carrier ac fuse box
carrier ac fuse location
I have an attic mounted Carrier Air Conditioner that is fairly new. Most of the year it works fine, but it consistently blows a 5A fuse when I first turn it on after it has been off for an extended period of time (e.g., turning it on for the first time in the spring, or turning it on after a week of cool weather).
I did not find any evidence of water accumulation in the unit, nor could I see any obvious failed capacitors.
Is it possible that the thermostat is wired incorrectly?
The blown fuse is shown below (I replaced it prior to taking this photo).5A
1 Answer
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1
Fuse On the Circuit Board Blowing
Low Voltage Breaker Trip
In your case, you likely have a dead short somewhere in the wiring or a bad load that is going short to ground causing the fuse to blow. Furthermore, I would remove all the control wires from the board. Make sure you have a good fuse and then reattach them one at a time.
Furthermore, when the fuse blows you will know which wire is causing the problem. Or which wire has the dead short or bad load. Then it is a simple matter of tracing it out to make sure the wire is okay. If the wire is fine with no dead shorts, then you look at the load. An example of this would be a relay or contactor.
Relays and contactors have coils in them that are energized through the wire. If the coil gets a dead short in it then there is your problem. Replace the relay or contactor and problem solved.