Set Appliance State:

Mains Power Off
CH Demand
ON/OFF Switch in ON position
CH Temp Selector in Maximum position
DHW Temp Selector in Minimum position
Mode Selector Switch in Heat and Hot water position
Gas On
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Allow boiler to ignite under heating demand.
Remove heating demand and allow burner to shut down.
Re-instate heating demand.
Is there a delay of approximately 5 minutes before the boiler re-ignites?