Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
CH Demand
Pull connector X3 back slightly to expose test points
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance as necessary.
Measure the voltage between pin 1 (blue) and pin 3 (black) at X3 on the PCB.
At 15 second intervals 24V DC should be measured
for 4 seconds as power is sent to the gas valve, this
will be repeated 5 times until lockout occurs.
Is the voltage measured as expected?
Notes:
1. Timings / voltages quoted are approximate.
2. Reset appliance and repeat test as necessary until outcome is determined.
Measure the voltage between pin 1 (blue) and pin 3 (black) at X3 on the PCB.
At 15 second intervals 24V DC should be measured
for 4 seconds as power is sent to the gas valve, this
will be repeated 5 times until lockout occurs.
Is the voltage measured as expected?
Notes:
1. Timings / voltages quoted are approximate.
2. Reset appliance and repeat test as necessary until outcome is determined.
Isolate as per TOPs P4
and refit as necessary