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 pins 10
and 11 (black wires) on connector X2 at the PCB.
Voltage should be 15V DC or greater.
Test 2:
Turn hot water tap ON.
As before measure the voltage between pins 10
and 11 (black wires) on connector X2 at the PCB.
Shortly after the pump begins to run the
voltage should drop to approximately 0V DC.
Test 1:
Measure the voltage between pins 10
and 11 (black wires) on connector X2 at the PCB.
Voltage should be 15V DC or greater.
Test 2:
Turn hot water tap ON.
As before measure the voltage between pins 10
and 11 (black wires) on connector X2 at the PCB.
Shortly after the pump begins to run the
voltage should drop to approximately 0V DC.
