Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Gain access to display PCB
Ensure power has been off to boiler for at least 10 seconds (or it will not carry out self-check)
Ensure power has been off to boiler for at least 10 seconds (or it will not carry out self-check)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow fan to run for self-check.
Measure the voltage between pin 2 (purple) and pin 5 (white) at X5 on the display PCB.
Voltage should be approximately 6V DC.
Note:
Fan purge runs for approximately 90 seconds, repeat test as required
(turning power off for at least 10 seconds to allow fan purge)
Measure the voltage between pin 2 (purple) and pin 5 (white) at X5 on the display PCB.
Voltage should be approximately 6V DC.
Note:
Fan purge runs for approximately 90 seconds, repeat test as required
(turning power off for at least 10 seconds to allow fan purge)
Isolate as per TOPs P4
and refit as necessary