Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Gain access to flow switch inline connector
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
With the hot tap fully open, measure the voltage between the green and black wires on the inline connector.
Expected voltage approximately 3V DC.
Expected voltage approximately 3V DC.
Isolate as per TOPs P4
and refit as necessary