Set Appliance State:

Mains Power Off
CH Demand
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 for 5 seconds, then release).
Observe how long it takes for the fault code, volatile lockout to be displayed after appliance reset?
Note.
If a fault code other than volatile lockout is displayed CLICK HERE