Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove ST9 connector from the PCB
If available use the Worcester test PCB to assist resistance test
If available use the Worcester test PCB to assist resistance test
Measurement:
Measure for resistance across pins 3 & 4 (purple)
and 5 & 6 (purple) of ST9 connector.
Expect a resistance of approximately 400 ohms on one pair of purple wires and approximately 180 ohms on the other pair.
Note:
Gas valve connectors can be fitted in any configuration.
and 5 & 6 (purple) of ST9 connector.
Expect a resistance of approximately 400 ohms on one pair of purple wires and approximately 180 ohms on the other pair.
Note:
Gas valve connectors can be fitted in any configuration.
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Isolate as per TOPs P4
and refit as necessary