87 Audi 5000 heater/airconditioner problem

My 87 Audi 5000 heater/airconditioner suddenly only works in the lowest temparature position.
When pushing the temperature control buttons on the dashboard,
there is no response. The screen only shows: the letters "low"
My question:
Could this be the control unit (with the buttons on the dashboard)?
Or.
a thermostat, bad connection, etc. ?
Any ideas?
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Sure you are not talking about a '97 rather than '87 ?
The '87 didn't have an alpha display, just LED indicators by the buttons.
Audi climate control system are rather complex so it could be a number of things . Most likely a problem in the controller (under dash) or the programmer (on dash). Could also be wiring connections like a bad ground.
Marti wrote:

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