Set Appliance State:

Set Multimeter to AC Volts Set meter to measure AC Volts
Ensure No demands are present
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Reset boiler as required.
Allow the boiler to commence self check mode.
Measure for A/C voltage across the condensate pump terminals.
Expected voltage mains voltage (see note).
Note.
Voltage may only be present for approximately 20 seconds after boiler is reset, repeat test from set state as required,