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)
DHW temperature selector to Max
DHW temperature selector to Max
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Test 1:
Measure the voltage between the grey wires on connector CN1 at the PCB.
With no demands and pump not running
expect a voltage of approximately 5 - 35V DC.
Test 2:
Turn hot water tap ON.
Again measure the voltage between the
grey wires on connector CN1 at the PCB.
Shortly after the pump begins to run the voltage
should drop from the inital reading to approximately 0V DC.
Measure the voltage between the grey wires on connector CN1 at the PCB.
With no demands and pump not running
expect a voltage of approximately 5 - 35V DC.
Test 2:
Turn hot water tap ON.
Again measure the voltage between the
grey wires on connector CN1 at the PCB.
Shortly after the pump begins to run the voltage
should drop from the inital reading to approximately 0V DC.
