Operation Manual

6 720 645 349 (2010/09)
64 | Troubleshooting
9.2 Troubleshooting without display
Problem Cause Remedy
Required room temperature
not achieved.
Thermostatic valve(s) set too low. Set thermostatic valve(s) higher.
Heating curve set too low. Set "Heating levels" for "Comfort" higher
or arrange for your contractor to correct
the heating curve.
Flow temperature controller on heating
appliance set too low.
Set flow temperature controller higher.
Reduce influence of solar optimisation if
necessary.
Air lock in heating system. Bleed radiators and vent heating system.
Heating lasts too long. "Heating up speed" set too low. Set "Heating up speed", for example, to
"Fast".
Required room temperature
greatly exceeded.
Radiators become too hot. Set thermostatic valve(s) lower.
Set "Heating levels" for "Comfort" lower
or arrange for your contractor to correct
the heating curve.
Installation location of FW 100
unfavourable, e.g. external wall, close to
window, in a draught, ...
Select a better installation location for
FW 100 and ask your heating 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.
Arrange for your contractor to increase
"Room influence".
Select a better installation location for
FW 100 and ask your heating 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.
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 wiring
diagram and correct it if required.
Controller can only be set to
automatic mode.
Operating mode selector faulty. Have FW 100 replaced by your contractor.
DHW cylinder does not heat
up.
DHW temperature controller 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 fully clockwise.