6 720 643 259 (2010/05)
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Troubleshooting
US/CA
9.2 Troubleshooting without using display
Problem
Cause
Remedy
Required room temperature
not achieved.
Thermostat(s) set too low.
Set thermostat(s) higher.
Heating curve set too low.
Set “Heating levels” higher for “Comfort”
or arrange for installer to correct heating
curve.
Supply temperature controller on the
boiler set too low.
Set the supply temperature controller
higher.
Reduce influence of solar optimization if
necessary.
Air in the heating system.
Bleed radiators and vent the heating
system.
Heat-up takes too long
“Heat-up speed” set too low.
Set “Heat-up speed” e.g. to “Fast”.
Required room temperature
greatly exceeded.
Radiators become too hot.
Set thermostatic valve(s) lower.
Set “Heating levels” lower for “Comfort”
or arrange for installer to correct heating
curve.
Installation site of FB 100 unfavorable,
e.g. external wall, close to window, in a
draft, ...
Select a better location for FB 100 and
ask your installer 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 installer to increase “Room
influence”.
Select a better location for FB 100 and
ask your installer to reposition it.
Mixer time set incorrectly.
Have mixer time set by the installer
according to the technical data for the
mixer.
Temperature rises instead of
falling.
Incorrect time and date set, e.g. after a
longer power failure.
Check setting on the controls.
Room temperature too high
during “Economy” and/or
“Frost” mode.
The building retains a lot of heat.
Set an earlier switch point for “Economy”
and/or “Frost”.
Incorrect or no control.
BUS connection or BUS device defective. Ask your installer actor to check the BUS
connection against the wiring diagram
and correct it if required.
Controller can only be set to
automatic mode.
Mode selector defective.
Have FB 100 replaced by your installer.
Domestic hot water tank
does not heat up.
Hot water temperature control on boiler
set too low.
Set hot water temperature control higher.
Reduce influence of solar optimization on
the controls if necessary.
Supply temperature controller on the
boiler set too low.
Turn the supply temperature control on
the boiler clockwise as far as it will go.
