Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Observe the burner through the sight glass.
Does the burner ignite and establish correctly?
Note:
The appliance will have 3 attempts before lockout occurs.
Reset as required.
If fault code AL 15 appears you must click HERE to avoid misdiagnosis.