Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Use Insulation Mat as required
Disconnect the plug from the diverter motor and make safe
No demands
Disconnect the plug from the diverter motor and make safe
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 15 and a suitable earth.
Expect voltage to fluctuate between 0 vdc, 12 vdc and 22 vdc twice before settling on 0 vdc after approximately 5 seconds. Repeat test on pin 16.
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 7 wire and a suitable earth.
Expect voltage to fluctuate between 0 vdc, 12 vdc and 22V DC twice before settling on 22 vdc after approximately 5 seconds. Repeat test on pin 8.
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 15 and a suitable earth.
Expect voltage to fluctuate between 0 vdc, 12 vdc and 22 vdc twice before settling on 0 vdc after approximately 5 seconds. Repeat test on pin 16.
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 7 wire and a suitable earth.
Expect voltage to fluctuate between 0 vdc, 12 vdc and 22V DC twice before settling on 22 vdc after approximately 5 seconds. Repeat test on pin 8.
Isolate as per TOPs P4
and refit as necessary