70
Troubleshooting
6 720 617 763 (2008/09)
9.2 Troubleshooting without using the display
Fault
Cause
Remedy
Required room temperature
not achieved.
Thermostatic valve(s) set too low.
Set thermostatic valve(s) higher.
Minimum outside temperature setting too
low.
Ask your installer to adjust minimum out-
side temperature setting (
Æ
page 59)
Heating curve set too low.
“Heating levels” for “Comfort” or ask your
installer to correct heating curve.
Flow temperature controller on the boiler
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 sys-
tem.
Room temperature offsetset incorrectly
Perform adjustment to room temperature
sensor (
Æ
page 59) and correct Room
temperature offset (
Æ
page 58)
The boilers holiday function is active.
Deactivate the boilers holiday function.
Heating up takes too long.
“Heating up speed” set too low.
Set “Heating up speed” e. g. to “Fast”.
Flow temperature from
boiler too low, radiators too
cool.
Minimum outside temperature setting too
low.
Ask your installer to adjust minimum out-
side temperature setting (
Æ
page 59)
Required room temperature
greatly exceeded.
Radiators become too hot.
Set thermostatic valve(s) lower.
“Heating levels” for “Comfort” or ask your
installer to correct heating curve.
FW 100 installed in an unfavourable loca-
tion, e.g. external wall, near windows, in a
draught,
Select a better location for FW 100 and
ask your heating engineer to reposition it.
Room temperature offsetset incorrectly
Perform adjustment to room temperature
sensor (
Æ
page 59) and correct Room
temperature offset (
Æ
page 58)
Excessive room tempera-
ture fluctuations.
Temporary influence of external heat on
the room, e.g. through solar radiation,
lighting, TV, fireplace etc.
Ask your installer to increase “Room influ-
ence”.
Select a better location for FW 100 and
ask your heating engineer to reposition it.
Temperature rises instead of
falling.
Clock 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 “Econ-
omy” and/or “Frost”.
Incorrect or no control.
BUS connection or BUS subscriber faulty. Ask your installer to check the BUS con-
nection against the wiring diagram and
correct it if required.
Controller can only be set to
automatic mode.
Mode selector faulty.
Have FW 100 replaced by your installer.
Tab. 24
