Troubleshooting Without The Display - Worcester CDi Combi N.G Service Booklet

9.2

TROUBLESHOOTING WITHOUT THE DISPLAY

Fault Cause
Required room Thermostatic valve(s) set too low.
Flow temperature controller on the boiler set
temperature not
too low.
achieved.
Air in the heating system.
Holiday key on the boiler enabled.
Required room Radiators become too hot.
temperature greatly
FR 110 installed in an unfavourable location,
exceeded.
e.g. external wall, near windows, in a
draught,
Excessive room Temporary influence of external heat on the
temperature room, e.g. through radiant energy from the
fluctuations. sun, lighting, TV, fireplace etc.
Temperature rises Clock time incorrectly set.
instead of falling.
Room temperature The building retains a lot of heat.
too high during
"Economy" and/or
"Frost" mode.
Incorrect or no BUS connection or BUS subscriber faulty.
control.
Controller can only Mode selector faulty.
be set to automatic
mode.
Hot water cylinder Hot water temperature control on boiler set
does not heat up. too low.
Flow temperature controller on the boiler set
too low.
Hot water programme fault.
Incorrect System configuration for hot water
system.
Heating on during Heat-up optimisation starts the heating early
the night. so that the home reaches the desired room
temperature by the set time.
Tab. 33
8 716 115 748 (2009/09)
Supplied By www.heating spares.co Tel. 0161 620 6677
TROUBLESHOOTING - FR110
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.
Disable the holiday key on the boiler.
Set thermostatic valve(s) lower.
Set Heating levels for "Comfort" lower.
Select a better location for FR 110 and
reposition it.
Select a better location for FR 110 and
reposition it.
Check time setting.
Set an earlier switching time for "Economy"
and/or "Frost".
Check the BUS connection against the wiring
diagram and correct it if required.
Have FR 110 replaced by your heating engineer.
Set hot water temperature control higher.
Reduce influence of solar optimisation if
necessary.
Turn the flow temperature control on the boiler
clockwise as far as it will go.
Check/correct programme.
Correct the configuration to match the hot
water system connected.
Set a later time for the desired room
temperature.
Switch off heat-up optimisation.
67