Question about Dometic Rooftop RV Air Conditioner

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My a/c will run and cool great but keeps kicking the 20 amp circuit breaker even when no other appliance is running.

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The compressor is bad or unit is very dirty/dusty...which will hold the heat in around the compressor... when it overheats, it draws more current...eventually past 20 amps so the breaker will kick out.....try to clean it and allow the air to circulate around the compressor to remove the built up heat....if that doesn't work then the compressor is definately bad...

Posted on Jul 25, 2009

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A 20 amp circuit breaker should be sufficient enough to do the job unless the breaker itself is too old, or if the connection screws on the breaker are not tight enough.

Posted on Jul 25, 2009

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2 Answers

Keeps tripping breaker after using for an hour or so. I have already replaced gfi and breaker. Advice please.


Usually when a breaker trips it is either loose wire or the what ever is running uses too much current or is failing.

Mar 20, 2015 | Electrical Supplies

1 Answer

I have a new furnace and the breaker keeps tripping (20/30). It is a bryant westinghouse box. I think 200 amphes


1) You got a FIRE truck coming.

2) Wire is too small.
Problem is NOT circuit breaker.

3) Both 240Volt appliances on same breaker is a hazard, especially if space available in 200 amp service panel for more breakers.

4) Usually each 240V appliance has separate breaker.

5) Circuit breaker trips because of High heat on the wire.
If wire gets hot, it will start a fire inside the wall.

Electric code requires wire-size match breaker-size.

6) If you put larger amp breaker on same wire that is getting hot, then wire will get hotter.
Result: FIRE truck middle of night with folks jumping out window in glass-cut bare run across yard.

7) Each appliance has volts and watt rating on label.
EVERY appliance has label.

8) For example stove might be rated 8000 watts and 240Volt.
8000 watts divided by 240 volts = 33.3 amps
Stove would require 40 amp breaker and 8 gauge wire.

9) How to figure it out:
http://waterheatertimer.org/Color-codewire.html
http://waterheatertimer.org/How-to-install-a-subpanel.html

10) Do same calculation for new furnace.
12000 watt furnace divided by 240 volts = 50 amps.
Use 60 amp breaker and 6 gauge wire.

11) Summary: fixya wants you to be safe, and buy stuff showing in the ads.
Use a bigger breaker ONLY when bigger wire is also installed.
Call furnace installer, the installer should know to check safe wiring before installing.

Nov 04, 2012 | Bryant Westinghouse Bqc Quad Circuit...

1 Answer

Hi I have a Lincoln Handy Mig I am running 0.30 wire welding a roll cage on a race car the welder keeps overheating {light keeps coming on} wont weld just sputters keeps kicking the breaker {20 amp}...


check to see if the cooling fan is working. put a box fan behind the welder so it will blow threw the vents on the rear, or better yet remove the side cover and let the fan blow into the side of the welder.if this works replace the cooling can......GOOD LUCK

Jan 29, 2011 | Lincoln Welding Tools

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

1 Answer

Fridge keeps blowing the breaker


Depending on what is causing the breaker to blow will be important to know. Refrigerators do draw a good bit of power on a 20 amp circuit especially when the refrigerator goes into defrost. Refrigerators are made to run on a 20 amp circuit without other machines or appliances using the same power circuit. Circuit breakers weaken over time too especially if they have more than they are. rated for plugged into the same circuit. And your circuit may be doing its job by detecting an excessive draw of power when the refrigerator is plugged in. You must have someone that knows electricity to inspect your refrigerator for shorting and the circuit it is plugged to for correct wiring for every ones safety. Thanks, Sea Breeze

Apr 25, 2010 | Fisher and Paykel RF201ADUX Bottom Freezer...

2 Answers

RV Air Conditioner Keeps Tripping Circuit Breaker & Compressor


It sounds like the unit was miswired at the factory, since when the A/C is "off" at the thermostat, there should be no calls for cooling or for the fan to run.

You also stated the most puzzling issue, with the breaker turned "off" the same thing happens. This shouldn't happen at all, when the power breaker is turned off, there should be no power being supplied to the unit and it shouldn't be able to do anything. Very strange indeed, but likely a major error done when the RV was manufactured, or some wiring in the loom has somehow become shorted and is supplying power from another breaker/source.

I think a call to the manufacturer is in order since there is no easy solution aside from possibly rewiring the A/C circuit.

Not sure when your RV was made, but definately time to call the manufacturer and break out the wiring schematic in an attempt to isolate and resolve the problem.

Hope you find this helpful and best regards!

Aug 06, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Breaker trips when running a small dehumidifier alone on circuit


the breaker is getting weak and won't hold the load, assuming that nothing else is on the line. if it trips immediately u could have a short.

Jul 11, 2009 | Cutler Hammer BR120AF BREAKER CIRCUIT BR 1...

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

1 Answer

Carrier A/C in RV won't run


check your breakers make sure when running unit this is the only thing on the breaker 15 to 20 amp be sure to keep a window cracked as well unit does freeze over so don't have all the way on cold

Jun 23, 2009 | Dometic Rooftop RV Air Conditioner

4 Answers

NO POWER, POPPED CIRCUIT


Two possible causes.

First (and most likely) the circuit is being overloaded. This kitchen circuit may be shared with another appliance (like the refrigerator) which is drawing enough power when both are running to trip the breaker. A Typical kitchen circuit is 20 amp with #12 wiring. So an 1800 watt microwave might draw 13 or 14 amps while a fridge compressor kicking in can surpass 7 amps before it levels off. If this is an older home the kitchen may have a 15 amp circuit with #14 wiring. If the circuit is a 20 amp you will have to split the appliances onto separate circuits. (Under code a kitchen must have a minimum of 2 separate appliance circuits). If it is a 15 amp you might be able to split them as well or may be looking up upgrading the breaker and the wiring from 15amp #14 to 20 amp #12 (but you could still have the same problem).

The other possibility is a short or loose connection. If splitting appliances onto their own circuits doesn't fix this you would probably want an electrician to come in and check for other underlying causes which could represent a fire hazard.

Hope this helps.

Apr 01, 2008 | Whirlpool GH6177XP Microwave Oven

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