Supplied By www.heating spares.co Tel. 0161 620 6677
RECTIFYING FAULTS
8 716 115 748 (2009/09)
39
d6
and fault indicator LED are flashing. (Boiler not available for demands)
Tank overheat thermostat defective
Check
Action
1.
B
Power OFF the appliance.
B
Disconnect the boiler mains
connection.
Check if thermostat is connected
on PCB via ST9
yes
go to 2
no
B
Ensure that ST9 is plugged onto the PCB.
B
Reconnect the boiler electrical mains.
B
Power ON the appliance
d6? go to 4
2.
B
Disconnect lead on thermostat.
Measure the thermostat for
continuity.
Is there continuity?
yes
B
Reconnect lead on thermostat.
go to 3
no
B
Change thermostat.
B
Reconnect lead on thermostat.
B
Reconnect the boiler electrical mains
connection.
B
Power ON the appliance
d6? go to 4
3.
B
unplug connector ST9.
Test harness for continuity.
Is there continuity?
yes
d6? go to 4
no
B
Change or fix wiring to thermostat.
B
Reconnect the boiler electrical mains
connection.
B
Power ON the appliance.
d6? go to 4
4.
The PCB control board is damaged.
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.
Tab. 22 d6 Error codes