Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
This test can be carried out during the purge cycle.
Measure the DC voltage between pin 1 (blue) on connector X3 and a suitable earth point.
Expect either 0 vdc or 4.9 Vdc.
Measure the DC voltage between pin 1 (blue) on connector X3 and a suitable earth point.
Expect either 0 vdc or 4.9 Vdc.
Isolate as per TOPs P4
and refit as necessary