Operating instructions

14
5600 333 v1.1
Vitodens 100-W, WB1B Operating & User’s Information
Operation
Fault Diagnosis and Correction
Issue Cause Corrective Action
Heating system does not start up Heating system switch turned to
OFF on control unit
Turn switch to ON on control unit.
Selector dial “tr” is set to “0”.
Set required heating water temperature
(see page 10).
Circuit breaker or fuse in power
supply or in boiler control unit has
blown or tripped
Inform heating contractor.
Burner does not switch on or
only intermittently
No gas Open gas shut-off valve or contact your
gas supply company.
Fault on control unit Make a note of the fault code and inform
heating contractor.
Burner does not start up; burner
fault, “U” is displayed on control
unit
Faulty start-up Press ON / OFF switch to OFF position and
then back ON. This will reset the boiler
fault (see page 10). Should this attempt
fail, contact your heating contractor.
Fault on control unit
Burner does not start up, no fault
“U“ display. “r” and / or ”w“
on the display
No water flow Flow switch defective or boiler pump
failure. Inform heating contractor.
Burner does not start up; burner
fault “U” appears in display
Power supply too low Contact your Hydro company.
The burner switches off even
though the desired room
temperature has not been
reached
Fault in combustion air supply or in
the venting system
Contact your heating contractor.
Heating water temperature or room
temperature is set too low
Increase heating water temperature by
turning selector dial “tr” or by increasing
desired room temperature on the room
thermostat.
Air in heating system
Rooms are cold although burner
is operating
Domestic hot water supply has
priority (operation with DHW storage
tank only)
Wait until the domestic hot water heating
is complete.
Fault on programmable room
thermostat
Contact your heating contractor.
Circulation pump fault
Rooms are not at the required
temperature, even though the
temperature is operating
DHW priority
Circulation pump faulty
DHW temperature is too low DHW temperature is set too low or
rotary selector “
“ is set to “0”
(only with the CombiPLUS kit)
Fault code “58” appears on the
display
Jumper connection shorted out,
removed or missing
Contact your heating contractor.