Set Appliance State:

Mains Power Off
NO Demands
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset the appliance.
(Press and hold the power button for 4 seconds then release)
Allow the appliance to complete its 1 minute self check.
If fault code 'communication fault' or "spare part invalid" appears on the display click HERE