Viessmann B1KA - Rooms Are too Cold; Rooms Are too Hot

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5784 570 - 02
Vitodens 100-W, B1HA series & B1KA Combi Operating
Troubleshooting
Rooms are too Cold
Cause Remedy
The heating system is off.
- Turn on the ON/OFF switch
8 (see diagram 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 16).
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