Set Appliance State:

Ensure NO demands
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset boiler, wait 10 seconds after power is reinstated, press and hold reset button for 5 seconds, then release.
Does the pump run (see note)?
Note.
After boiler has been reset the pump will run for approximately 25 seconds then begin to pulse and stop (normal operation), total duration is approximately 65 seconds, reset boiler as required until test complete.