This can be a very tricky repair, but I’ll make it easy on you. A shorted or grounded wire is usually in the thermostat wire.

Pull off all the thermostat wires from the circuit board.

Now give the machine power and take notice of whether the fuse blows again.

If the fuse does not blow then you have just confirmed that the thermostat wires are in fact you r short. Now let’s figure out which one.

Hook up 1 wire at a time always taking note to whether or not the fuse blows when you attach a wire. If you hook up a wire and the fuse blows then you know that was the shorted wire so pull it back off and use a different color wire instead of that shorted one.

If there are no extra wires to use then you need to run an entire new thermostat wire.

After running your new wire you should be done.

Move to end page to see if the air conditioner is repaired or if we need to restart matrix.