Set Appliance State:

Mains Power Off
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance, press and hold the reset button until the chimney
sweep button led flashes rapidly, then release the reset button.
Does the appliance reset?
Note.
1. If after appliance reset the error code changes from the original to a different error code, then CLICK HERE.
2. If the error code is a recurring issue, then it may be that the components previously tested have intermittent faults, check electrical connections, water ingress, replace and/or repair as required.