Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect the inline connector to the DHW microswitch
Remove microswitch from diverter valve body
Remove microswitch from diverter valve body
Measurement:
Test 1:
Measure the resistance between the two pins inside the connector to the DHW microswitch.
Expect continuity / zero resistance.
Test 2:
Gently press the switch of the microswitch and fix in the "pressed in position" using tape or a cable tie.
Expect open circuit.
Are the resistances measured as expected?
Measure the resistance between the two pins inside the connector to the DHW microswitch.
Expect continuity / zero resistance.
Test 2:
Gently press the switch of the microswitch and fix in the "pressed in position" using tape or a cable tie.
Expect open circuit.
Are the resistances measured as expected?
Isolate as per TOPs P4
and refit as necessary