Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Run hot water tap at flow rate of 3 l/min
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure for A/C voltage between the white wire pin 4 on connector X22 and a suitable earth, with the connector X22 attached to the PCB.
Expected voltage of approximately 1.7 Vac (voltage may be seen to fluctuate).
Is the voltage measured as expected?
Expected voltage of approximately 1.7 Vac (voltage may be seen to fluctuate).
Is the voltage measured as expected?
