Set Appliance State:

Set Multimeter to DC Volts Set meter to measure DC Volts
Isolate Mains Power to appliance as per TOPs P4
Ease connector J1 slightly off PCB to expose the silver strip to
allow for testing with probes
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the voltage between the Grey (2) and the White (3) on connector J1
on the main PCB Connector.
The voltage will vary according to system pressure.
Approx voltage should be between 1.7 -1.9 volts DC
System pressureVoltage DC
0 bar1.2
1 bar 1.7
2 bar2.2
3 bar2.8