
6. The boiler will light automatically on demand.
7. The burner on indicator ( ) will illuminate when the
boiler is operating and the main burner has lit (Fig. 2).
IMPORTANT: When the selector switch is in the ‘0’
(Off) position the electrical supply to the boiler is
isolated. The boiler will not operate and the integral
timer will require resetting once the selector switch is
set to either Position (i) or Position (ii).
2
1
0
4
3
bar
R
1
2
3
4
5
PM
7
8
9
10
11
12
1
2
3
4
5
AM
7
8
9
10
11
12
GRASSLIN
0
Position (ii)
(Hot Water)
Fig. 4
Fig. 5
OFF Position
Fig. 3
Fig. 1
2
1
0
4
3
bar
Central Heating System
Pressure Gauge
Position (i)
(Central Heating or Hot Water)
On/Off/Reset
Selector Switch
Fig. 2
Central Heating
Temperature Control
Domestic Hot Water
Temperature Control
Central Heating
Indicator
Domestic Hot
Water Indicator
Burner On
Indicator
Current Boiler
Output
Temperature
Display
Timer

1.0 Operating the Boiler
4
1.2 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.
1.3 Resetting (Fig. 8)
1. To reset the boiler turn the selector switch fully
anticlockwise against the spring pressure for approximately
5 seconds and release.
1.4 Pump Protection
1. With the selector switch in either Position (i) or Position
(ii) (Figs. 7 & 9) the pump will automatically operate for 1
minute in every 24 hours to prevent sticking.
1.5 3-Way Valve - Anti-sticking
1. If there is no demand for heat in a 24 hour period, the 3-
way valve will be operated once to help prevent sticking.
Central Heating NTC Fault
Flue NTC Fault
Hot Water NTC Fault
Safety Thermostat Operated
Water Pressure Switch Not Operated
Pump Fault
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
2
1
0
4
3
bar
R
1
2
3
4
5
PM
7
8
9
10
11
12
1
2
3
4
5
AM
7
8
9
10
11
12
GRASSLIN
0
Display
Then
Fig. 6
Fig. 7
Fig. 9
Reset Position
Fig. 8
Position (ii)
(Hot Water)
Position (i)
(Central Heating or Hot Water)

1.0 Operating the Boiler
5
1.6 Temperature Control
1. Central Heating: The central heating hot water flow
temperature can be adjusted between 25° C minimum
and 80° C maximum.
2. Turn the control knob clockwise to increase the
temperature (Fig. 10). As the control knob is turned the
selected temperature is displayed for approximately 4
seconds. The display then reverts to the current boiler
output temperature.
3. In normal winter usage we recommend that the central
heating temperature be set at maximum.
4. Domestic Hot Water: The temperature of the domestic
hot water can be adjusted by turning the control knob
clockwise to increase up to a maximum of 60° C (Fig. 11).
As the control knob is turned the selected temperature is
displayed for approximately 4 seconds. The display then
reverts to the current boiler output temperature.
5. The temperature of the water is also dependent on the
water flow rate and the temperature of the mains coming
into the house.
6. By slightly reducing the flow from the tap the
temperature will increase up to the maximum if required.
7. The flow rate can be reduced down to as low as 2 litres
per minute. The boiler will still recognise the need to heat
the water.
Domestic Hot Water
Temperature Control
Fig. 10
Central Heating
Temperature Control
Fig. 11

1.0 Operating the Boiler
6
2
1
0
4
3
bar
2
1
0
4
3
bar
2
1
0
4
3
bar
2
1
0
4
3
bar
ON/OFF
Selector Switch
OFF Position
Fig. 16
Normal Pressure (when cold)
Normal Pressure (operating)
Fig. 12
Fault
Fig. 13
Below Minimum
Fig. 14
Fig. 15
Pressure Gauge 1.7 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 (Figs. 12 & 13).
3. A pressure of 3 or greater indicates a fault. The safety
pressure relief valve will operate, at a pressure of 3 (Fig.
14). 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. 15). Error Code E119 will be
shown on the display.
1.8 To Shut Off the Boiler
1. For short periods: Turn the selector switch to the OFF
position (Fig. 16).
2. For long periods: Turn off the selector switch (Fig.16),
electricity and gas supplies.
If your home is to be left unoccupied for long periods
during cold weather the boiler and whole system should
be drained unless there is additional frost protection.
3. Your installer will advise you about frost protection and
draining the system.
IMPORTANT: When the selector switch is in the ‘0’
(Off) position the electrical supply to the boiler is
isolated. The boiler will not operate and the integral
timer will require resetting once the selector switch is
set to either Position (i) or Position (ii).
1.9 Boiler Frost Protection Mode
1. The frost protection feature will operate when the
selector switch is in the central heating and domestic hot
water mode.
The gas and electrical supplies to the boiler must be on and
the system pressure must be within the range described
above.
2. If the system temperature falls below 5°C, then the
boiler will operate until the water temperature has been
raised.

2.0 Care of the Boiler
7
2.1 Servicing and Repair of your Boiler
heateam can service and repair your boiler if your installer
is not able to.
Our Baxi Heating UK Limited trained heating experts will
quickly get your heating and hot water working again. If
your boiler is out of its free 3 year period, heateam can
provide a competitive fixed price repair rate including parts,
labour and VAT.
To find out more call heateam on 08700 60 30 60, open
Monday to Friday 8am - 6pm, weekends and bank holidays
8.30am - 2pm, closed on Christmas and New Years Day.
An appointment convenient for you can be arranged. It
would help if you had your boiler serial number when you
call, the serial number is shown on the back cover of this
guide.
2.2 Cleaning the Outer case
The painted panels should be wiped with a damp cloth and
then dried completely.

3.0 Timer
8
3.1 Setting the Timer
The Electro-Mechanical Timer allows the central heating
system to be set every 15 minutes.
Using the three position switch the timer will allow either
constant operation, timed operation or central heating off.
Move the switch button by sliding to the desired position.
Three position switch (Fig. 17)
Constant (Top position): The heating will
be on constantly irrespective of the position
of the tappets.The heating will be controlled
by the main thermostat on the appliance
and/or any external controls.
Timed (Central position): The heating will
operate according to the position of the
tappets and be controlled as above.
0Off (Bottom position): No central heating.
Domestic hot water will operate on demand.
To set the time of day
Turn the timer outer bezel clockwise, to align the pointer
with the correct time to the nearest 15 minutes
ensuring that A.M./P.M. is considered.
Do not at any time attempt to turn the bezel anti-
clockwise.
To set the timed heating program
Decide which times of the day the central heating is
required.
The heating will operate when the white tappets are set to
the outer edge of the bezel.
To ensure the heating stays OFF set the required tappets
inwards towards the centre of the bezel.
Each tappet represents 15 minutes.
For example: If the heating is not required between
10 A.M. and 11 A.M. the four tappets anticlockwise from
the 10 A.M. will be set inwards (Fig. 18).
2
3
4
5
AM
7
8
9
10
N
0
9
10
11
12
1
2
3
4
5
PM
7
8
9
10
11
12
1
2
3
4
5
AM
7
8
9
10
11
12
GRASSLIN
0
4
Constant
Time Pointer
Timed
Off
Rotate to adjust time
Off Position
On Position
Time Pointer
Fig. 17
Fig. 18

4.0 Clearances
9
Fig. 19
Fig. 20
2
1
0
4
3
bar
R
1
2
3
4
5
PM
7
8
9
10
11
12
1
2
3
4
5
AM
7
8
9
10
11
12
GRASSLIN
0
200mm Min
780mm
450mm
200mm Min
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.19 & 20):-
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 Fault Finding/Emergency
10
No Heating/Hot Water
User to check
fault diagnosis
Contact your installer
Installer unable
to rectify fault
Contact heateam
Important information
you need to arrange
an appointment:
- Product serial number
- Make and model
- Installer details
- Proof of purchase
Contact
heateam
08706 60 30 60
Installer contacts
Help-line
In the unlikely event you have a problem with your boiler
please check the following.
1. Is the electricity supply to your boiler switched on
and the selector switch set to Central Heating and Hot
Water?
If so the Green ‘Power On’ neon will be on.
2. Is a fault suggested by the neon indicators?
Yes - Identify as described on Page 4.
No - Continue below
3. Is the gas supply turned on?
4. Is the mains water supply turned on?
5. Is the system pressure correct?
6. Is the programmer or timer switch set to On?
Refer to the instruction booklet supplied with these
items for correct setting and operation.
7. Are the temperature controls on the boiler turned
on and set high enough?
8. Are all system controls such as room and cylinder
thermostats set high enough?
9. Are the thermostatic radiator valves set high enough?
Contact your Installer
If you have followed the steps in this simple checklist but
your boiler still does not fire contact your installer.
Any repairs to the boiler will usually be the responsibility of
the Installer during the warranty period.
Installer Help-line
Should your installer need assistance he/she can contact our
trade support help-line for diagnostic and remedy advice.