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Troubleshooting | 57
9.2 Troubleshooting without using display
If the fault persists:
B Call an authorised contractor or the customer
service department and inform them of the
fault, quoting the appliance details (from type
plate inside flap).
Appliance details
Type:
..........................................................................
Part number:
..........................................................................
Date of manufacture (FD...):
..........................................................................
Problem Cause Remedy
Required room temperature
not achieved.
Thermostatic valve(s) set too low. Set thermostatic valve(s) higher.
Flow temperature controller on heating
appliance set too low.
Set the flow temperature controller
higher.
Reduce influence of solar optimisation if
necessary.
Air in the heating system. Bleed radiators and vent the heating
system.
Required room temperature
greatly exceeded.
Radiators become too hot. Set thermostatic valve(s) lower.
Set “Heating levels” for “Comfort” lower.
Installation location of FR 120
unfavourable, e.g. external wall, close to
window, in a draught etc.
Select a better installation location for
FR 120 and ask your contractor to
reposition it.
Excessive room temperature
fluctuations.
Temporary influence of external heat on
the room, e.g. through solar radiation,
lighting, TV, fireplace etc.
Select a better installation location for
FR 120 and ask your contractor to
reposition it.
Temperature rises instead of
falling.
Time incorrectly set. Check time setting.
Room temperature too high
during “Economy” and/or
“Frost” mode.
The building retains a lot of heat. Set an earlier switching time for
“Economy” and/or “Frost”.
Incorrect or nocontrol. BUS connection of BUS subscribers
faulty.
Ask your heating contractor to check the
BUS connection against the connection
diagram and correct if required.
Controller can only be set to
automatic mode.
Operating mode selector faulty. Have FR 120 replaced by your contractor.
DHW cylinder does not heat
up.
DHW temperature control on heating
appliance set too low.
Set DHW temperature controller higher.
Reduce influence of solar optimisation if
necessary.
Flow temperature controller on heating
appliance set too low.
Turn flow temperature controller on heating
appliance clockwise as far as it will go.
DHW program incorrect Check/correct program.
Incorrect System configuration for DHW
system.
Correct the configuration to match the
DHW system connected.
Heating on during the night. Heat-up optimisation starts the heating
early so that the home reaches the required
room temperature by the set time.
Set a later time for the required room
temperature.
Switch off heat-up optimisation.
57


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