Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Ensure system pressure is set between 0.6 and 1.5bar
Remove control box cover if necessary
Remove control box cover if necessary
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the voltage between the red wire from the low pressure switch on X22 and the neutral at the incoming mains terminal strip, with the connector X22 attached to the PCB.
Expect approximately:
1.3vdc at 0.6 bar and 2.5vdc at 1.5bar.
Expect approximately:
1.3vdc at 0.6 bar and 2.5vdc at 1.5bar.
Isolate as per TOPs P4
and refit as necessary