Set Appliance State:
Set Multimeter to Resistance 
Isolate Mains Power to appliance as per TOPs P4
CH thermostat to MAX position
Release the front facia by gently prising up the retaining latches at the top of the facia
CH thermostat to MAX 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 CH switch.
Expected resistance approximately 5 - 200 Ohms.
Test 2.
Repeat test between the back of the potentiometer and the R/H connection on the back of the CH switch.
Expected resistance approximately 200 - 500 Ohms.
Measure resistance between the back of the potentiometer and the L/H connection on the back of the CH switch.
Expected resistance approximately 5 - 200 Ohms.
Test 2.
Repeat test between the back of the potentiometer and the R/H connection on the back of the CH switch.
Expected resistance approximately 200 - 500 Ohms.
