Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Remove the connector from the diverter valve motor and make safe
NO demands
NO demands
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Test 1:
Press the reset button on the front of the appliance and while the boiler runs its start up sequence measure the dc voltage between pin 7 (blue) on connector X2 and a suitable earth.
Expect the voltage to fluctuate between 0 and 22 vdc and then settle at 22 vdc after approximately 5 seconds.
Test 2:
Press the reset button on the front of the appliance and while the boiler runs its start up sequence measure the dc voltage between pin 17 (brown) on connector X2 and a suitable earth.
Expect the voltage to fluctuate between 0 and 22 vdc and then settle at 22 vdc after approximately 5 seconds.
Press the reset button on the front of the appliance and while the boiler runs its start up sequence measure the dc voltage between pin 7 (blue) on connector X2 and a suitable earth.
Expect the voltage to fluctuate between 0 and 22 vdc and then settle at 22 vdc after approximately 5 seconds.
Test 2:
Press the reset button on the front of the appliance and while the boiler runs its start up sequence measure the dc voltage between pin 17 (brown) on connector X2 and a suitable earth.
Expect the voltage to fluctuate between 0 and 22 vdc and then settle at 22 vdc after approximately 5 seconds.
 lower section.gif)
 pcb in situ.gif)
 connector x2 on pcb.gif)
Isolate as per TOPs P4
and refit as necessary