Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
CH Demand
Selector Switch to Hot Water and Heating
Gain access to PCB (use insulation mat as necessary)
Remove connector from spark generator and make safe
Gain access to PCB (use insulation mat as necessary)
Remove connector from spark generator and make safe
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow fan to run.
Using shrouded probes measure voltage across the outer brown and blue terminals on the PCB at X2 on the front of the lowered control box.
Exact voltage will vary but it should be at least 100V DC.
Make a note of the voltage recorded as it will be needed on the next test.
Note:
Voltage will only be present approx. 8-10 seconds after mains power is turned on.
The voltage will only be present for around 4 seconds.
Reset boiler and repeat test as necessary
Using shrouded probes measure voltage across the outer brown and blue terminals on the PCB at X2 on the front of the lowered control box.
Exact voltage will vary but it should be at least 100V DC.
Make a note of the voltage recorded as it will be needed on the next test.
Note:
Voltage will only be present approx. 8-10 seconds after mains power is turned on.
The voltage will only be present for around 4 seconds.
Reset boiler and repeat test as necessary
Isolate as per TOPs P4
and refit as necessary