Set Appliance State:

Mains Power Off
Mode selector switch to Off/Reset position
CH Demand
Central heating temperature control set to maximum
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Mode selector switch to CH position.
Allow system to heat to approximately 60°C.
Turn central heating temperature control set to minimum - burner should go out.
Turn central heating temperature control set to maximum.
Is there a delay of approximately 3 minutes before burner re-ignites?