Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect M11 from PCB
Measurement:
Test 1:
With DHW temperature selector set to MAX, measure the
resistance across the blue wire (A) and the black wire (C).
Resistance measured should be approximately 10.5kΩ
Turn DHW temperature selector to MIN.
Resistance should reduce to less than 100Ω.
Test 2:
With DHW temperature selector set at MIN, measure the
resistance across the white wire (B) and the black wire (C).
Resistance measured should be approximately 10.5 kΩ.
Turn DHW temperature selector to MAX.
Resistance should reduce to less than 100Ω.
With DHW temperature selector set to MAX, measure the
resistance across the blue wire (A) and the black wire (C).
Resistance measured should be approximately 10.5kΩ
Turn DHW temperature selector to MIN.
Resistance should reduce to less than 100Ω.
Test 2:
With DHW temperature selector set at MIN, measure the
resistance across the white wire (B) and the black wire (C).
Resistance measured should be approximately 10.5 kΩ.
Turn DHW temperature selector to MAX.
Resistance should reduce to less than 100Ω.
Isolate as per TOPs P4
and refit as necessary