Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Remove boiler case if you have not already done so
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Boiler will do a self-check whenever power is restored to the boiler (AP shown on display).
For two minutes the boiler should operate as below:
  • Fan runs constantly (fault code displayed after short period if it does not)
  • Pump runs at 5 seconds intervals
  • Sprayaway pump on standby - solid light after approx. 5 seconds
    If the boiler detects a fault during this time it will interrupt the self check and display the code.
    Self check is complete when the display changes and the fan / pump stop running.