Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect X8 from the PCB
Measurement:
Check for continuity (zero resistance) between pin 5 (grey) at the disconnected plug to the grey wire at the plug marked "Weather Compensation" at the low voltage terminal block.
Check for continuity (zero resistance) between pin 4 (black) at the disconnected plug to the black wire at the plug marked "Weather Compensation" at the low voltage terminal block.
Inspect harness and connectors for good overall condition.
Check for continuity (zero resistance) between pin 4 (black) at the disconnected plug to the black wire at the plug marked "Weather Compensation" at the low voltage terminal block.
Inspect harness and connectors for good overall condition.
Isolate as per TOPs P4
and refit as necessary