Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to DC Volts Set meter to measure DC Volts
Gain access to PCB (use Insulation Mat as required)
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

There is no need to wait for the fan purge to finish before commencing this test.
Measure the DC voltage between pin 7 on connector X5 and a suitable earth.
Voltages depend on system pressure (refer to the manual pressure gauge) and should conform approximately to the table below:
Pressure (bar)DC Volts
0.50.7
1 1
1.51.2
21.5
2.51.7