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There is no good way to get the codes except a Volvo specific scan tool or a PC type scanner with software that looks at everything.
The first suggestion is that the cabin temp sensor is clogged with dust. Get a nozel on a vacuum cleaner and try to suck some of it out. It is the small grill just to the left of the radio/climate control.
Moving the blower speed to something other than auto will negate the automatic function of the ECC unit. You blower will work without the ECC being functional, you just have to make all of the settings manually.
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Klausc, a Volvoholic
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