Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to AC Volts Set meter to measure AC Volts
Gain access to PCB (use Insulation Mat as required)
Programmer or selector switch set to hot water only
Heating temperature selector to OFF
Hot water temperature selector to maximum
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure voltage across connection 1 (pink wire) on connector X2 and connection 3 (neutral, blue wire) on connector X11 on the PCB.