Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
CH Demand
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Approximately 30 seconds after the fan starts measure the voltage between the blue and brown wires at CON14 on the PCB.
Mains voltage should be present.
Note:
Gas valve plug may look different (no blank pins).
It is in the same location and voltage does not change.
Mains voltage should be present.
Note:
Gas valve plug may look different (no blank pins).
It is in the same location and voltage does not change.
Isolate as per TOPs P4
and refit as necessary