Worcester CDi Combi N.G Service Booklet page 37

CC
and fault indicator LED are flashing.
Outside temperature sensor fault (open or short circuit)
Check
1. B Power OFF the appliance.
B Disconnect the boiler mains
connection.
Are the outside temperature sen-
sors connected to A and F on the
printed circuit board.
2. B Power off the appliance.
At the outside temperature sensor
cable connection, measure the
resistance of the outside
temperature sensor.
Does the value match that in table
44?
3. B Power OFF the appliance.
B Disconnect the boiler mains
connection.
B Disconnect the outside
temperature sensors at connec-
tors A and F on the PCB.
Check for continuity, is there
continuity.
4. The PCB control board is damaged.
Tab. 20 CC Error codes
8 716 115 748 (2009/09)
Supplied By www.heating spares.co Tel. 0161 620 6677
Action
yes go to 2
no B Connect the outside temperature sensors correctly
to A and F on the PCB.
B Reconnect the boiler electrical mains
B Power ON the appliance
CC? go to 2
yes go to 3
no B Replace the outside temperature sensors.
B Power ON the appliance
CC? go to 3
yes CC? go to 4
no B Replace the cable.
B Reconnect the boiler electrical mains
connection.
B Power ON the appliance.
CC? go to 4
B Reconnect the boiler electrical mains connection.
B Power ON the appliance.
B Make a note of the altered service function settings.
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change the control board PCB.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted.
RECTIFYING FAULTS
37