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)
Ensure No demands are present
Ensure No demands are present
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Test 1.
Measure for DC voltage across pin 1 of connector X10 and a suitable earth connection.
Expected voltage approximately 5.0 Vdc (see note).
Test 2.
Turn DHW tap On with a flow rate set @ 3 litres/min.
Measure for DC voltage across pin 1 of connector X10 and a suitable earth connection.
Expected voltage approximately 0 Vdc.
Note.
Connector & pin numbers are printed on the PCB.
Measure for DC voltage across pin 1 of connector X10 and a suitable earth connection.
Expected voltage approximately 5.0 Vdc (see note).
Test 2.
Turn DHW tap On with a flow rate set @ 3 litres/min.
Measure for DC voltage across pin 1 of connector X10 and a suitable earth connection.
Expected voltage approximately 0 Vdc.
Note.
Connector & pin numbers are printed on the PCB.
