Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Gain access to PCB (use Insulation Mat as required)
Hot Water Tap OFF
Hot Water Tap OFF
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance as necessary.
Test 1:
Measure the voltage between pin 9 (red)
and pin 10 (black) on connector J7 at the control PCB.
Voltage should be approximately 5V DC or greater.
Test 2:
Turn hot water tap ON.
As before measure the voltage between pin 9 (red)
and pin 10 (black) on connector J7 at the control PCB.
Shortly after the pump begins to run the
voltage should drop to approximately 0V DC.
Test 1:
Measure the voltage between pin 9 (red)
and pin 10 (black) on connector J7 at the control PCB.
Voltage should be approximately 5V DC or greater.
Test 2:
Turn hot water tap ON.
As before measure the voltage between pin 9 (red)
and pin 10 (black) on connector J7 at the control PCB.
Shortly after the pump begins to run the
voltage should drop to approximately 0V DC.
