Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Remove PCB Cover
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Observe the reset switch mechanism while resetting the appliance with the control knob / selector switch.
Can the mechanism be seen to move as the appliance is reset?
(As shown in the picture)
Does the fan now run?
Reset switch moves as above but fan still does not run
Reset switch moves as above, fan now runs
Reset switch does not move