Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector X2B from the PCB
(5 way connector 6th from the left)
(5 way connector 6th from the left)
Measurement:
Test 1.
Measure for resistance across the brown & blue wires of connector X2B.
Expected resistance greater than 1 MOhm.
Test 2.
Measure for resistance across the brown wire of connector X2B and a suitable earth connection.
Expected resistance greater than 1 MOhm.
Measure for resistance across the brown & blue wires of connector X2B.
Expected resistance greater than 1 MOhm.
Test 2.
Measure for resistance across the brown wire of connector X2B and a suitable earth connection.
Expected resistance greater than 1 MOhm.
Isolate as per TOPs P4
and refit as necessary