Question about Heating & Cooling
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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Posted on Jan 02, 2017
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