Set Appliance State:

Mains Power Off
Set Multimeter to AC Volts Set meter to measure AC Volts
CH Demand
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Locate connector X14 on the PCB, top right hand corner.
Check the voltage at this connector
(this is the supply from the PCB to the external pump).
Expect mains voltage.
Note:
It is possible to check the pumps power status using the on board diagnostics - d.10.
It is advisable however to check the voltage as described above.