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 pin 9 from the low pressure switch on X22 and a suitable earth connection , 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