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9.2
Troubleshooting without using display
Problem
Required room temperature
not achieved.
Required room temperature
greatly exceeded.
Excessive room temperature
fluctuations.
Temperature rises instead of
falling.
Room temperature too high
during "Economy" and/or
"Frost" mode.
Incorrect or nocontrol.
Controller can only be set to
automatic mode.
DHW cylinder does not heat
up.
Heating on during the night. Heat-up optimisation starts the heating
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).
Cause
Thermostatic valve(s) set too low.
Flow temperature controller on heating
appliance set too low.
Air in the heating system.
Radiators become too hot.
Installation location of FR 120
unfavourable, e.g. external wall, close to
window, in a draught etc.
Temporary influence of external heat on
the room, e.g. through solar radiation,
lighting, TV, fireplace etc.
Time incorrectly set.
The building retains a lot of heat.
BUS connection of BUS subscribers
faulty.
Operating mode selector faulty.
DHW temperature control on heating
appliance set too low.
Flow temperature controller on heating
appliance set too low.
DHW program incorrect
Incorrect System configuration for DHW
system.
early so that the home reaches the required
room temperature by the set time.
Remedy
Set thermostatic valve(s) higher.
Set the flow temperature controller
higher.
Reduce influence of solar optimisation if
necessary.
Bleed radiators and vent the heating
system.
Set thermostatic valve(s) lower.
Set "Heating levels" for "Comfort" lower.
Select a better installation location for
FR 120 and ask your contractor to
reposition it.
Select a better installation location for
FR 120 and ask your contractor to
reposition it.
Check time setting.
Set an earlier switching time for
"Economy" and/or "Frost".
Ask your heating contractor to check the
BUS connection against the connection
diagram and correct if required.
Have FR 120 replaced by your contractor.
Set DHW temperature controller higher.
Reduce influence of solar optimisation if
necessary.
Turn flow temperature controller on heating
appliance clockwise as far as it will go.
Check/correct program.
Correct the configuration to match the
DHW system connected.
Set a later time for the required room
temperature.
Switch off heat-up optimisation.
Appliance details
Type:
..........................................................................
Part number:
..........................................................................
Date of manufacture (FD...):
..........................................................................
Troubleshooting | 57
6 720 800 817 (2012/02)
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Table of Contents
Troubleshooting
