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Friedrich Mini-Split blowing fuse

I have a Friedrich Mini-Split AC unit that keeps blowing the 10 amp time delay fuse.  After replacing the fuse the unit will run for 20 to 30 minutes and then blows the fuse again. Any ideas?

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Re: Friedrich Mini-Split blowing fuse

Low voltage shorts can be a real pain to find!!! i would try a process of ellimination: first i would try to elliminate the thermostat. then id look for a wire that is vibrating on something in the cabinet.

Posted on Oct 16, 2007

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Fuse keeps blowing on my Whynter portable ac

Is your compressors motor capacitor replaceable? I know that on a split system, a dead capacitor (typically a 35uF) can cause increased current draw, to the point of blowing fuses, though I've never had to replace one on a portable unit. I usually replace them with a 30uF capacitor, roughly the size of a "200ml can of softdrink".
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I have a Eaton-Cuttler-Hammer 60 Amp fusible Pullout Disconnect for my house AC unit. When the weather gets warm and the AC runs alot, one, or both, of the fuses blows. The plastic panal inside the metal...

Does not matter which way the fuses go....
The contacts are bad and will cause the fuses to blow sooner because they are heating up...
It will not cause a fire, but you should have the disconnect replaced or you will have continuous problems...


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I have a TRANE XR12 central AC UNIT, when i turn my thermostat on i get a click sound and ac unit does not come on. i checked the circuit breaker to make sure it's on.i have not turned this ac on for a...

There is a time delay on the stat to the AC unit, in addition the AC unit likely has one also, so immediate activation as desired isnt likely, however in 10 minutes of asking for AC if its not on still Id check the time delay fuses in the service disconnect at the AC unit, its a small grey box with the power cords running to and from it, there is 2 time delay fuses inside this box.

Jan 12, 2011 | Air Conditioners

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Fuses on AC unit keeps blowing need solution can't continue to b replacing fuses

are the fuses time delay if they are not then get them ..try cleaning the coil on the roof with a garden hose .if the coil is dirty the unit uses more amps to run causing fuses to blow /or you may need a new start capacitor for the compressor /fan its the round silver thing with wires connected to it .when you take it apart to clean ..good luck let me know../joe/

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1 Answer

The inside unit on my Bryant is working. The fan is on. However the outside unit is not running. I changed fuses and it worked for approxmately 20 minutes then stopped again. Any suggestions?

I would think that when you changed the fuses you 'cured' the problem - which was a blown fuse(s) - but now you have the same problem again - a bad fuse(s).

To test this - you could replace the fuses again - but first - I would make sure that the fuses you are using are 'time-delay' fuses. It should say on the fuse itself 'time-delay' or 'dual-delay' or something like that.

If you're using fuses that are not 'time-delay' your problem could be solved as easy as buying some 'time-delay' fuses.

However, -- fuses blowing -- are usually caused by electrical motors - i.e. compressor/fan motors - breaking down 'electrically' - and heating up and causing the amp draw to increase past the point of the fuses, i.e. a 40 amp fuse will blow when the AC starts to exceeds that rating.

One "longshot possibility" - is - if the condenser is 'really dirty' - it will cause the compressor to run hot and possibly cause the fuses to blow. I would make sure 'all power' including the inside thermostat is "off" - and then 'wash out' the condenser (the coil in the outside unit) real good with a water hose.

Of course another possibility is that you have a loose electrical connection(s) somewhere in the AC. If you're inclined to - you can again - make sure all power is off - and poke around in your AC looking for loose wire connections. Just be sure 'all power' is off before you do this.

If you are using 'time-delay' fuses and your condenser is 'clean' and you can't find any 'loose connections' - and you continue to have the same problem (blowing fuses) - I would suggest calling a Service Tech.

Note: never replace a fuse with a bigger fuse, i.e. if the fuses in your unit are 40 amp - 'do not' put in 50 amps.

It is possible that the fuse(s) you are using are not the 'right size' but that would have to be determined by a Service Tech and actually - is not a strong possibility, although certaintly possible.

hope this helps

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Turn the power off ,and check all the electrical connections for loose connection or wires. also make sure these are slow blown timmed delayed and not one-time fuses. Thank-you verymuch!

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It is probably either the Compressor and or the capacitor that has failed. The compressor will hum and pull a lot of amps when it has seized up. Sounds like it is time for a new unit.

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