Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to AC Volts Set meter to measure AC Volts
Turn Hot Water Tap On
Move connector ST5 to expose terminals on PCB
Remove PCB cover as necessary, use isolation mat as required
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure for AC voltage across brown terminal and
the white terminal at the connector ST5 on the PCB
Expected voltage 115 VAC when fan running.