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

TROUBLESHOOTING - FW 100
8.2

TROUBLESHOOTING WITHOUT THE DISPLAY

Fault Cause
Required room Thermostatic valve(s) set too low.
temperature not
Minimum outside temperature setting too
achieved.
low.
Heating curve set too low.
Flow temperature controller on the boiler
set too low.
Air in the heating system.
Room temperature offset set incorrectly
The boilers holiday function is active.
Heating up takes too "Heating up speed" set too low.
long.
Flow temperature Minimum outside temperature setting too
from boiler too low, low.
radiators too cool.
Required room Radiators become too hot.
temperature greatly
exceeded.
FW 100 installed in an unfavourable
location, e.g. external wall, near windows,
in a draught,
Room temperature offset set incorrectly
Excessive room Temporary influence of external heat on the
temperature room, e.g. through solar radiation, lighting,
fluctuations. 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.
Domestic hot water Domestic hot water temperature control on
cylinder does not boiler set too low.
heat up.
Flow temperature controller on the boiler
set too low.
Domestic hot water programme fault.
Incorrect System configuration for
domestic hot water system.
Tab. 31
62
Supplied By www.heating spares.co Tel. 0161 620 6677
Remedy
Set thermostatic valve(s) higher.
Adjust minimum outside temperature setting.
"Heating levels" for "Comfort" - Correct heating
curve.
Set the flow temperature controller higher.
Reduce influence of solar optimisation if
necessary.
Bleed radiators and vent the heating system.
Perform adjustment to room temperature sensor
and correct Room temperature offset.
Deactivate the boilers holiday function.
Set "Heating up speed" e. g. to "Fast".
Adjust minimum outside temperature setting.
Set thermostatic valve(s) lower.
"Heating levels" for "Comfort" or ask your
installer to correct heating curve.
Select a better location for FW 100 and ask your
heating engineer to reposition it.
Perform adjustment to room temperature sensor
and correct Room temperature offset.
Increase "Room influence".
Select a better location for FW 100.
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 FW 100 replaced by your installer.
Set domestic 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 domestic
hot water system connected.
8 716 115 748 (2009/09)