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We have a Honeywell Chromotherm III thermostat and it has an error message "-AC". No fan, AC, heat, etc. Any ideas?

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I almost think you have no power source to the thermostat as if the power is off to the air handler unit (furnace), or the 24 volt transformer is bad. Could well be that the error codes are being powered by the battery.

Posted on Jul 24, 2008

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