Supplied By www.heating spares.co Tel. 0161 620 6677
RECTIFYING FAULTS
8 716 115 748 (2009/09)
40
E2
and fault indicator LED are flashing.
Flow temperature NTC sensor defective.
Check
Action
1.
B
Check if the flow temperature
NTC sensor connector is
corroded, damaged or dirty.
yes:
B
Change relative parts.
E2? go to 2
no:
go to 2
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?
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
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.
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.
Tab. 23 E2 Error codes