Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect ST9 connector from the right hand side of the PCB.
Note: There are different versions of this appliance, connections to the gas valve can be 2 x purple leads
or blue and purple leads, the gas valve can be either a SIT or PRETTLE/JUNKERS gas valve
Note: There are different versions of this appliance, connections to the gas valve can be 2 x purple leads
or blue and purple leads, the gas valve can be either a SIT or PRETTLE/JUNKERS gas valve
Measurement:
Identify the gas valve fitted to the appliance (sit or prettle/junkers).
Measure resistance across gas valve connections on connector ST9.
Measure resistance across gas valve connections on connector ST9.
Isolate as per TOPs P4
and refit as necessary