Re: Lux frost free fridge freezer
This model has Euroflec electronic control with 2 ntc thermistors, main pcb, display pcb, defrost heater and drain heater. I would guess that either the defrost heater is o/c, or the main pcb or evaporator ntc has failed. You can measure the resistance of the heaters and the ntcs from the foamed-in connectors behind the freezer rear plastic panel. If either of the ntcs fail you should get the 3 leds flashing on the display board.
You can put it into service mode to test the operation of the compressor, fans and heaters. If you want to test the fans be careful; they operate at 18Vdc.
It’s worth getting the TDS offline disc which gives you all the information you need; service mode, faults indication, schematic diagram.
Thermistors
°C Ohm
10 5348 ±0.6
5 6818 ±0.4
0 8758 ±0.4
-5 11337 ±0.4
-10 14795 ±0.6
-15 19475 ±0.7
-20 25862 ±0.8
-25 34666 ±0.9
-30 46921 ±1
-35 64161 ±1
-40 88577 ±1