#3 AMP FUSE HOW TO#
#3 AMP FUSE PRO#

#3 AMP FUSE HOW TO#

If you find the low voltage wire at the condenser is the reason your 3 amp fuse is blowing here is how to repair it. I have seen quite often there is a connection under the insulation and when I expose it that is where it is shorting out. If this is the case you will need to carefully cut the tape and insulation so you can check the whole wire. Some times the low voltage wire will come out of the condenser and be hidden under the line-set insulation and or tape.

If the copper wire is exposed and touches the copper line or the shell of the condenser it will also short out the fuse. If the copper wire touches one of the other copper wires it will short out the fuse. Some times it’s very obvious and you can see exposed wires or wire nuts and the insulation will be dry rot and having the copper of the low voltage wire fully exposed. Check the wire carefully to ensure the outer coating of the low voltage wire is intact. If the wire is exposed and fully visible you will easily be able to trace it from the condenser all the way to the location it enters the home. You will see the brown or tan colored wire coming out of the bottom of the electrical compartment of the condenser. Go outside to the location of your condenser. This is one of the most common issues that cause the fuse to blow on the inside circuit board. One of the low voltage wires may be shorting out causing the 3 amp fuse to blow.

#3 AMP FUSE PRO#

The short pro tool is amazing at helping you find the reason the 3 amp fuse is blowing.īut regardless if you have the tool or not you may still want to just do a quick visual of the items I have listed below to see if you can find the problem. You can further isolate it by reconnecting the wire that you just took off and removing connections further down the line, like at the thermostat itself. If the LED goes out on the tool then you know the problem is somewhere down that line. Remove the HOT wire from the board or terminal strip. Start with the wiring going to the thermostat. Finding exactly where the short is located is now just a matter of removing circuits (WIRES) until the LED light goes out. If the LED light on the Short-Pro tool is lit up then you know you have a short. Place the system thermostat in the OFF mode and Fan in the auto mode.į. Place each alligator clip on one of the fuse holder contacts.Į. For inline fuses open the fuse holder and remove the fuse. For plastic-style fuses remove the fuse and simply place one end of the alligator clip on the fuse holder contacts.ĭ.

If the system has a 24v fuse on the transformer’s output, attach the short pros leads to the terminals where the blown fuse was.Ĭ. You will need basic hand tools to replace the part when you find it.ī.

The rest of the numbered sections below will be how to troubleshoot your 3 amp fuse blowing by doing some simple steps without any specialized tools. Short Pro Tool To Troubleshoot 3 Amp Fuse Here are the steps for troubleshooting with the short pro tool to figure out why your AC keeps blowing the 3 amp fuse.Ī. The board is bad and the 3 amp fuse keeps blowing. The contactor is bad which is causing the 3 amp fuse to blow A bad thermostat with a direct short is causing the 3 amp fuse to blow The low voltage wires are connected wrong and the 3 amp fuse is blowing Make sure to insert another 3 amp fuse in the board.If you find the low voltage wire at the condenser is the reason your 3 amp fuse is blowing here is how to repair it.Use a simple tool to troubleshoot 3 amp fuse blowing.