Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Gain access to interface PCB (use insulation MAT as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Test 1. Set CH temperature control to MAX position.
Measure for DC voltage across test point 1 & 3.
Expected voltage approximately 0 Vdc.
Test 2. Set CH temperature control to MIN position,
confirm spindle rotates potentiometer as control is adjusted.
Measure for DC voltage at the same test points as test 1.
Expected voltage approximately 4.9 Vdc.
Measure for DC voltage across test point 1 & 3.
Expected voltage approximately 0 Vdc.
Test 2. Set CH temperature control to MIN position,
confirm spindle rotates potentiometer as control is adjusted.
Measure for DC voltage at the same test points as test 1.
Expected voltage approximately 4.9 Vdc.
