Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Turn Hot Water Tap On
Disconnect plug connector (marked ST16) from PCB
Measurement:
Check resistance across connections 19 & 20 (pink wires).
Note:
Care should be taken that probe tips do not touch each other when taking measurement as a false reading will be given. Also ensure that other end of leads are connected to the diverter valve microswitch.
Note:
Care should be taken that probe tips do not touch each other when taking measurement as a false reading will be given. Also ensure that other end of leads are connected to the diverter valve microswitch.
Isolate as per TOPs P4
and refit as necessary