Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Gain access to DHW flow sensor connections
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Test 1.
With No DHW demand present measure for DC voltage across the flow sensor connections.
Expected voltage approximately 5 Vdc.
Test 2.
Turn hot water tap On, repeat voltage measurement as per test 1.
Expected voltage approximately 0 Vdc.
With No DHW demand present measure for DC voltage across the flow sensor connections.
Expected voltage approximately 5 Vdc.
Test 2.
Turn hot water tap On, repeat voltage measurement as per test 1.
Expected voltage approximately 0 Vdc.
