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07-06-2020, 05:32 PM
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#1
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Established Member
Join Date: Jul 2017
Location: Phoenix
Posts: 46
M.O.C. #20155
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AC Tripp’s Breaker
Hi all , sure is hot here. We have a 2018 3791RD, full time, in Arizona right now and cannot head to cooler country right now. Right now 106 outside. The living room ac tripped the breaker. Reset breaker and tripped again in about a hour. Good voltage on line. I checked for loose wires in breaker box, all tight. Changed breaker. AC ran about an hour and tripped breaker again. Breaker feels hotter then bedroom ac breaker before it trips. Mobile RV repair we use cannot get to us until next Monday. Bedroom AC does not begin to cool living room. Any suggestions for something else I can check. Beside price of local hotel!!! Did I say it was hot???
Thanks, Art
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Art & Ann
2018 3791RD
2017 F350 PSD Super Cab LB SWD
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07-06-2020, 06:15 PM
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#2
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Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
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are you running it on High or Auto?
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Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
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07-06-2020, 06:32 PM
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#3
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Established Member
Join Date: Jul 2017
Location: Phoenix
Posts: 46
M.O.C. #20155
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Auto mode
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Art & Ann
2018 3791RD
2017 F350 PSD Super Cab LB SWD
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07-06-2020, 07:06 PM
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#4
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Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
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try running it on High
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Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
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07-06-2020, 07:21 PM
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#5
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Montana Master
Join Date: Dec 2017
Location: Mountain Home
Posts: 839
M.O.C. #20949
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Couple of things I’d check are...
Get up on roof and clean out condenser
Check fan ... with power off to see if it spins easily
Stay on roof and run the air conditioner
If you hear a humming sound replace start capacitor
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07-06-2020, 07:52 PM
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#6
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Established Member
Join Date: Jul 2017
Location: Phoenix
Posts: 46
M.O.C. #20155
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Good thoughts, I will get up on the roof early tomorrow before everything gets too hot to touch.
Jeffba, I tried all fan modes, all tripped breaker. Will run about an hour or so then trip.
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Art & Ann
2018 3791RD
2017 F350 PSD Super Cab LB SWD
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07-06-2020, 08:28 PM
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#7
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Also, make sure your return air filters are clean and the ducts are not collapsed.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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07-06-2020, 08:52 PM
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#8
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Established Member
Join Date: Jul 2017
Location: Phoenix
Posts: 46
M.O.C. #20155
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DQDick, thanks. Return ducts are open, good air return and filters are clean. Every other fin trimmed off output ducts. AC starts quickly and blows cold air. When both ACs worked inside temp would be 85 with outside temp around 105. This problem just started yesterday. Living room AC will run for an hour or so then breaker will trip.
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Art & Ann
2018 3791RD
2017 F350 PSD Super Cab LB SWD
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07-07-2020, 06:02 AM
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#9
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,707
M.O.C. #7992
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I see you tightened all wires at breaker panel. Check your wire connections for tightness at the unit itself. Wire nuts can come loose.
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2006 3000RK
2009 Ram 2500
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07-07-2020, 08:09 AM
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#10
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,169
M.O.C. #6433
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It is also possible you simply have a breaker getting weak. I had one on my rear A/C that started tripping under similar conditions (hot weather and trip after running for 30-60 minutes) for no apparent reason. And it was only 2-3 years old. Replaced the breaker and never tripped again. Simple and inexpensive something try.
Oops. Overlooked the fact you already changed the breaker.
Two or more breakers positioned side by side and each running warm/hot can share heat and cause a breaker to trip at a point lower than its rating.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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07-07-2020, 10:29 AM
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#11
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Montana Fan
Join Date: Jul 2015
Location: Edgerton
Posts: 218
M.O.C. #17678
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You say the voltage is good. What is the voltage on each line with both A/C units running? Are both units wired to the same leg of power, or are they on opposite legs? Our 2015 High Country had both A/C units wired on the same leg. That was one of the first things I changed. Our 2019 Montana has them wired on opposite legs.
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07-07-2020, 10:50 AM
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#12
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,707
M.O.C. #7992
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Quote:
Originally Posted by Tom N OH
You say the voltage is good. What is the voltage on each line with both A/C units running? Are both units wired to the same leg of power, or are they on opposite legs? Our 2015 High Country had both A/C units wired on the same leg. That was one of the first things I changed. Our 2019 Montana has them wired on opposite legs.
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Tom, You make a good point. That is exactly how my 2006 was wired. Took about 5 minutes to change it. Balanced the load nicely.
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2006 3000RK
2009 Ram 2500
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07-07-2020, 02:52 PM
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#13
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,169
M.O.C. #6433
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Both A/Cs on the same leg gives the impression of unbalance and needs to be looked at. But it is not quite that simple. If both A/Cs are on leg 1, and the water heater, microwave, converter, and that outlet your wife plugs her 1500 watt hair dryer or you plug in your 1500 watt space heater are on leg 2, then it is not as unbalanced as first appears. In a case like that, if you move an A/C to the leg 2, then you may need to move something else from leg 2 to leg 1. You need to look at the overall picture.
Two A/Cs are less than 30 amps, which only a little over half the 50 amp leg.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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07-07-2020, 03:55 PM
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#14
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Established Member
Join Date: Jul 2017
Location: Phoenix
Posts: 46
M.O.C. #20155
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Update: Mobile RV tech just left. Said compressor was bad. Was drawing 20.2 amps and thus tripping breaker.
Bad news is that he checked on line inventory across the country and said none were available. Dometic plants closed. He put a back order in. Could be quite a while for a new air conditioner to become available. And it is 106 today.
Thanks to all that replied. For those who talked about the ACs on same line, ours are on separate legs.
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07-07-2020, 04:05 PM
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#15
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Established Member
Join Date: Aug 2018
Location: Erda
Posts: 27
M.O.C. #22493
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I am an HVAC mechanic. It is very rare for a compressor that is bad to run at all. I would replace the capacitor as that could be the cause of the compressor pulling higher than normal current. Also make sure that your condenser is clean ( coil on the roof that is visible from the outside) when condensers get dirty the current will rise due to higher operating pressures. Take a hose to the roof and wash the coil thoroughly with power disconnected. If you replace the capacitor be careful to pay attention to the mfd and vac ratings and get the exact replacement they are not one size fits all. Hope this helps.
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2019 F350 DRW Crew Cab 4x4, 2018 Montana 3820fk, 300 watts solar, 3000 watt true sine inverter.
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