Set Appliance State:

Mains Power Off
CH Demand
Gas On
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Set boiler control switch to H position.
Allow the boiler to ignite and run for approximately 1 minute.
Set boiler control switch to O position.
Wait until the boiler returns to standby.
Does the pump overrun for approximately 3 minutes?
Note:
When pump overrun is operating a small 'c' should be shown on the display.