blowing fuses

honeywellEW07 · #1 Dec 5, 2007, 05:05 PM

Had new thermostat installed,most everything on this york unit has been checked,couldn't find a problem,boards,contacts,relays all checked out to be fine,still blowing 5 amp fuse when calling for heat??????

Stratmando · Dec 5, 2007, 05:17 PM

Remove wires to heat contactor coil, if it blows, maybe shorted windings. Also verify no load when coil(control) wires are removed. White wire is sometimes used for heat.



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