Set Appliance State:
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Isolate Mains Power to appliance as per TOPs P4
Gain access to PCB (use insulation mat as required)
Turn Hot Water Tap on
Gain access to PCB (use insulation mat as required)
Turn Hot Water Tap on
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the DC voltage across Yellow connections on connector X2 (Modureg).
At max voltage should be approximately 20vdc
At max voltage should be approximately 20vdc
Isolate as per TOPs P4
and refit as necessary