Set Appliance State:

Mains Power Off
Ensure there is no demand for either CH or DHW
Preheat OFF
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

At power up the fan should run for 4min, approximately 5sec after the fan starts the pump should run and continue for 20sec.
Did the fan and pump run at power up as described?