Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Gain access to PCB (use Insulation Mat as required)
Ensure No demands are present
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

1. With power re-instated to the boiler, do the PCB LED's illuminate (self-check & purge cycle) after approximately 15 seconds, if they do proceed to step 2, if not choose option "PCB LEDS DO NOT ILLUMINATE " from below.
2. The self-check & purge cycle will last approximately 2 minutes, during the self-check & purge cycle the pump should run for approximately 20 seconds then off for 20 seconds repeating.
Does the PCB LED's & pump operate as described?