Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove ignition PCB from gas valve and remove cover,
leave connectors in place
Remove connector to diverter valve
Multimeter probe required for this test is the thin long spike

Measurement:

Test 1. Measure for continuity (short circuit) between pin 2 (X7 PCB)
and black lead diverter valve connector.
Test 2. Measure for continuity (short circuit) between pin 6 (X7 PCB)
and blue lead diverter valve connector.
Test 3. Measure for continuity (short circuit) between pin 7 (X7 PCB)
and red lead diverter valve connector.
Test 4. Measure for continuity (short circuit) between pin 7 (X7 PCB)
and yellow lead diverter valve connector.
Note.
Due to the small size of the connectors used on this appliance, harness checks are carried out from PCB connections.