Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
CH Demand
Gain access to main PCB wiring
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow self-check to complete.
Measure the voltage between the central brown wire (pin 3)
at X1 on the main PCB to a suitable earth point.
Mains voltage should be present.
Note:
Ensure a good connection is made or misdiagnosis will occur.
Measure the voltage between the central brown wire (pin 3)
at X1 on the main PCB to a suitable earth point.
Mains voltage should be present.
Note:
Ensure a good connection is made or misdiagnosis will occur.
Isolate as per TOPs P4
and refit as necessary