When I turn on any function on the heating / aircon on my 1999 75 connoisseur 2.5 the temperature on both sides reads 22'C, then immediately changes to an "er" error message. This stays there even when turned off and only goes away completely when the ignition is switched off.
All the functions seem to work but seem to be fixed at one temperature,which I assume is 22'C.
The only related issue is that the rear window heater seems to have stopped working at the same time.
I have:
- checked fuses and relays for rear heater
- done a battery reset
- changed the aircon ECU
Any ideas most welcome