Set Appliance State:

CH Demand
CH temperature control to max
ON/OFF switch ON
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Apply a CH demand to the appliance.
Allow fan to run and boiler to fire and reach a working temp of around 45°C.
Remove demand and allow boiler to shut down.
Reinstate the CH demand a delay of approximately 20 minutes before boiler re-fires is expected.
Note:
Anti-cycle time is preset at 20 minutes, but is dependent upon appliance temperature and can be less. This can be altered in the boiler parameters.