Set Appliance State:

Mains Power Off
On/Off Switch OFF
CH temperature switch to maximum
DHW temperature switch to maximum
Create a demand either by turning the hot tap on or using the external controls
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Turn On/Off switch to On.
The following sequence should occur:
Fan runs
Sparking present
Burner ignites and establishes
Please choose the appropriate symptom from the options below: