Dashboard heater controls (20 Viewers)

[Plazmapete]

Hi all. We have a 2019 caradoi449. The dashboard heater controls only work on full.1 2 and 3 don't work. We have fitted a new resistor that slots in next to the fan motor, but it's still the same. Where else could we look??
Thanks

 

[Plazmapete]

Forgot to say. It's a fiat ducato.

 

[Diabalo]

The control itself maybe faulty.

 

[Guigsy]

Was the connector and loom immediately upstream of the resistor pack ok? Mine was toasted and needed replacement too.