Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to DC Volts Set meter to measure DC Volts
Turn Hot Water Tap On
Gain access to PCB (use Insulation Mat as required)
Flow rate set @ 3 litres/min
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure for DC voltage across pin 1 of connector X10 and a suitable earth connection.
Expected voltage approximately 3.0 Vdc (see note).
Note.
Connector & pin numbers are printed on the PCB.