Set Appliance State:

CH Demand
Ensure all external controls are calling for heat
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Once a demand for Central heating is placed does the pump run?
NOTE:
This boiler has a pump overrun and therefore the pump MUST be wired into the boilers pump output. If the boiler cannot control the pump there is risk of noise and overheating after a demand.