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Help needed... Firstly, just to head people off, my heater fan is fine on all speeds, so not the usual problem.

My problem is that the temperature control knob has to be on full to get heat (then it belts it out). It turns off on any other setting, even if I adjust it back a fraction. So I have to control heat output by turning the whole heating between full on and full off, with settings in between not working

In my day before everything was improved by electronics (!) It would have been a rheostat problem... I suspected a coding issue. Local garage found no code faults but reset them anyway and it worked normally for a few days then the problem came back as before.

Any ideas anybody?
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