Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove both leads from Water Pressure Switch
Ensure system is pressurised correctly
Ensure system is pressurised correctly
Measurement:
Measure resistance across terminals of Water Pressure Switch.
Is the resistance short circuit?
Note:
Water Pressure Switch has three terminals, one of which is not used and should be covered with plastic sleeve.
Is the resistance short circuit?
Note:
Water Pressure Switch has three terminals, one of which is not used and should be covered with plastic sleeve.
Isolate as per TOPs P4
and refit as necessary