Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Test 1:
Measure the voltage across the live (marked L) and the Earth terminal on the main connector block at the front of the control box.
Test 2:
Measure the voltage across the neutral (marked N and the Earth terminal on the main connector block at the front of the control box.
Measure the voltage across the live (marked L) and the Earth terminal on the main connector block at the front of the control box.
Test 2:
Measure the voltage across the neutral (marked N and the Earth terminal on the main connector block at the front of the control box.
Isolate as per TOPs P4
and refit as necessary