Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connector J3 from the PCB
Measurement:
Measure the resistance between pins 6 and 7 (black) on connector J3.
Is open circuit or continuity/zero resistance measured?
Note:
If a frost thermostat is fitted wires will be present in pins 6 and 7.
Is open circuit or continuity/zero resistance measured?
Note:
If a frost thermostat is fitted wires will be present in pins 6 and 7.
Isolate as per TOPs P4
and refit as necessary