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:
Measure the voltage between LR with a radiator symbol on the yellow connector and the 230V OUT "N" terminal on the white connector at the PCB.
Expect mains voltage.
Is the voltage measured as expected?
Note:
The appearance and layout of the incoming mains connector can vary depending on the PCB version, follow the appropriate image.
Expect mains voltage.
Is the voltage measured as expected?
Note:
The appearance and layout of the incoming mains connector can vary depending on the PCB version, follow the appropriate image.
Isolate as per TOPs P4
and refit as necessary