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.
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Isolate as per TOPs P4
and refit as necessary