Set Appliance State:
Set Multimeter to Resistance 
Isolate Mains Power to appliance as per TOPs P4
DHW switch in ECO position
Release the front facia by gently prising up the retaining latches at the top of the facia
DHW switch in ECO position
Release the front facia by gently prising up the retaining latches at the top of the facia
Measurement:
Test 1.
Measure resistance between the back of the potentiometer and the L/H connection on the back of the DHW switch.
Expected resistance approximately 2.6kOhms.
Test 2.
Repeat test between the back of the potentiometer and the R/H connection on the back of the DHW switch.
Expected resistance approximately 2.7kOhms.
Measure resistance between the back of the potentiometer and the L/H connection on the back of the DHW switch.
Expected resistance approximately 2.6kOhms.
Test 2.
Repeat test between the back of the potentiometer and the R/H connection on the back of the DHW switch.
Expected resistance approximately 2.7kOhms.
