Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Cancel purge cycle & If required, reset boiler.
With the fan running measure for DC voltage across
pin 2 at CN10 to a suitable earth connection.
Voltage should be approximately 6V DC.
Note.
Boiler may enter lockout during test, reset boiler as required until test complete
With the fan running measure for DC voltage across
pin 2 at CN10 to a suitable earth connection.
Voltage should be approximately 6V DC.
Note.
Boiler may enter lockout during test, reset boiler as required until test complete
Isolate as per TOPs P4
and refit as necessary