Set Appliance State:

Mains Power Off
Appliance switched off.
Models with a two position switch, switch to off.
Models with a three position switch, switch to central position.
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Is the Orange Neon illuminated?
If neon is not illuminated check whether appliance has an EMC filter fitted and select appropriate option.
Note:
Filter is located top, rear L/H side of the appliance, adjacent to the flue.
This filter will not be fitted on appliances prior to late 1995.