Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove diverter valve head from body
Measurement:
Observe the position of the spindle in the diverter valve head.
If the spindle is extended (Heating Position) expect approximately 6Kohms between Pins 2 and 3.
If the spindle is retracted (Hot Water Position) expect approximately 6Kohms between Pins 1 and 2.
The spindle may be not be fully in one position so also test for 6Kohm between Pins 1 and 2 / Pins 2 and 3, and for continuity between Pins 1 and 3 .
If the spindle is extended (Heating Position) expect approximately 6Kohms between Pins 2 and 3.
If the spindle is retracted (Hot Water Position) expect approximately 6Kohms between Pins 1 and 2.
The spindle may be not be fully in one position so also test for 6Kohm between Pins 1 and 2 / Pins 2 and 3, and for continuity between Pins 1 and 3 .
Isolate as per TOPs P4
and refit as necessary