Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Remove connector from the diverter valve and make safe
Ensure NO demands
Ensure 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, while the boiler runs its start up sequence measure the dc voltage between pin 7 (blue) on connector X2 and the earth point on the boiler chassis.
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, while the boiler runs its start up sequence measure the dc voltage between pin 17 (brown) on connector X2 and the earth point on the boiler chassis.
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, while the boiler runs its start up sequence measure the dc voltage between pin 7 (blue) on connector X2 and the earth point on the boiler chassis.
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, while the boiler runs its start up sequence measure the dc voltage between pin 17 (brown) on connector X2 and the earth point on the boiler chassis.
Expect the voltage to fluctuate between 0 and 22 vdc and then settle at 22 vdc after approximately 5 seconds.
Isolate as per TOPs P4
and refit as necessary