Set Appliance State:

CH Demand
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance if required.
Does the burner ignite and establish correctly? (see note.)
Note.
1. If a fault code other than E133 occurs click HERE.
2. It may take up to 60 seconds for the ignition sequence to start when a CH demand has been applied.
3. Reset appliance as required.