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What causes compressor terminals to blow out?

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There could be several causes, but the most common are these two..
1. Loose connections to the terminals.
2. Over-amperage on the terminal.

Posted on Sep 18, 2008

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What I would do is see if maybe a terminal on the compressor is burnt. Easy fix. Looked up the model number to no avail. If you have separate capacitors for fan and compressor I would look for a swollen failed capacitor. Check and see if the compressor termials all have continuity with each other. If you read an open circuit between any 2 terminals on the compressor then the compressor is shot

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The 3 amp fuse on the control board of my furnace blows often when the heat comes on and immediately when the A/C comes on. I got a new thermostat. Can the blue and yellow wires for the A/C be switched...


Yes if the wires are on the wrong terminals the fuse will blow.
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Hi i replace 3 lg compressor 12000btu and i feel i did everything corrently but my compressor burnt ,and turns of the circuit breaker.i have check the voltage which is 240,current 5.6amp and psi 55...


dear sir

i think you did wrong connection with compressor please make sure first your connection is correct then install your compressor unit make vacuum in unit and then try to fill freon also use over load protectors in compressor for security .correct connection are giving you blow :

C : connect here wire which one is coming from main supply/thermostat /overload protectors

R :connect here wire which one is coming from capacitor ( C terminal).

S : connect here wire which one coming from H terminal of capacitor if capaciter/if capacitor is no mark then one wire i mean no require from H OR C terminal .

hope answer the question
thank you
please vote!

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1 Answer

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Without troubleshooting with a meter to make sure more often than not the dual capacitor is the reason that the fan blows but the compressor does not start.

This is the part for your model that we are talking about:
http://www.repairclinic.com/SSPartDetail.aspx?s=t-M6Y12F2A-82WA%2fC-%3d%3di1111541&PartID=1111541

You can test you old one if your good with an analog meter by simply reversing the leads across the terminals on an R X1000 or higher setting on the meter. The meter should jump give a momentary reading and drop return to infinity. Only 2 of the 3 terminals will show meter movement. Mind you you must make sure the unit is unplugged while testing.

Thanks for using FixYa

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the fact that the compressor light is coming on tells me power is being sent to the compressor.

if that is true then there is really only 2 possibilities.

1) you have a wire (or maybe 2) burnt away from the terminal(s). To repair this is fairly simple for the service tech but somewhat complex for the inexperienced, so I won't go into here - but if this is the problem you can probably (with a little expert help) fix it yourself.

2) the compressor is not starting even though voltage is being applied to it's terminals. Usually this is caused by the compressor being 'electrically open,' and there is nothing that can be done except to change out the compressor.

good luck!

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