Air Conditioning - a/c problems-keeps blowing prple fuse on circuit board

Hello again,

I posted a problem on 10-01-04 about a purple fuse on the circuit board that keeps blowing. the whole scenario is outlined on a thread titled,"a/c has no power"-dated 10-01-04(4:01 A.M.)......Please help. :confused:

there is a short in the low volt circuit. does it blow with everything "off"?

Did you get the short fixed in the bathroom? You've got a direct short and without a multi-meter to trace it out you're at a dead end.

i will assume you dont have a heat pump. if you do, the instructions will be slightly different. assuming it is the low voltage fuse, a short is indicated. the most prominent location for a short is in the wire that goes to the condenser from the thermostat. these are small wires about the size of a mechanical pencil lead.......one of these wires should be yellow, maybe blue, this one comes from t-stat.. the other will be common...this one comes from the air handler itself...(((((do this first)))))..the first order of business is to check the wire at the outside unit for obvious wire damage, if ya have a dog, he will probably tell you that he did it. this is usually a brown wire with 2 or more conductors inside, usually travels alongside the copper lines. if the is no obvious damage there, the next thing to do is to locate this wire in the inside unit. if you can, disconnect these two wires going to the outside unit(power off), power up unit, thermostat to cool, temp way down. if fuse doesnt blow, you have narrowed down the search. reconnect the two wires, go to the outside unit, power off, disconnect the same two wires there, you will have to take access panel off. protect these two wires as they will have voltage on them when powered up. power up unit, settign to cool again, fuse blows, wire is defective and damaged under the house or attic, wherever is runs. if the fuse doesnt blow, you probably have a bad contactor or in the case of a heat pump, a bad circuit board is the most common, in the outside unit. not worth discussing at this juncture because the most common palce in the condenser wire.

All, please refer to the other thread. This isn't nearly as simple as it sounds.

hewnew, as mattison asked, has the problem in the bathroom been resolved? Any status update.

Doug M