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Air conditioning unit not running but fan keeps running even though thermostat is turned to off, auto, and temp set to highest position 90degrees. 3 amp fuse keeps blowing on the circuit board in the blower compartment. I replaced it 3 times then installed a new thermostat. no change. I can usually figure it out if I got a little input or direction. Any help would be deeply appreciated. I would much rather have a trained expert easily repair my hvac unit but I can only call the professionals in as my financial situation is dictating that I must first try myself.

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If the fuse is blowing then this is generally indicative of a short in the low voltage wiring, isolate the wires on the thermostat and the unit ends, use an ohmmeter to verify that there is no path for continuity with no wires touching, if there is then you must pull new t-stat wire to the thermostat, (a guess would be that the green and red are shorted, by the symtoms you gave.

Posted on Jul 20, 2009

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