Set Appliance State:

CH temperature control to max
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Does the boiler reset?
Turn selector switch from ch/dhw position to the off/reset position, after a couple of seconds turn the selector switch back to the ch/dhw position.
Overheat.
Led flashes red every 1-second.
Boiler reset.
Led flashes green once every 5-seconds (no demand).
BOILER RESETS
BOILER REMAINS IN OVERHEAT LOCKOUT