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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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  • Anonymous Mar 18, 2014

    ygmi unit

  • Anonymous Mar 31, 2014

    Each time I turn on my split unit, it will work for about five minutes and blew the little 5amp fuse at the circuit board of the indoor unit. I have replaced fuse twice.Please advice.

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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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Posted on Jan 02, 2017

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you will need to replace the fuse as this protects the bridge rectifier and triac from overload
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Hi,
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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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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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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