Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect HMI cable at the PCB
Gain access to User Interaction PCB ensuring that the
DHW temperature control is set to MAX 65°C
Gain access to User Interaction PCB ensuring that the
DHW temperature control is set to MAX 65°C
Measurement:
Test 1. Measure for resistance across the DHW temperature potentiometer at test point 1 as illustrated - Expected resistance 0 - 10 ohms.
Test 2. Measure for resistance across the DHW temperature potentiometer at test point 2 as illustrated - Expected resistance approximately 2.4 Kohms.
Test 2. Measure for resistance across the DHW temperature potentiometer at test point 2 as illustrated - Expected resistance approximately 2.4 Kohms.
Isolate as per TOPs P4
and refit as necessary