Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove the cover from the water pressure switch
This will just pull backwards down the wiring
Disconnect the wires from the water pressure switch
Note:
Ensure that the system is pressurised before undertaking this test.
This will just pull backwards down the wiring
Disconnect the wires from the water pressure switch
Note:
Ensure that the system is pressurised before undertaking this test.
Measurement:
Measure the resistance between the exposed
terminals of the water pressure switch.
terminals of the water pressure switch.
Isolate as per TOPs P4
and refit as necessary