Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove ignition PCB from gas valve and remove cover,
leave connectors in place
Remove connections to DHW thermistor
leave connectors in place
Remove connections to DHW thermistor
Measurement:
Test 1. Measure for continuity (short circuit) between
pin 7 (X8 PCB) and yellow lead removed connector.
Test 2. Measure for continuity (short circuit) between
pin 15 (X8 PCB) and green lead removed connector.
Note.
Due to the small size of the connectors used on this appliance,
harness checks are carried out from PCB connections.
pin 7 (X8 PCB) and yellow lead removed connector.
Test 2. Measure for continuity (short circuit) between
pin 15 (X8 PCB) and green lead removed connector.
Note.
Due to the small size of the connectors used on this appliance,
harness checks are carried out from PCB connections.
Isolate as per TOPs P4
and refit as necessary