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A c unit goes into defrost too soon then it will possibly go out of defrost and hiss loudly current draw rises over 20 amps trips breaker model is a L G L 12463hl 7 k w wall split

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It sounds like the head pressure is to high. This is sometimes do to overcharging. The hissing noise that you hear is the liquid refrigerant dumping into the suction side. This is what a compressor does when the Head pressure is way too high. The fact that it is tripping the breaker may be to a broken suction valve in the compressor. I think it might be time for a new unit.

Posted on Jul 03, 2008

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There seems to be a electric short cut that is tripping the breaker. The unit works for about 5 minutes and then the breaker trips and the unit stops working.


Sounds like to me that the ac units is drawing too much current for the size of breaker that you, have, check to see if it is on an 15 amp breaker

Oct 08, 2016 | Frigidaire FAS256N2A Air Conditioner

1 Answer

I have 2 15000 BTU A/C units run to a double pole 20 amp each breaker. The breaker keeps over heating and one side will trip. Should i separate the units on their own breaker? The units cool and run fine...


That would work, if for no other reason, to isolate which one may be drawing too much/more amperage. Keep in mind as well, after a breaker trips too many times, it usually will get weak and trip at lower amperage. If all is same, ( wiring from AC units) and units are cleaned regularily and no other internal problems such as weak, bad, capacitors etc, they should both draw same or close to same. If possible that someone has a multimeter with amp draw clamp, that would confirm where trouble is.

Aug 09, 2011 | Dometic Rooftop RV Air Conditioner

2 Answers

Ac works for abut 15 minutes, then pops breaker


First there should be no extension cord, plug the cord from the unit straight into the wall, the plugs ins should have very firm connection. Then my next recommendation would be to clean the out door coil, a dirty coil will prevent heat rejection, and draw high amps, loose electrical connections will cause the breaker to trip as well. Good luck

Jul 12, 2011 | Air Conditioners

1 Answer

My unit is tripping the main breaker what should i look at first


With this cold weather, -- it is not likely tripping off because it is too hot!

Are you familiar with the history of this unit?-- Like has it tripped in the past during HOT weather?
This might be a clue, that the circuit is really loaded close to its limit--

This leads to the next possibility: That the breaker is getting weak (They do after many hard starting loads!
Now-- If you can get the system to start and run for just a few seconds-- can you put a Clamp around Amp meter on the wires?-- and read the full load current?
How close is this to the rating of the circuit breaker?
Is the breaker, and the wire size marginal?

Another thing to look for, is loose lug screws at the main fuses, and the Main contactors, and the motor leads--- for loose wires result in overheating, which raises the current, and leads to tripping, too.

How long ago was the condenser cleaned-- this leads to high amp draw too.

But the first thing would be to learn more about the age of the Main Breaker, and what the 'normal' run current is for that system.

Mack B

Dec 28, 2010 | Carrier 38CKC036 Air Conditioner

1 Answer

AC runs for 5 minutes and then circuit breaker


What else do you have running on hydro while AC is running? Such as coffee maker, microwave, water heater, fridge. That 30 amp breaker is your main breaker I assume, or breaker on pole your plugged in to. Keep in mind your AC will normally draw approx. 15-17+ amps momentarily when compressor kicks in to cool, then drop back to 12-15 amps when running normal. If your AC is drawing too much current, then you would only normally trip 20 amp breaker for AC in your panel. Try switching other appliances to gas operation while running AC, such as water heater, and fridge. Make sure incoming voltage is up to specs as well . (115-120 volts)
If water heater takes 5-8 amps, and fridge takes same when they are calling for power, you'll be close or over the 20amp mark when you consider your on board converter etc. as well. That only leaves approx 10 amps for AC that requires approx 15 amps to run, and up to 20amps when compressor kicks in. If you switch all those other items over to propane, and it still happens, then a current draw test should be done on AC unit to see if perhaps a capacitor is faulty, or possible compressor faulty.

Jul 22, 2010 | Dometic Rooftop RV Air Conditioner

2 Answers

My unit was working fine until 3 days ago when the breaker tripped, I reset the breaker and worked fine for a day then tripped again when it tripped both the ac breaker andthe main in the trailer as well...


High amp draw can be caused by a few different things, so first check that incoming voltage to trailer is sufficient. (115 volts) Not unusual for some parks to install more hydro hook-ups on a feed line, and when all are up and running, your incoming voltage could be decreased. If your o.k. that way, then I'd start looking at the compressor circuit of your ac, in particular, the compressor start-up capacitor. The capacitor basically stores electricity and boosts it to higher voltage for compressor and fan start-ups to reduce current draw that will trip the breaker. Please have a knowledgeable electrician, or RV tech check this for you, as a capacitor can give a real good high voltage (possible fatal) shock, even when power is off to unit. I also suspect that the start relay has shorted (welded) itself due to high amp draw situation, and that is reason it comes on by itself.

Jun 21, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Central AC unit replaced breaker trips after running 20min


Unit is drawing two may amps for the breaker. Could be compressor sticking.

Jul 22, 2009 | Weather King 10AJA6001AH Air Conditioner

2 Answers

Circuit breaker overheating on rooftop ac after


Possible overcharge or bad breaker. You need to check the amp draw for the unit. If you draw under full load amps and trips breaker breaker is bad.Rus

Jul 13, 2009 | Dometic Rooftop RV Air Conditioner

3 Answers

Fan works, but if A/C turned on, trips breaker within a few minut


You need to verify if the problem is the unit or the breaker.  To do this, you will need to measure the current it is pulling from the power source.
If the unit is pulling too much current, then the unit is the problem.  If the unit is pulling as much or less than its rated current draw, then the circuit breaker is worn out.
The units WILL pull more power when hot outside.  It should not trip a breaker unless something is wrong with either the unit or the breaker.
A current draw test will tell you for sure.
If it's not the breaker, then it's probably low refigerant causing the issue.

Jul 08, 2009 | Dometic Rooftop RV Air Conditioner

3 Answers

My ac circuit breaker keep tripping


If your outside condenser has a locked rotor or short circuit, than the unit WILL trip the breaker - as it should. On the other hand if a breaker is tripped a few times it will have less of a capacity that the rating, (this is designed in it). You will need to determine if the unit is locked (and broken) or the breaker has become too sensitive.

Apr 20, 2008 | Air Conditioners

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