Set Appliance State:

Mains Power Off
Selector switch set to CH/DHW
Preheat switched OFF
CH temperature control set to MAX
DHW temperature control set to MAX
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Test 1.
Apply a CH demand and allow boiler to run for 2 minutes, then remove CH demand.
Fan and pump should both run for approximately 4 minutes.
Test 2.
Apply a DHW demand and allow boiler to run for 2 minutes, then remove DHW demand.
Fan should run for approximately 4 minutes and the pump
for approximately 60 seconds.