Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Gain access to PCB (use Insulation Mat as required)

Measurement:

Check that there is no sign of water ingress near X14 on the PCB.
Check that the connector fits securely.
Note:
It is advisable to check the whole PCB for
water ingress but fault code is related to X14.