Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Remove control box cover if necessary
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure voltage across the yellow and red contacts of the flow turbine inline connector.
Voltages should be measured as in the range below.
Voltages should be measured as in the range below.
Isolate as per TOPs P4
and refit as necessary