Vaillant HOME COMBI 25 - A (H-GB) User manual

For the operator
Operating instructions
HOME
COMBI
GB, IE
Operating instructions
Publisher/manufacturer
Vaillant GmbH
Berghauser Str. 40 D-42859 Remscheid
Tel. [phone]‑0 Fax [phone]‑28 10
[email protected] www.vaillant.de

Contents
2Operating instructions HOME 0020224354_00
Contents
1 Safety ............................................ 3
1.1 Action-related warnings ................. 3
1.2 Intended use .................................. 3
1.3 General safety information............. 4
2 Notes on the documentation ...... 7
2.1 Observing other applicable
documents ..................................... 7
2.2 Storing documents......................... 7
2.3 Applicability of the instructions....... 7
3 Product description..................... 7
3.1 CE label ......................................... 7
3.2 Serial number ................................ 7
3.3 Information on the identification
plate ............................................... 7
3.4 Product design............................... 8
3.5 Overview of the operator control
elements ........................................ 8
3.6 Description of the display............... 9
3.7 Description of button functions ...... 9
3.8 Timer............................................ 10
3.9 Operating levels........................... 10
4 Operation.................................... 10
4.1 Starting up the product ................ 10
4.2 Basic display................................ 10
4.3 Checking the heating system
pressure....................................... 10
4.4 Filling the heating installation....... 11
4.5 Selecting the operating mode ...... 11
4.6 Setting the hot water
temperature ................................. 11
4.7 Setting the heating flow
temperature ................................. 12
4.8 Product settings ........................... 12
4.9 Setting the timer........................... 12
4.10 Switching the product to
standby mode .............................. 13
4.11 Frost protection............................ 13
5 Troubleshooting ........................ 13
5.1 Detecting and rectifying faults...... 13
5.2 Fault codes in the display ............ 14
6 Care and maintenance .............. 14
6.1 Maintenance ................................ 14
6.2 Caring for the product .................. 14
6.3 Checking the condensate drain
pipework and tundish................... 14
7 Decommissioning...................... 14
7.1 Temporarily decommissioning
the product................................... 14
7.2 Permanently decommissioning
the product................................... 14
8 Recycling and disposal............. 14
9 Guarantee and customer
service ........................................ 15
9.1 Guarantee.................................... 15
9.2 Customer service......................... 15
Appendix ............................................... 16
A Operator level –overview ......... 16
B Troubleshooting ........................ 16

Safety 1
0020224354_00 HOME Operating instructions 3
1 Safety
1.1 Action-related warnings
Classification of action-re-
lated warnings
The action-related warnings
are classified in accordance
with the severity of the pos-
sible danger using the following
warning signs and signal words:
Warning symbols and signal
words
Danger!
Imminent danger to life
or risk of severe personal
injury
Danger!
Risk of death from electric
shock
Warning.
Risk of minor personal
injury
Caution.
Risk of material or envir-
onmental damage
1.2 Intended use
There is a risk of injury or death
to the user or others, or of dam-
age to the product and other
property in the event of im-
proper use or use for which it
is not intended.
The product is intended as a
heat generator for closed cent-
ral heating installations and for
hot water generation.
Intended use includes the fol-
lowing:
–observance of the operating
instructions included for the
product and any other system
components
–compliance with all inspection
and maintenance conditions
listed in the instructions.
This product can be used by
children aged from 8 years
and above and persons with
reduced physical, sensory or
mental capabilities or lack of
experience and knowledge if
they have been given supervi-
sion or instruction concerning
use of the product in a safe way
and understand the hazards in-
volved. Children must not play
with the product. Cleaning and
user maintenance work must
not be carried out by children
unless they are supervised.
Any other use that is not spe-
cified in these instructions, or
use beyond that specified in this
document shall be considered
improper use. Any direct com-
mercial or industrial use is also
deemed to be improper.
Caution.
Improper use of any kind is
prohibited.

1 Safety
4Operating instructions HOME 0020224354_00
1.3 General safety
information
1.3.1 Installation by skilled
tradesmen only
The installation, inspection,
maintenance and repair of the
product, as well as the gas ratio
settings, must only be carried
out by a competent person.
1.3.2 Danger caused by
improper operation
Improper operation may present
a danger to you and others, and
cause material damage.
▶Carefully read the enclosed
instructions and all other ap-
plicable documents, particu-
larly the "Safety" section and
the warnings.
1.3.3 Risk of death from
escaping gas
What to do if you smell gas in
the building:
▶Avoid rooms that smell of
gas.
▶If possible, open doors and
windows fully and ensure
adequate ventilation.
▶Do not use naked flames (e.g.
lighters, matches).
▶Do not smoke.
▶Do not use any electrical
switches, mains plugs, door-
bells, telephones or other
communication systems in
the building.
▶If it is safe to do so, close the
emergency control valve or
the main isolator.
▶If possible, close the gas isol-
ator cock on the product.
▶Warn other occupants in the
building by yelling or banging
on doors or walls.
▶Leave the building immedi-
ately and ensure that others
do not enter the building.
▶Notify the gas supply com-
pany or National Grid Transco
[phone] by tele-
phone from outside of the
building.
1.3.4 Risk of death due to a
blocked or leaking flue
gas pipe
What to do if you smell flue gas
in the property:
▶Open all accessible doors
and windows fully to provide
ventilation.
▶Switch off the product.
▶Inform a competent person.
1.3.5 Risk of death from
escaping flue gas
If you operate the product with
an empty condensate siphon,
flue gas may escape into the
room air.

Safety 1
0020224354_00 HOME Operating instructions 5
▶In order to operate the
product, ensure that the con-
densate siphon is always full.
1.3.6 Risk of death due to
explosive and flammable
materials
▶Do not use or store explosive
or flammable materials (e.g.
petrol, paper, paint) in the in-
stallation room of the product.
1.3.7 Risk of death due to lack
of safety devices
A lack of safety devices (e.g.
expansion relief valve, expan-
sion vessel) can lead to poten-
tially fatal scalding and other
injuries, e.g. due to explosions.
▶Ask a competent person
to explain how the safety
devices work and where they
are located.
1.3.8 Risk of death due
to changes to the
product or the product
environment
▶Never remove, bridge or
block the safety devices.
▶Do not alter the safety
devices in any way.
▶Do not damage or remove
any seals on components.
▶Do not make any changes:
–The product itself
–to the gas, air, water and
electricity supplies
–to the entire flue gas install-
ation
–to the entire condensate
drain system
–to the expansion relief valve
–to the drain lines
–to constructional condi-
tions that may affect the
operational reliability of the
product
1.3.9 Risk of injury and
material damage due to
maintenance and repairs
carried out incorrectly or
not carried out at all
▶Never attempt to carry out
maintenance work or repairs
on your product yourself.
▶Faults and damage should
be immediately rectified by a
competent person.
▶Adhere to the maintenance
intervals specified.
1.3.10 Risk of corrosion
damage due to
unsuitable combustion
and room air
Sprays, solvents, chlorinated
cleaning agents, paint, adhes-
ives, ammonia compounds,
dust or similar substances may
lead to corrosion on the product
and in the air/flue pipe.

1 Safety
6Operating instructions HOME 0020224354_00
▶Ensure that the supply of
combustion air is always free
of fluorine, chlorine, sulphur,
dust, etc.
▶Ensure that no chemical sub-
stances are stored at the in-
stallation site.
1.3.11 Risk of material
damage caused by
frost
▶Ensure that the heating in-
stallation always remains in
operation during freezing con-
ditions and that all rooms are
sufficiently heated.
▶If you cannot ensure the op-
eration, have a competent
person drain the heating in-
stallation.

Notes on the documentation 2
0020224354_00 HOME Operating instructions 7
2 Notes on the
documentation
2.1 Observing other applicable
documents
▶You must observe all operating instruc-
tions enclosed with the system compon-
ents.
2.2 Storing documents
▶Keep this manual and all other applic-
able documents safe for future use.
2.3 Applicability of the
instructions
These instructions apply only to:
Product article number
Article num-
ber
Gas Council
Number
HOME
COMBI 25 -
A (H-GB)
0010019930 47-044-62
HOME
COMBI 30 -
A (H-GB)
0010019931 47-044-63
HOME
COMBI 35 -
A (H-GB)
0010019932 47-044-64
These products are only designed for nat-
ural gas systems.
3 Product description
3.1 CE label
The CE label shows that the products
comply with the basic requirements of the
applicable directives as stated on the iden-
tification plate.
The declaration of conformity can be
viewed at the manufacturer's site.
3.2 Serial number
The serial number is on the identification
plate on the underside of the product.
3.3 Information on the
identification plate
The identification plate is mounted on the
underside of the product in the factory.
The identification plate keeps record of
the country in which the product is to be
installed.
Information
on the identi-
fication plate
Meaning
Barcode with serial number
Serial number For quality control purposes;
3rd and 4th digits = year of
production
For quality control purposes;
5th and 6th digits = week of
production
For identification purposes;
7th to 16th digits = product
article number
For quality control purposes;
17th to 20th digits = place of
manufacture
HOME COMBI Product description
XX, Gxx –
xx mbar
(x kPa)
Gas group and gas connec-
tion pressure as set at the
factory
Cat. Approved gas category
Condensing
technology
Efficiency class of the boiler
in accordance with EC Dir-
ective 92/42/EEC
Type: Xx3(x) Permissible flue gas connec-
tions
PMS Maximum water pressure in
heating mode
PMW Maximum water pressure in
hot water handling mode
V/Hz Electric connection
W Max. electrical power con-
sumption

3 Product description
8Operating instructions HOME 0020224354_00
Information
on the identi-
fication plate
Meaning
IP Level of protection
Heating mode
Hot water generation
Pn Nominal heat output range
in heating mode
Pnc Nominal heat output range
in heating mode (condensing
technology)
P Nominal heat output range
in hot water handling mode
Qn Nominal heating load range
in heating mode
Qnw Nominal heating load range
in hot water handling mode
Tmax. Max. flow temperature
NOx NOx class for the product
Code (DSN) Specific product code
→"CE label" section
Read the instructions.
→"Recycling and disposal"
section
GC no. Gas council number
3.4 Product design
1
1 Control elements
3.5 Overview of the operator
control elements
1
2
34
5
1 Display
2button
3button
4button
5button

Product description 3
0020224354_00 HOME Operating instructions 9
3.6 Description of the display
1
2
3
1 Operating in-
formation
2 Active operating
mode, selecting
and confirming
the operating
mode
3 Display showing
the current heat-
ing flow temper-
ature, the filling
pressure in the
heating install-
ation, the oper-
ating mode or a
fault code
Symbol Meaning
Burner operating correctly
–Burner on
Heating installation filling
pressure
–Permanently on: Filling
pressure in the permitted
range.
–Flashing display: Filling
pressure is outside of the
permissible range or the
purging function has been
activated.
DHW mode
–Permanently on: Hot wa-
ter activated
–Flashing: Burner on in
draw-off mode
Hot water saving mode
–Normal operating temper-
ature
–Warm start for hot water
deactivated
Symbol Meaning
Heating mode
–Permanently on: Heating
mode activated
–Flashing: Burner on in
heating mode
Display flashing:
–Switching on the product
–Fault
Setting confirmed
/Fault in the product
–Appears instead of the
basic display.
OFF –Appears when the
product goes into standby
mode.
3.7 Description of button
functions
Button Meaning
–Selecting the operating mode
–Confirm the operating mode
–Confirm setting
–Increase the display contrast
or –Setting the hot water temperat-
ure
–Setting the heating flow tem-
perature
–Increase or decrease the selec-
ted setting
–Increase the display contrast
–Activate the product: On/off
(standby)
–Reset the product
Adjustable values flash on the display.
You must confirm any change to a value.
Only then is the new setting saved.
If you do not press any buttons for five
seconds, the displays switches back to
the basic display.
If you do not press any buttons for one
minute, the display contrast decreases.

4 Operation
10 Operating instructions HOME 0020224354_00
3.8 Timer
Applicability: Timer
You can control the heating mode using
the timer.
Position for
the selection
switch
Functionality
0Heating mode permanently
switched off
Heating mode intervals in
accordance with the timer
IHeating mode permanently
switched on
▶Set the timer. (→Page 12)
3.9 Operating levels
The product has two operating levels:
–The operator level shows the most im-
portant information and offers set-up
options which do not require any special
prior knowledge.
–Specialised knowledge is required in or-
der to use the installer level (access for
competent persons). This is therefore
protected by an access code.
Operator level –overview (Applicability:
Combination unit) (→Page 16)
4 Operation
4.1 Starting up the product
4.1.1 Opening the isolator devices
Conditions: The competent person who installed
the unit will explain where the isolator devices are
and how to handle them.
▶Ensure that the gas isolator cock is fully
open.
▶Ensure that the stop cocks in the heat-
ing installation's flow and return are
open.
▶Ensure that the cold water stop cock is
open.
4.1.2 Starting up the product
12
▶Press the (2) button.
◁When the unit is switched on, the
"Basic display" is shown in the
display (1).
4.2 Basic display
The filling pressure in the heating installa-
tion and the operating mode are shown in
the display's basic display.
To return to the basic display:
–Wait more than five seconds without
pressing any buttons.
If a fault message is present, the basic
display switches to the fault code.
4.3 Checking the heating system
pressure
1. Once a month, check that the pressure
in the central heating system, which
is displayed on the user interface,
is between 0.1 MPa and 0.15 MPa
(1.0 bar and 1.5 bar).
◁If the filling pressure is correct, no
action needs to be taken.
▽If the filling pressure is too low, add
more water to the heating installa-
tion.

Operation 4
0020224354_00 HOME Operating instructions 11
Note
If the heating flow temperature
is shown in the display, press
and hold the and buttons
at the same time for longer than
five seconds, or temporarily
deactivate heating mode in
order to display the pressure.
2. Fill the heating installation. (→Page 11)
4.4 Filling the heating installation
Caution.
Risk of material damage due
to heating water that is ex-
tremely calciferous or corros-
ive or contaminated by chem-
icals.
Unsuitable tap water damages
the seals and diaphragms,
blocks components in the
product and heating installation
through which the water flows
and causes noise.
▶Only fill the heating install-
ation with suitable heating
water.
▶In case of doubt, ask a com-
petent person for details.
Note
The competent person is respons-
ible for filling the heating installa-
tion the first time, any subsequent
top-ups and the water quality.
The operator alone is respons-
ible for topping up the water in the
heating installation.
1. Open all radiator valves (thermostatic
radiator valves) of the heating installa-
tion.
2. Slowly open the filling cock, as shown
to you by the competent person.
3. Fill with water until the required filling
pressure is reached.
4. Check the filling pressure in the
display.
5. Close the filling cock after filling.
4.5 Selecting the operating mode
Note
The unit is always activated with
the preselected operating mode.
▶Press repeatedly until the display
shows the required operating mode.
Symbol Operating mode
+
Heating + hot water
Heating only
Hot water only
‒No requirement
4.6 Setting the hot water
temperature
Applicability: Combination unit
Conditions: The temperature is controlled by the
boiler
▶Set the hot water temperature on the
boiler (→Page 12).
Conditions: The temperature is controlled by the
controller
▶Set the hot water temperature on the
controller.
Note
If you press the or but-
ton, the display shows the
symbol.

4 Operation
12 Operating instructions HOME 0020224354_00
4.6.1 Switching the warm start
function on and off
Applicability: Combination unit, Available warm
start function for hot water
▶Hold the buttons down simultan-
eously for more than 3 seconds.
◁If is shown in the display, the
warm start function is deactivated.
◁If is not shown in the display,
the warm start function is activated.
Note
The preheating function is made
available by a suitably special-
ised installer.
4.7 Setting the heating flow
temperature
Applicability: Combination unit
Conditions: Temperature controlled by the boiler,
with heating mode activated
▶Set the heating flow temperature on
the boiler (→Page 12).
Note
The competent person may
have adjusted the maximum
possible temperature.
Applicability: Controller
Conditions: Temperature controlled by the con-
troller, with heating mode activated
▶Set the maximum heating flow tem-
perature on the boiler (→Page 12).
▶Set the room temperature on the
controller.
◁The actual heating flow temper-
ature is set automatically by the
controller.
Applicability: External sensor
Conditions: Outside temperature sensor connec-
ted to the boiler, with heating mode activated
▶When you press the , or but-
ton.
◁The display shows the heating
flow temperature calculated by the
boiler.
◁The actual heating flow temper-
ature is set automatically by the
boiler.
4.8 Product settings
Note
The sequence in which the avail-
able settings are shown depends
on the operating mode selected.
If the Domestic hot water + Heat-
ing operating mode is selected,
the hot water temperature must be
confirmed in order to set the flow
temperature of the heating.
1. Press the or button to set the tem-
perature.
2. Press the button to confirm.
4.9 Setting the timer
Applicability: Timer, Great Britain
1
5
6
2
3
4
1. Turn the minute hand (4) clockwise
until the arrow (2) points to the current
time on the 24-hour dial (3).

Troubleshooting 5
0020224354_00 HOME Operating instructions 13
2. Slide the pin for the time interval, in
which the heating mode should be
switched on, outwards (6).
3. Slide the pin for the time interval, in
which the heating mode should be
switched off, inwards (5).
4. Set the selection switch (1) to the mid-
position .
4.10 Switching the product to
standby mode
▶Press the button for less than three
seconds.
◁Once the requirement currently in
use has finished, the display will
show OFF and go out.
◁The product is now in standby mode.
◁The product's frost protection func-
tion is activated.
◁The main power supply is not inter-
rupted. The product continues to be
supplied with power.
4.11 Frost protection
4.11.1 The product's frost
protection function
The frost protection function switches on
the boiler and the pump as soon as the
protection temperature in the heating cir-
cuit is reached.
–Protection temperature: 12 ℃
The pump stops once the minimum wa-
ter temperature in the heating circuit is
reached.
–Minimum water temperature: 15 ℃
If the burner ignition temperature in the
heating circuit is reached, the burner
switch is switched on and continues
to operate until the burner anti-cycling
temperature is reached.
–Burner ignition temperature: 7 ℃
–Burner anti-cycling temperature: 35 ℃
The hot water circuit (cold and hot water)
is not protected by the boiler.
Frost protection for the system can only be
guaranteed by the boiler.
A controller is required to control the tem-
perature of the system.
4.11.2 Frost protection for the
system
Note
Ensure that the product's power
and gas supply are working cor-
rectly.
Conditions: If you are away from home for several
days, Without controller
▶Switch the product to standby mode.
(→Page 13)
Conditions: If you are away from home for several
days, With controller
▶Program the number of days you will
be away in the controller to activate the
frost protection devices.
Conditions: If you are away from home for a pro-
longed period
▶Contact a qualified competent person,
who can completely drain the system or
protect the heating circuit by adding a
special frost protection agent for heating
installations.
5 Troubleshooting
5.1 Detecting and rectifying faults
▶If problems occur whilst operating the
product, you can carry out certain self-
checks with the aid of the table in the
appendix.
Troubleshooting (→Page 16)
▶If the product still does not function
without problems after the checks have
been carried out using the table, con-
tact your competent person to rectify
the problem.

6 Care and maintenance
14 Operating instructions HOME 0020224354_00
5.2 Fault codes in the display
Fault codes have priority over all other dis-
plays. If several faults occur at the same
time, the corresponding codes are dis-
played alternately for two seconds each.
▶If your product displays a fault code
(F.xx), contact a competent person.
6 Care and maintenance
6.1 Maintenance
An annual inspection of the product carried
out by a competent person is a prerequis-
ite for ensuring that the product is perman-
ently ready and safe for operation, reliable,
and has a long working life.
6.2 Caring for the product
Caution.
Risk of material damage
caused by unsuitable clean-
ing agents.
▶Do not use sprays, scouring
agents, detergents, solvents
or cleaning agents that con-
tain chlorine.
▶Clean the casing with a damp cloth and
a little solvent-free soap.
6.3 Checking the condensate
drain pipework and tundish
The condensate drain pipework and tun-
dish must always be penetrable.
▶Regularly check the condensate drain
pipework and tundish for faults and,
particularly, for blockages.
You must not be able to see or feel any
obstructions in the condensate drain pipe-
work and tundish.
▶If you notice a fault, have it rectified by
a competent person.
7 Decommissioning
7.1 Temporarily decommissioning
the product
▶Temporarily decommission the product
only if there is no risk of frost.
▶Switch off the product via the main
switch provided on-site.
◁The display goes out.
▶When decommissioning for an exten-
ded period (e.g. holiday), you should
also close the gas isolator cock and the
cold water stop cock.
7.2 Permanently
decommissioning the product
▶Have a competent person permanently
decommission the product.
8 Recycling and disposal
▶The competent person who installed
your product is responsible for the dis-
posal of the packaging.
If the product is identified with this
symbol:
▶In this case, do not dispose of the
product with the household waste.
▶Instead, hand in the product to a collec-
tion centre for old electrical or electronic
appliances.
If the product contains batteries that
are marked with this symbol, these bat-
teries may contain substances that are
hazardous to human health and the envir-
onment.
▶In this case, dispose of the batteries at
a collection point for batteries.

Guarantee and customer service 9
0020224354_00 HOME Operating instructions 15
9 Guarantee and customer
service
9.1 Guarantee
–Two year guarantee
Vaillant provides this appliance with a
parts and labour guarantee against defects
that may occur within twenty-four months
of the installation date. For the 2nd year of
the guarantee to be valid an annual ser-
vice must be carried out by a competent
person approved at the time by the Health
and Safety Executive one year after install-
ation. The cost of this annual service is not
included in the guarantee.
–Registering with us
Registration is simple. Just complete the
Guarantee Registration Card and return to
Vaillant within 30 days of installation. Your
details will then be automatically registered
within the Vaillant scheme.
–Immediate help
If your Vaillant boiler develops a fault your
first action should be to contact your in-
staller, as his professional assessment is
needed under the terms of our Guarantee.
If you are unable to contact your installer,
phone Vaillant Service Solutions: 0870
6060 777
9.2 Customer service
To ensure regular servicing, it is strongly
recommended that arrangements are
made for a Maintenance Agreement.
Please contact Vaillant Service Solutions
for further details.
Vaillant Service Solutions: 0330 100 3461

Appendix
16 Operating instructions HOME 0020224354_00
Appendix
A Operator level –overview
Applicability: Combination unit
Setting level Values Unit Increment, select Default set-
ting
Min. Max.
Heating installation
Pressure in the heating in-
stallation
Current value bar 0.1
1 1.5
Heating flow temperature Current value ℃1 60
10 Preset
in the
system
Hot water generation
Hot water temperature Current value ℃1 55
35 60
Eco hot water temperature Current value ℃1
35 50
B Troubleshooting
Fault Cause Measure
Product does not
start up:
–No hot water
–Heating does
not heat up
The gas isolator cock installed on-site
and/or the gas isolator cock on the
product is closed.
Open both gas isolator cocks.
The cold water stop cock is closed. Open the cold water stop cock.
The power supply in the building is dis-
connected.
Check the fuse in the build-
ing. The product automatically
switches on after the power
supply is restored.
The product is switched off. Switch on the product (→"Switch-
ing on the product" section).
The heating flow temperature or hot
water temperature has been set too
low.
Set the heating flow temperat-
ure and hot water temperature (→
"Setting the heating flow temper-
ature" section/→"Setting the hot
water temperature" section).
The system pressure is insufficient.
Low water pressure in the heating in-
stallation (fault code: F.22).
Fill the heating installation (→
"Filling the heating installation"
section).
If the pressure drops frequently,
contact your competent person
about this.

Appendix
0020224354_00 HOME Operating instructions 17
Fault Cause Measure
Product does not
start up:
–No hot water
–Heating does
not heat up
The system pressure is too high. Purge a radiator in order to re-
duce the pressure in the heating
installation, or contact your com-
petent person about this.
There is air in the heating installation. Purging the radiators
If the problem occurs again: In-
form the competent person
After three successive failed ignition
attempts, the system switches to fault
mode (fault code: F.28).
Press the button. The product
carries out a new ignition attempt.
If the ignition problem is not rec-
tified after three fault clearance
attempts, contact a competent
person.
Hot water gener-
ation functioning
correctly; heating
does not start up.
The external controller is not set cor-
rectly.
Set the external controller cor-
rectly (→Controller operating in-
structions).

0020224354_00 14.10.2015
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