Set Appliance State:

Mains Power Off
CH Demand
Selector switch to DHW and CH position
CH temperature selector to maximum
DHW temperature selector to minimum
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow system to heat to approximately 60 degrees C.
Turn CH temperature selector to minimum - burner should go out.
Turn CH temp selector to maximum.
Is there a delay of approximately 1-3 minutes before burner re-ignites?