Viessmann B1HA User manual

Operating Instructions
VITODENS

100-W
5784 570 - 06 01/2018
Vitodens 100-W B1HA/B1KA
Models 26 to 125
Wall-Mounted, gas-fired condensing boilers
On demand domestic hot water with Combi boiler
Read and save these instructions
for future reference.
IMPORTANT
Please file in Service Binder
Heating input: 21 to 125 MBH
6.2 to 36.6 kW
WARNING
If the information in this manual is not followed
exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
WARNING
Improper installation, adjustment, and/
or operation could cause carbon monoxide
poisoning resulting in injury or loss of life.
This product must be installed and serviced
by a professional service technician who is
experienced and qualified in hot water boiler
installation and gas combustion.
Do not store or use gasoline or other
flammable liquids in the vicinity of this
or any other appliance.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliances.
Do not touch any electrical switches,
do not use any phone in your building.
Immediately call your gas supplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
If you cannot reach your gas supplier,
call the fire department.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
H

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5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
Safety, Installation and Warranty Requirements
Please ensure that these instructions are read and understood before commencing installation. Failure to comply with
the instructions listed below and details printed in this manual can cause product/property damage, severe personal
injury, and/or loss of life. Ensure all requirements below are understood and fulfilled (including detailed information
found in manual subsections).
Safety, Installation and Warranty Requirements
WARNING
Installers must follow local regulations with respect
to installation of carbon monoxide detectors. Follow
manufacturer’s maintenance schedule of the boiler
contained in “Service Instructions” manual.
Product documentation
Read all applicable documentation before commencing
installation. Store documentation near boiler in a
readily accessible location for reference in the future
by service personnel.
For a listing of applicable literature,
please see section entitled “Important
Regulatory and Safety Requirements”.
Warranty
Information contained in this and
related product documentation must
be read and followed. Failure to do
so renders the warranty null and void.
Licensed professional heating contractor
The installation, adjustment, service and maintenance
of this equipment must be performed by a licensed
professional heating contractor.
Please see section entitled
“Important Regulatory and Installation
Requirements”.
Contaminated air
Air contaminated by chemicals can cause by-products
in the combustion process, which are poisonous to
inhabitants and destructive to
Viessmann equipment.
For a listing of chemicals which
cannot be stored in or near the
boiler room, please see subsection
entitled “Combustion Air Supply”.
Advice to owner
Once the installation work is complete, the heating
contractor must familiarize the system operator/
ultimate owner with all equipment, as well as safety
precautions/requirements, shutdown procedure, and
the need for professional service annually before the
heating season begins.
Carbon monoxide
Improper installation, adjustment, service and/or
maintenance can cause flue products to flow into
living space. Flue products contain poisonous carbon
monoxide gas.
For information pertaining to the
proper installation, adjustment, service
and maintenance of this equipment to
avoid formation of carbon monoxide,
please see instructions supplied with
burner.
Fresh air
This equipment requires fresh air for
safe operation and must be installed
ensuring provisions for adequate
combustion and ventilation air exist.
For information pertaining to the
fresh air requirements of this product,
please see subsection entitled
“Combustion Air Supply”.
Equipment venting
Never operate boiler without an installed venting
system. An improper venting system can cause
carbon monoxide poisoning.
For information pertaining to
venting and chimney requirements,
please see section entitled “Venting
Connection”. All products of
combustion must be safely vented
to the outdoors.

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5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating Table of Contents
Safety, Installation and Warranty Requirements............. 2
About these Instructions ............................................ 4
For your Safety ......................................................... 4
Operation ............................................................. 4
Flue gas smell ....................................................... 4
Working on the equipment ...................................... 4
Dangerous conditions............................................. 4
Maintenance and cleaning....................................... 4
Technical Information............................................. 4
Carbon monoxide .................................................. 5
For safe operation.................................................. 5
Frozen water pipe hazard........................................ 6
Installation area conditions...................................... 7
Sources of combustion and ventilation air ..............
contaminants ........................................................ 7
Energy saving tips ................................................. 7
Overview of Controls and Indicators ........................... 8
Display indicators and operating buttons................... 8
On-screen buttons for operation .............................. 8
Default display ...................................................... 8
Operating Mode of the Heating System........................ 9
Starting the Heating System ....................................... 9
Shutting Down the Heating System .......................... 10
Stopping Central Heating and DHW Heating.................10
Setting the Central Heating Temperature .....................11
Setting the Heating Curve ....................................... 12
Adjusting the Heating Curve .................................... 12
Adjusting the Heating Curve Set Point ....................... 13
DHW Temperature ................................................. 14
Rooms are too Cold ..................................................15
Rooms are too Hot ...................................................15
There is no Hot Water...............................................16
DHW is too Hot .......................................................16
 and Fault Code Flashes on the Display ....................16
 is Shown on the Display........................................16
Fault Messages on the Display ...................................17
Resetting a Burner Fault ............................................17
Cleaning..................................................................18
Inspection and Maintenance ......................................18
Terminology ............................................................19
Lighting and Operating Instructions.............................20
Safety, Installation and Warranty
Requirements
Safety
Start-up
Operation
Troubleshooting
Maintenance
Information
Page

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
About these Instructions
Take note of all symbols and notations intended to draw attention to potential hazards or important product
information. These include “WARNING”, “CAUTION”, and “IMPORTANT”. See below.

IMPORTANT
CAUTION
Warnings draw your attention to the presence of
potential hazards or important product information.
Cautions draw your attention to the presence of
potential hazards or important product information.
Helpful hints for installation, operation or maintenance
which pertain to the product.
This symbol indicates that additional, pertinent
information is to be found.
This symbol indicates that other instructions must
be referenced.
Safety
For your Safety
Operation
Before operating the boiler, make sure you fully
understand its method of operation. Your heating
contractor should always perform the initial start-up and
explain the system. Any warranty is null and void if these
instructions are not followed.
Flue gas smell
- Deactivate heating equipment.
- Open windows and doors.
- Inform your heating contractor immediately.
Working on the equipment
All personnel working on the equipment or the heating
system must have the proper qualifications and hold all
necessary licenses.
Ensure main power to equipment, heating system, and all
external controls have been deactivated. Close main gas
supply valve. Take precautions in all instances to avoid
accidental activation of power during service work.
Dangerous conditions
- Deactivate main power immediately.
- Close gas supply valve.
Maintenance and cleaning
Regular inspection and service by a qualified heating
contractor is important to the performance of the
Viessmann Vitodens 100-W. Neglected maintenance
impacts on warranty; regular inspection ensures clean,
environmentally friendly and efficient operation. We
recommend a maintenance contract with a qualified
heating contractor.
Technical information
- Technical Data Manual
- Installation and Service Instructions
- Operating Instructions and User’s Information Manual
- Vitodens Venting System Installation Instructions
-Quick Start-up Guide
- Instructions of other products utilized and installed
- Installation codes mentioned in this manual
WARNING
Indicates an imminently hazardous situation which,
if not avoided, could result in death, serious injury
or substantial product/property damage.
Indicates an imminently hazardous situation which,
if not avoided, may result in minor injury or product/
property damage.

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating Safety
For your Safety (continued)
WARNING
As there are no user-serviceable parts on the boiler,
burner or control, the end-user must not perform
service activities or adjustments of any kind on system
components. Failure to heed this warning can cause
property damage, severe personal injury, or loss of life.
WARNING
Improper installation, adjustment, service, or
maintenance can cause flue products to flow into
living space. Flue products contain poisonous carbon
monoxide gas which can cause nausea or asphyxiation
resulting in severe personal injury or loss of life.
WARNING
The operator/ultimate owner is required to have the
heating boiler, burners, and controls checked, as a
minimum once per year, by the original installer or
by a competent heating contractor familiar with the
equipment. Defects must be corrected immediately.
Carbon monoxide
The U.S. Consumer Product Safety Commission
strongly recommends the installation of carbon
monoxide detectors in buildings in which gas-burning
equipment is installed. Carbon monoxide (CO) is a
colorless, odorless gas, which may be produced during
incomplete combustion of fuel and/or when the flame
does not receive an adequate supply of combustion air.
Carbon monoxide can cause severe personal injury or
loss of life.
Therefore, carbon monoxide detectors that are in
compliance with a nationally recognized standard
(e.g. ANSI/UL 2034, CSA 6.19 - latest editions)
should be installed and maintained in buildings that
contain gas-burning equipment.
Note: Viessmann does not test any detectors and
makes no representation regarding any brand
or type of detector.
For safe operation
We recommend that you frequently:
- Check for debris which could obstruct the flow of
flue gases. The vent or chimney must not be blocked.
A blocked or partially blocked vent or chimney can
cause flue gases to leak into the structure. Flue
gases leaking into the house can cause injury or
death. A qualified heating contractor must remove
the blockage from blocked or partially blocked
chimneys.
- Check pressure gage for correct system (water)
pressure. Check for water on the floor from the
discharge pipe of the pressure relief valve or any
other pipe, pipe joint, valve or air vent.
- Check for moisture, water, or appearance of rust
on the flue gas pipes, their joints as well as vent
dampers, or side wall vent terminals (if so equipped).
- Ensure that nothing is obstructing the flow of
combustion and ventilation air and no chemicals,
garbage, gasoline, combustible materials, flammable
vapors and liquids are stored (not even
temporarily) in the vicinity of the boiler.
- Do not allow unsupervised children near the boiler.
Service/inspection of the boiler and the system is
recommended once per year. Maintenance, service
and cleaning are specified in the Installation and
Service Instructions.
Before the heating season begins, it is recommended
that the boiler and burner be serviced by a qualified
heating contractor. Service contracts may be
established through gas suppliers or other licensed
contractors in your area.
Do not use this boiler if any part has been under water.
Immediately call a qualified heating contractor to
inspect the boiler and to replace any part of the control
system and any gas control which has been under water.
CAUTION
Should overheating occur or the gas supply fail to shut
off, do not disconnect the electrical supply to the pump.
Instead, shut off the gas supply at a location external to
the appliance.
CAUTION

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
For your Safety (continued)
Safety
Ensure ambient temperatures are higher than 32°F
(0°C) and lower than 104°F (40°C).
Prevent the air from becoming contaminated by
halogenated hydrocarbons (e.g. as contained in
paint solvents or cleaning fluids) and excessive dust
(e.g. through grinding or polishing work). Combustion
air for the heating process, and ventilation of the
boiler room must be free of corrosive contaminants.
To that end, any boiler must be installed in an area
that has no chemical exposure. The list on page 7
indicates the main, currently known sources.
Avoid continuously high levels of humidity
(e.g. through frequent drying of laundry).
Never close existing ventilation openings.
Frozen water pipe hazard
Your heating boiler is designed to provide a warm and
comfortable living environment. It is NOT designed to
ensure against freezing of water pipes.
The boiler is equipped with several safety devices that are
designed to shut down the boiler and to prevent it from
restarting in the event of various unsafe conditions.
If your boiler remains off for an extended period of time
during cold weather, water pipes may freeze and burst,
resulting in extensive water damage and conditions in
which mold could grow. Certain molds are known to
cause respiratory problems, as well as to pose other
serious health risks. In case of water damage, immediate
measures should be taken to dry out affected areas as
quickly as possible to prevent mold from developing.
If your home will be unattended for an extended period
of time during cold weather, you should...
- Shut off the water supply to the building, drain the
water pipes and add an antifreeze for potable water
to drain traps and toilet tanks. Open faucets where
appropriate.
Or...
- Have someone check the building frequently during
cold weather and call a qualified service agency if
required.
Or...
- Install a reliable remote temperature sensor that will
notify somebody of freezing conditions within the
home.
Replacement components, spare and wear parts
Components which are not tested with the heating
system may damage the heating system, or affect its
functions. Installation or replacement may only be carried
out by a qualified heating contractor.
IMPORTANT
WARNING
Failure to protect against frozen pipes could result in
burst water pipes, serious property damage and/or
personal injury. Boiler may shut down. Do not leave
your home unattended for long periods of time during
freezing weather conditions without turning off the
water supply and draining water pipes or otherwise
protecting against the risk of frozen pipes. WARNING
Fire causes a risk of burns and explosion!

Shut down the boiler

Close fuel shut-off valves

Use a tested fire extinguisher,
class ABC.
WARNING
If you notice fire coming from the appliance, call
the fire department immediately! Do not attempt to
extinguish the fire unless qualified to do so.

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5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
For your Safety (continued)
Sources of combustion and ventilation air contaminants.
Areas likely to contain contaminants:
- New building construction
- Swimming pools
- Remodelling areas, hobby rooms
- Garages with workshops
- Furniture refinishing areas
- Dry cleaning/laundry areas and establishments
- Auto body shops
- Refrigeration repair shops
- Metal fabrication plants
- Plastic manufacturing plants
- Photo processing plants
- Beauty salons
Products containing contaminants:
- Chlorine-type bleaches, detergents and cleaning
solvents found in household laundry rooms
- Paint and varnish removers
- Hydrochloric acid, muriatic acid
- Chlorine-based swimming pool chemicals
- Spray cans containing chlorofluorocarbons
- Chlorinated waxes and cleaners
- Cements and glues
- Refrigerant leaks
- Calcium chloride used for thawing
- Sodium chloride used for water softening salt
- Permanent wave solutions
- Adhesives used to fasten building products and other
similar items
- Antistatic fabric softeners used in clothes dryers
Safety
WARNING
Incorrect ambient conditions can lead to damage to
the heating system and put safe operation at risk.
Installation area conditions Energy saving tips (central heating)
Room temperature:
Never overheat your rooms. Every 2°F (1°C) of room
temperature reduction saves up to 6% on your
heating bills.
Never set your room temperature higher than 68°F
(20°C).
Operating modes:
If you do not require central heating, select one of
the following operating modes:
– In summer, if you do not want to heat any rooms
but do need DHW, set the boiler water temperature
to OFF (see page 10).
– If you require neither room heating nor DHW for an
extended period, set the boiler water temperature
and the DHW temperature to OFF.
Ventilation:
To ventilate, open windows fully briefly, and meanwhile
close the thermostatic valves (if there is no mechanical
ventilation system installed).
Roller shutters:
Close roller shutters (where installed) at dusk.
Thermostatic valves:
Ensure that thermostatic valves are properly adjusted.
Radiators:
Never cover radiators or thermostatic valves.
DHW temperature:
Never set the DHW tank temperature excessively
high (see page 14).
Hot water consumption:
Consider showering instead of running a bath.
A shower generally uses less energy than a full bath.
Lead free:
This product conforms to NSF/ANSI 372 for “lead
free” plumbing products as defined by applicable
US state laws and by section 1417 of the US Safe
Drinking Water Act.

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5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
Overview of Controls and Indicators
Start-up
Legend
ADisplay value or “ F” (fault)
BTemperature in °F/°C (in conjunction with
the display value)
CHeating mode
DDHW heating
EDisplay value or fault code
FFault indicator
GBurner fault reset
HTemperature in °F/°C (in conjunction with
the display value)
IOn-screen buttons
JCommissioning setting active (contractors only)
KDHW comfort function active (only for B1KA)
LCurrent burner output (each bar = 20% *)
MDHW comfort function not active (only for B1KA)
NService setting active (contractors only)
OBurner in operation
Display indicators and operating buttons
The control unit is equipped with a touchscreen.
To make changes to settings and call up information,
tap the on-screen buttons.
Activation of the on-screen buttons is confirmed with a
signal tone. Your heating contractor can turn the signal
tone off, if desired.
On-screen buttons for operation
MODE Selecting/terminating functions
YChanging or selecting values
BChanging or selecting values
OK Accepting values/confirming selection
1 step back
R Burner fault reset
Default display
The following is displayed:
Current boiler water temperature
Operating mode
Burner operation and current burner output
* Above diagram shows range of 40%

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5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating Operation
Operating Mode of the Heating System
Legend
APressure gage
BLCD display unit
Cpower switch ON/OFF
Operation without room temperature thermostat
Setting the required heating water temperature, see
page 10.
Operation with room temperature thermostat
Make any settings on the connected room temperature
controller using the relevant operating instructions.
Note: Set the boiler water temperature high enough to
achieve the required room temperature.
For boiler water temperature setting, see page 11
Weather-compensated operation without room
temperature thermostat
In weather-compensated mode, the boiler water
temperature is regulated subject to the outside
temperature.
For setting the room temperature, see page 11.
Weather-compensated operation with room temperature
thermostat
In weather-compensated mode, the boiler water
temperature is regulated subject to the outside
temperature.
Note: Connect a room thermostat to your heating system
to prevent heat being generated unnecessarily at
times when you do not require central heating.
This enables central heating to be suspended at
night, for example, in order to save energy.
For setting the room temperature, see page 11.
Starting the Heating System
1. Check the pressure of your heating system on the
pressure gauge.
Minimum system pressure 12 psi (0.8 bar)
Notify your heating contractor if the system pressure
is too low.
2. In room air dependent operation:
Combustion air is drawn from the boiler room.
Check whether the vents in the boiler room are open
and unobstructed.
- Open the gas shut-off valve.
- Turn ON the ON/OFF switch.
Your heating system and room temperature thermostat
(if connected) are now ready for operation.

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5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
Shutting Down the Heating System
Operation
Without frost protection (shutdown)
Shut down your heating system completely if it will not
be needed for longer periods (several months).
We recommend you contact your local heating contractor
if you are planning to take your heating system out of use
for long periods. Your heating contractor can then take
suitable steps such as frost protection for the system or
heating surface preservation as required.
1. Close the gas shut-off valve and safeguard against
unauthorized reopening.
2. Turn OFF the ON/OFF switch.
Note: The system is no longer protected against frost.
Stopping Central Heating and DHW Heating
Stopping DHW heating
You do not want to have DHW available.
Tap the following on-screen buttons:
1. MODE
2. /until flashes.
3. OK to confirm.
The set DHW temperature flashes.
4. B until “OFF” is displayed.
5. OK to confirm.
For additional information see page 12.
With frost protection monitoring
If you do not wish to use your boiler for several days you
can stop central heating and/or DHW production. Set the
boiler water temperature and the DHW temperature to
OFF.
Frost protection monitoring is now active for the boiler
and the DHW tank, see below for detailed instructions.
Note: Frost protection for the entire heating system
– see operating instructions for the room
temperature controller.
Stopping central heating
You do not want to heat your home but you want to
have DHW available (summer mode).
Tap the following on-screen buttons:
1. Bthe set boiler water temperature flashes and
is rdisplayed.
2. Buntil “OFF” is displayed.
3. OK to confirm.
Note: The boiler circulation pump briefly starts every
24 hours to prevent it from seizing up.
Boiler frost protection is enabled.
Setting the Central Heating Temperature
Operation without room temperature thermostat
If no outside temperature sensor and no room temperature
controller is connected, jumper must be installed on OT
terminals.
The room temperature is influenced by the heating
water temperature. In the delivered condition, the heating
water temperature is set to 158°F (70°C).
Setting the heating water temperature
Tap the following on-screen buttons:
1. /the set heating water temperature flashes and r
is displayed.
2. /until the required heating water temperature is
displayed.
3. OK to confirm.
Refer to the Installation and Service
Instructions.
Display shows current boiler water temperature

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5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating Operation
Setting the Central Heating Temperature (continued)
Operation with room temperature thermostat
If no outside temperature sensor is connected,
but a room temperature controller is.
If the required room temperature is not achieved,
ensure the boiler water temperature setting is sufficiently
high. In the delivered condition, the boiler water
temperature is set to 158°F (70°C).
Setting the boiler water temperature
Weather-compensated operation without room temperature
thermostat
Setting the room temperature
An outside temperature sensor must be connected for
weather-compensated operation and a jumper must be
installed on OT terminals.
In the delivered condition, a parameter value of 20 (or
68 if display converted to °F) is set for central heating.
Should you wish to set a higher room temperature,
increase the parameter value;
reduce it for a lower room temperature.
Refer to ‘setting the heating curve’ on pages 12 and 13.
Weather-compensated operation with room temperature
thermostat
Setting the room temperature
In the delivered condition, a parameter value of 20 (or
68 if display converted to °F) is set for central heating.
Should you wish to set a higher room temperature,
increase the parameter value;
reduce it for a lower room temperature.
Refer to ‘setting the heating curve’ on pages 12 and 13.
Call for heat on the room thermostat will activate the
boiler. The boiler will operate based on the selected
outdoor reset curve. When room thermostat is satisfied
the boiler will shut down until the next call by the room
thermostat.
Left side of the display shows current boiler water temperature.
Right side displays current outdoor temperature.
Tap the following on-screen buttons:
1. /the set boiler water temperature flashes and r
is displayed.
2. /until the required boiler water temperature is displayed.
3. OK to confirm.
Display shows current boiler water temperature
Refer to the Installation and Service
Instructions.
Left side of the display shows current boiler water temperature.
Right side displays current outdoor temperature.

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
Operation
Setting the Heating Curve
Frost protection function
The frost protection function requires an outside
temperature sensor to be connected. The frost protection
function becomes active at outside temperatures of
<41°F (<5°C). The burner starts and the boiler water
temperature is held at 68°F (20°C).
1. Tap MODE.
2. Tap /until CONFI flashes.
3. Tap OK to confirm.
“P” is displayed in left hand display area. The right
hand display area flashes. Enter 12 with /.
4. OK to confirm.
“1” flashes in left hand display area.
5. Use /to select “15”.
6. OK to confirm.
The right hand display flashes
Here, the heating curve slope can be adjusted.
02 represents the heating curve 0.2, adjustable to 35
(heating curve slope 3.5).
7. Tap /to select heating curve slope.
8. OK to confirm.
The selected value is adopted.
Heating curve
Heating curves illustrate the relationship between the out-
door temperature, the set room temperature and the boiler
water temperature or supply temperature.
The lower the outdoor temperature, the higher the boiler
water temperature or supply temperature.
In order to guarantee sufficient heat and minimum fuel
consumption at any outdoor temperature, the conditions
of your building and your heating system must be taken
into consideration. The heating curve is set by your heat-
ing contractor for this purpose.
Slope
Boiler water
Set point
Outside temperature
Adjusting the Heating Curve
Legend
AChanging the slope:
The gradient of the heating curves changes.
Outdoor temperature
Boiler water or supply temperature
Factory settings
Slope = 1.4 and set point
Example:
For outdoor temperature −14°C:
AUnderfloor heating system, slope 0.2 to 0.8
BLow temperature heating system, slope 0.8 to 1.6
CHeating system with a boiler water temperature in
excess of 75°C, slope 1.6 to 2.0

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
Parameter default setting is 20 (or 68 if display is
converted to °F).
Heating curve set point
Setting the set point
1. Tap /.
The set parameter flashes and r will be displayed.
2. Use /to select the parameter.
3. OK to confirm.
Note: When adjusting this setting, bear in mind that
your heating system requires some time to heat
the home to the required temperature.
Adjusting the Heating Curve Set Point
Legend
ABoiler water temperature
BOutdoor temperature
CSet point
Increasing set point temperature
Reduced set point temperature
Adjustment of the increase set point temperature
from 68 to 79°F (20 to 26°C)
Adjustment of the reduced set point temperature
from 37 to 52°F (3 to 14°C)
Legend
ABoiler water temperature
BOutdoor temperature
CSet point
Operation

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
For the Vitodens 100-W B1KA with instantaneous DHW
a scalding label is placed on the side of the boiler.
Tap the following on-screen buttons:
1. MODE
2. /until flashes.
3. OK to confirm.
The set DHW temperature flashes.
4. /to set the required DHW temperature.
5. OK to confirm.
DHW comfort function
Only for Vitodens 100-W B1KA boiler.
Your heating contractor can activate the DHW comfort
function. This makes DHW available faster when
required. The display then shows “COMFORT”.
Operation
DHW Temperature

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5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating Troubleshooting
Rooms are too Cold
Cause Remedy
The heating system is off. - Turn on the ON/OFF switch 8(see illustration on page 9).
- Switch ON the mains power switch, if installed (outside
the boiler room).
- Reset the circuit breaker in the power distribution
board.
Control unit or remote control incorrectly adjusted. - Operation with room temperature controller:
Set a higher boiler water temperature (see page 11).
- Weather-compensated operation:
Set a higher room temperature (see page 11).
Only when operating with DHW heating:
DHW priority is enabled ( is displayed)
Wait until the DHW tank has been heated up.
In the case of operation with instantaneous domestic hot
water B1KA), stop DHW draw-off.
No fuel. With liquid propane gas:
Check the fuel reserves and re-order if required.
With natural gas:
Open the gas shut-off valve. If necessary, check with
your gas supply utility.
 is shown on the display Notify your heating contractor of the fault code shown.
 and the fault code flash on the display. The burner
does not start.
Reset burner fault (see page 17).
Notify your heating contractor if the fault recurs.
Danger: If faults are not rectified, they can have life
threatening consequences.
Do not reset the burner fault several times in
quick succession. Notify your heating contractor
if a fault recurs. Your heating contractor will be
able to analyze the cause and rectify the fault.
Air in the heating system Bleed radiators.
The burner is switched off. Blockage in the ventilation
air supply or flue system.
Notify your local heating contractor.
Cause Remedy
Control unit or remote control is incorrectly adjusted. Check and correct the room temperature or boiler water
temperature (see page 11)
Refer to room temperature controller operating instructions
 is shown on the display Inform your heating contractor of the fault code.
Rooms are too Hot

16
5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
Troubleshooting
Cause Remedy
The heating system is off. - Turn on the ON/OFF switch 8(see diagram on page 8).
- Switch ON the mains power switch, if installed
(outside the boiler room).
- Reset the circuit breaker in the power distribution.
Control unit or remote control incorrectly adjusted. Check settings and correct if required:
- DHW heating must be enabled (see page 14).
No fuel. With LPG:
Check the fuel reserves and re-order if required.
For natural gas:
Open the gas shut-off valve. If necessary, check with
your gas supply utility.
 is shown on the display Notify your heating contractor of the fault code shown.
 and the fault code flash on the display. The burner
does not start.
Reset burner fault (see page 17).
Notify your heating contractor if the fault recurs.
Danger: If faults are not rectified, they can have life
threatening consequences.
Do not reset the burner fault several times in
quick succession. Notify your heating contractor
if a fault recurs. Your heating contractor will be
able to analyze the cause and rectify the fault.
There is no Hot Water
The DHW is too Hot
Cause Remedy
The control unit is incorrectly adjusted. Check and correct the DHW temperature if required
(see page 14).
 and Fault Code Flashes on the Display
Cause Remedy
The burner does not start. Reset burner fault (see page 17).
Notify your heating contractor if the fault recurs.
Danger: If faults are not rectified, they can have life
threatening consequences.
Do not reset the burner fault several times in
quick succession. Notify your heating contractor
if a fault recurs. Your heating contractor will be
able to analyze the cause and rectify the fault.
 is Shown on the Display
Cause Remedy
Heating system fault. Inform your heating contractor of the fault code.

17
5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
Service Instructions for Your Heating System
Troubleshooting
Fault Messages on the Display
Any faults in your heating system are indicated on the
display by a flashing fault symbol ”
 ”.
Read off the fault code in the display and report it to your
heating contractor. This helps the contractor to properly
prepare, and may result in lower service costs.
WARNING
Visually inspect the vent termination for any signs of
blockage. Under cold climate conditions [sustained
temperatures below 0° F (-18° C)] the vent termination
may be severely blocked by icicle and frost build-up.
The boiler control will automatically shut down the
boiler should air intake or vent be blocked. Remove
blockage if possible. Reset the boiler switch (ON / OFF
switch to OFF and then back to ON) (see page 10) and
the boiler should attempt to restart. If blockage is not
obvious and cannot be removed, contact a licensed
professional heating contractor.
Resetting a Burner Fault
Note: If  flashes and “R” appears on the display, the
burner is locked out.
Press and hold “R” for approx. 2 seconds. If the fault no
longer exists, the default display will appear.
Notify your heating contractor if the fault recurs.
WARNING
If faults are not rectified, they can have life
threatening consequences.
Do not reset the burner fault several times in quick
succession. Notify your heating contractor if a fault
recurs. Your heating contractor will be able to analyze
the cause and rectify the fault.

18
5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
Maintenance
Cleaning
All appliances may be cleaned with a commercially
available domestic cleaning agent (non-scouring).
Inspection and Maintenance
Regular maintenance ensures trouble-free, energy efficient
and environmentally responsible heating operation.
For this, we strongly advise you to arrange an
inspection and maintenance contract with your heating
contractor.
Boiler
Increasing boiler contamination raises the flue gas
temperature and thereby increases energy losses.
All boilers should therefore be cleaned annually.
Refer to the Installation and Service
Instructions.

19
5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
Service Instructions for Your Heating System
Information
Terminology
Temperature and pressure relief valve
Safety equipment that must be installed in the hot water
tank by your heating contractor. The safety valve opens
automatically to prevent excess pressure in the DHW tank.
Drinking water filter (if installed)
A device that removes solids from potable water.
The drinking water filter is installed in the cold water
pipe upstream of the DHW tank or the instantaneous
water heater.
For reasons of good hygiene:
replace filter element on non-backwashing filters
every 6 months (visual inspection every 2 months),
on backwashing filters, backwash every 2 months.
Supply temperature
The temperature of the heating water that flows to the
radiators (in the supply line). Accordingly, the temperature
of the heating water that flows from the radiators to
the boiler (in the return line) is referred to as return
temperature.
Weather-compensated operation
In weather-compensated mode, the flow temperature
is controlled according to the outside temperature. This
means that no unnecessary heat is generated in order
to heat the rooms to the required room temperature
you selected.
The outside temperature is captured and transmitted to
the control unit by a sensor fitted outside the building.
Constant temperature operation
In constant temperature operation, the heating water is
constantly (continuously) heated to the selected boiler
water temperature.
Supply water temperature
The temperature of the heating water that flows to the
radiators (roughly equal to boiler water temperature).
Boiler water temperature
The heating water in the boiler (boiler water) is heated
to the temperature set at the control unit. This
temperature is referred to as boiler water temperature.
Room air dependent operation
The combustion air is drawn from the room where the
boiler is installed.
Direct vent operation
The combustion air is drawn from outside the building.
The flue gases are vented outside the building.
Room temperature-dependent operation
A room temperature thermostat captures the room
temperature and compares this with the required room
temperature you set. If the room temperature is lower
than the required value, the boiler is switched on; if the
room temperature is higher than the required value,
the boiler is switched off.
Make any settings on the connected room temperature
controller using the relevant operating instructions.
Note: The heating water temperature must be set high
enough in order to achieve the required room
temperature.

5784 570 - 06
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Operating
Start-up and Maintenance
Start-up and Maintenance
FOR YOUR SAFETY READ BEFORE OPERATING
W A R N I N G: If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal injury or loss of life.
A. This appliance does not have a pilot. It is equipped
with an ignition device which automatically lights
the burner. Do not try to light the burner by hand.
B. BEFORE OPERATING smell all around the appliance
area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will
settle on the floor.
WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance.
•Do not touch any electric switch; do not use any
phone in your building.
•Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
•If you cannot reach your gas supplier, call the
fire department.
C. Use only your hand to push in or turn the gas
control knob. Never use tools. If the knob will
not push in or turn by hand, don’t try to
repair it, call a qualified service technician.
Force or attempted repair may result in a fire
or explosion.
D. Do not use this appliance if any part has been
under water. Immediately call a qualified
service technician to inspect the appliance
and to replace any part of the control system
and any gas control which has been under
water.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above on
this label.
2. Set thermostat or other operating control to
lowest setting.
3. Turn off all electric power to the appliance.
4. This appliance is equipped with an ignition
device which automatically lights the burner.
Do not try to light the burner by hand.
5. Close main gas shut-off valve.
6. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor.
If you smell gas, STOP! Follow “B” in the
safety information above on this label. If you
don’t smell gas, go to the next step.
7. Open main gas shut-off valve.
8. Turn on all electric power to the appliance.
9. Set thermostat or other operating control to
desired setting.
10.If the appliance will not operate, follow the
instructions “To Turn Off Gas To Appliance”
and call your service technician or gas
supplier.
Manual gas shutoff
Closed
Open
TO TURN OFF GAS TO APPLIANCE
1. Set thermostat or other operating control to lowest setting.
2. Turn off all electric power to the appliance if service is to be performed.
3. Close main gas shut-off valve.
Lighting and Operating Instructions
Information
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