Set Appliance State:
Gas Off
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Allow boiler self check to complete.
Hold down the button for at least 5 seconds to enable service mode.
(MAX should be shown on the display).
Measure the voltage across pin 5 (brown)
and pin 6 (blue) on connector HV1.
Mains voltage expected.
To turn service mode off press the button once.
Hold down the button for at least 5 seconds to enable service mode.
(MAX should be shown on the display).
Measure the voltage across pin 5 (brown)
and pin 6 (blue) on connector HV1.
Mains voltage expected.
To turn service mode off press the button once.
Isolate as per TOPs P4
and refit as necessary