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Compresor not coming on. Keeps blowing 3 amp fuse. wire was cut on outside unit and spliced back together.

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You have a short in your low voltage circuit replace the thermostat wire between the A/C and the furnace
this will solve the problem for sure

Posted on Apr 05, 2011

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I searched forever for an answer to this and never found one. So this is what I did when you take the cover off on the left hand side there are two switches with two wires coming from.each switch. Then in the same group of wires the is two slightly larger wires one red one black. Those wires go to the optic eye that tells the machine is full. Cut and splice these teo wires together coming from the circuit board this will tell the machine it is empty and should make ice. Worked for me. It just doesn't cut off on its own whenever its full.

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the 3 amp fuse protects low voltage side of transformer. if it's blowing on a call for cooling wire pair going to outside unit bad or contactor in outside unit.

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means that the melted wires are not damaged up to where you found them,but went further into the circuit wiring . cut the outside cover to further up til you find the ***** wire which surely are connected and that's why you are having blown fuses.

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Furnice air blows, but my ac unit outside want cut on


if the inside unit is running but the outside unit isn't - I would check the fuses or breaker. I suspect you have a blown fuse or a tripped breaker.
What is also possible is that the 'low voltage' thermostat wire (coming from the thermostat inside the house) has been cut - possibly by a lawn mower or weed eater - or chewed into by a dog.
If this is the case - you easily splice (with all power off) the wires back together using the color of the individual wires.

Jun 06, 2011 | Heating & Cooling

1 Answer

Outside unit won't come on. Drain pas appears dry/.


if nothing comes on (on the outside unit) when you turn on AC (and the inside unit runs ok) I would check the fuses and/or the breaker for the outside unit. I would suspect a fuse blown or a breaker tripped. It's also possible that your 'low voltage' (24V) thermostat wire has been cut (by lawn mower) or chewed into (by dog). If the problem is the low voltage wire you can easily splice it back together - just be sure all power is off.

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Just wondering if you can help me with a electrial wiring problem? the wires have melted together and dont know which one is the earth as they keep blowing the fuses


I would think your best bet is to cut out the melted section and reconnect (through splices) the wires. They should be color coded, so you should know which wires connect together.

If you get the wires separated where the melted part is, spliced together, and properly insulated, which one is the ground really shouldn't matter. You have removed the point where the positive is touching the negative, and the fuse blowing should stop.

I would suggest you use heat shrink tubing to insulate the spliced wires.

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Ac unit will not come on


pull the fuse/breaker disconnect panel outside by unit and main breaker inside,remove compressor access panel,re-power unit trace your thermostat wires to the terminals by compressor and short the two term together and see if unit starts,sounds as though you broke wire in more than one place.good luck be careful doing this,its 240 volts at most compressors on a central A/C

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2 Answers

Blowing 3amp fuses


You have a low voltage short. A lot of low voltage shorts come from the wires that go out to the outdoor unit. Go outside and inspect those wires and that they are in good condition. Also check for any splices in those wires that they haven't degraded in any way. This is the only thing that will blow the fuse. That's why it's only 3 amps and based on the size of your fuse, it's a gas fired unit right? Have a great day!

Apr 10, 2009 | Ruud UBHC Air Conditioner

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