Question about Dometic Rooftop RV Air Conditioner

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A/c tripping breaker during peak heat of day ,coils clean,filter clean,pulling about 16 amps while running 15000 btu straight cool

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Chances are you have a bad breaker or loose wires on the breaker. What size breaker do you have on unit. Heat of the day plus full load on the unit could cause it to trip. Rus

Posted on Jun 28, 2009

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Breakers get weak over time. Sounds like the breaker needs to be replaced. Check all wire connections for tight (if the wire is aluminum loosen slightly then re-tighten). If that doen't solve the problem, replace the breaker.

Posted on Jun 29, 2009

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1 Answer

LGWHD1500ER 12 amp 15,000 btu Window a/c unit.


the condenser is in the hot sun and the fan that moves the air is not cooling or removing the heat from the condenser fins
This places the head pressure of the compressor too high and so the circuit breaker trips from the excessive current draw to run the compressor under this load
The answer to this problem is to place shade cloth on a frame which covers the air conditioner by placing it in a shady area
another solution is to replace it with a split system where the outside unit can be placed away from the sun

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A thermostat or a relay activated by the thermostat turns power on to the capacitor for the compressor.

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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

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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 | Heating & Cooling

1 Answer

I have an older RV 1979 Dodge Class C The roof AC unit runs and cools great of the evening but in the heat of the Day in runs and cools great for 30 mins to a hour then the compressor kicks out, Wait an...


This is a fairly common problem with older AC's, especially ones on a RV. As they age they start to break down (electrically/mechanically) a little, and therefore when the load is the greatest, i.e. the heat of the day, they will pull a little more amps (than what they and the breaker is rated at) and trip the breaker. This is a pretty good indication that either the fan motor or the compressor could be on it's last legs.
Not exactly what you wanted to hear I bet?
There is some other possibility's, however.
1. if the system has been opened (a easy way to tell this is if - 'service ports' - have been added in order to charge the unit) - it's possible that whoever 'charged it' - put just a little too much refrigerant (an overcharge unit will pull more amps) in it. The best way to tell this is to put gauges on it and check the running pressures - during the heat of the day. It's possible that someone knowledgeable with AC's - could 'fine tune' your charge and eliminate this problem. Note: obviously if you do not have 'service ports' then an overcharged system is not your problem.
2. The breaker might be getting 'weak' and tripping early. I don't think of this as a good possibility, (since breakers are usually good or bad) - but, you might want to think about replacing the breaker. Also, it's possible that the breaker is not rated high enough to handle the AC. I would check with an electrician and see if he/she thought your breaker was sufficiently sized right.
3. you might have a fan or compressor - 'capacitor' (silver or gray oblong electrical devices) going bad or already bad. This is a remote possibility but if upon examination you see one or both of the capacitor's with a 'bulge,' then I would swap it. Note: Usually capacitors that go bad - have a bulge - but they can be bad and not have a bulge.
hope this helps.

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1 Answer

Have Lg 12,000 btu hooked to a 20amp breaker 20 amp receptacle and it runs for 7 hours and trips the breaker?


Hi,
You may have abad breaher or the unit may be pulling too much current...an experienced service person can tell you what is happening...

heatman101

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http://www.fixya.com/support/r3850183-condenser_coil_cleaning_condenser_coil

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Whats the amp breaker? Is this for the inside unit or the outside condenser? If the inside and gas heat you have a bad fan motor, If its an electric furnace , the same, but if its the outside unit, the fan could be going bad, locking up and the compressor still runs and pulls high ampsand tripps breaker or the compressor is just pulling too many amps due to plugged coils with dirt , grass or weeds blocking airflow.(koolbreezes74401@yahoo.com)

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change thermostate switch.its means yr thermostate switch donot working.the heater running cotinusly,this is the reason for over heat.

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