A/C Problems

I am not familiar with residential AC units.

A 24 volt signal would initiate at a transformer which would most likely be inside the AC unit itself. After the voltage is stepped down from the transformer there will likely be some form of circuit protection like a fuse of circuit breaker. That should also be inside the unit. Follow the conduit going into the unit and go from there.

Good luck.

If I read you right you have an AC unit with a condenser unit outside where you caught the control wire for the condenser switching (Not that you shorted out your thermostat) with your weed eater.

The refrigeration coils are in the plenum of your furnace. The transformer for the 24 volt control voltage should be next to or inside the furnace control box.

I will bet if you turn the unit thermostat to heat the furnace will not come on either.

I am not a refrigeration mechanic, just a good electrician. The units I have looked at in the past were arranged as I said. I have never seen a fuse on either the primary or the secondary of the control transformer but it is possible.

It is also possible your splice in the control wire is bad or that you burned out a transformer which is questionable but I think you will now be able to find the transformer, determine the components of that circuit, and trace the fault.

Let me know if I am right.

j.

There are 2 doors on your furnace, the top goes to the heating element and the circuit board. These covers don't swing open, they are lift and pull covers.(I am guessing that you already know this but for other readers who may not know this will be helpful).You will find the wiring diagram on the inside cover. There should be a 3A fuse on the board beside the electrical connections. If it's a newer unit it will look like an automotive fuse, older units have Buss fuses.

It should take more than a minor short to fry the transformer but it's possible. Also try to ring out the lines from/to each point, you may still have a short or open in the wire somewhere.Maybe in the wall where it leaves/enters the house.

Good luck.

Please post your findings.