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Transformer burned out - Air Conditioners

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  • meccie Nov 16, 2008

    I replaced the thermostat on my Carrier AC and evidently shorted out something probably the TRANSFORMER and now I have nothing going to the thermostat. If I have a transformer I cannnot locate it. I need to know where the transformer is and how it is wired.


  • meccie May 11, 2010

    I thought the same thing but I cannot find the fuse. By the way I did have a short at the thermostat.


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I found my problem it was a fuse. The hadest thing was finding where the fuse was located. I kept looking and taking apart until lo and behold it was in the unit inside behind the big plate. I replaced the fuse 5amp and every thing is ***** dodey. I hope some one gets some use from this article.

Posted on Nov 16, 2008

I took care of the problem. I think my unit is older than 10 yrs. and it did not have a fuse protection, but I installed a fuse and now it's protected. The problem was at the thermostat, for some strange reason the thermostat burned out. Well, it was not a strange reason, the friend who helped me cleaned the unit ...He shorted out the thermostat. So I went and got a new one and also a new transformer. The unit is up and running like new!

I thank everyone for their input...

Posted on Oct 15, 2008

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Usually if a tranformer burns out you have a short in the 24v side of the system. What type of system do you have? Most units built within the last 10 yrs should have some type of fuse protection.

Posted on Oct 14, 2008

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I install a new limit switch and now something keep burning out the transformer i replace it also and something keep burning it out what the problem could be

All transformer comes with a current limit specification in terms of VA units. For example a 24 v secondary coil with 6 VA specification only can hold a current of of 4 amps for a short period of time. So to prevent that it burned out you only pass an 80% of that current, then it really can hold 3.2 amps continuously.
Other possibles causes for burning the transformer are:
1. Accidentally connecting the primary and secondary reversed, the secondary can not manage the voltage and current of the primary .
2. A coil or device that is connected to the secondary is demanding to much current because is shorted or stuck in a position causing an increase on current.
3. The primary have multiple taps to operate on different voltages and the combination is wrong.
3. Faulty wiring. Some times the insulation of the wires became worm, cracked or melted, with the wires torches the metal a short is produced and the transformer burns. Check the wires carefully.

Hope these tips help,.

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Call an electricist. You might have some serious problem in the transformer. That ·humming" sound might be the transformer burning out!

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The only thing that would cause this is something in the circuit is pulling too much electricity through that transformer. So what is the transformer hooked to? Please post the make and model

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They do sell kits that you can buy to parallel wire both transformers. You can also power both transformers from one furnace. Do a search on youtube and you should be able to see how it's done.

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The transformer is burnt out... you will need to replace it... this is common and they burn out easily if a low voltage wire it shorted even for a split second, or if there is a brown out...

They best way to prevent this is by installing a 5 amp fuse ahead of the transformer in the high voltage line so that it blows before the transformer goes...


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