Worcester CDi Combi N.G Service Booklet page 40

RECTIFYING FAULTS
E2
and fault indicator LED are flashing.
Flow temperature NTC sensor defective.
Check
1. B Check if the flow temperature
NTC sensor connector is
corroded, damaged or dirty.
2. B Switch OFF the appliance.
B Disconnect the boiler power
connection.
B Unplug 20-pin connector from
PCB.
B Check resistance from
connections 8 to 9 on the cable
side. Does the value match the
ones described in table 38,
page 71?
3. B Un-plug NTC sensor from cable.
B Check resistance of NTC sensor.
Does the value match the ones
described in table 38, page 71?
B Reconnect the appliance power
connection.
Tab. 23 E2 Error codes
40
Supplied By www.heating spares.co Tel. 0161 620 6677
Action
yes: B Change relative parts.
E2? go to 2
no: go to 2
yes: B Reconnect the boiler electrical connection.
B Switch ON the appliance.
B Make a note of the altered service function settings
(see table 6 on page 18) in order to keep the altered
values.
B Switch OFF the appliance.
B Disconnect the boiler power connection.
B Change PCB control board.
B Reconnect the appliance power connection.
B Switch ON the appliance.
B Restore service settings previously noted down.
no: go to 3
yes: B Switch OFF the appliance.
B Disconnect the boiler power connection.
B Change the 20-pin connector lead assembly.
B Reconnect the boiler electrical connection.
B Switch ON the appliance.
no: B Change NTC sensor.
8 716 115 748 (2009/09)