We have a 2009 Mandalay 43A with three rooftop air conditioners. While at the Colorado River a few weeks ago with outside temperatures exceeding 110 degrees, the air conditioners started tripping their individual breakers. I could reset the breakers, but within twenty minutes or so they'd trip again. Eventually, one of the air conditioners stopped working altogether until very late at night.Each air conditioner is pulling around 14 amps (I checked). Here's the kicker: This happens while plugged into 50-amp service at the campground as well as running on the 10,000-watt Onan diesel generator.The RV tech is telling me "... it's just too hot." Well, shoot, I guess I shouldn't run the air conditioners when it's hot?!Do you have any thoughts?Pat in Menifee, CA

If you have not clean the unit in the past few month, its time. Were you on high cool or low cool with the fan. Freezing up to also cause this, but I would check the unit.

When the one quit working did the other two perform as they should?

PCarnathan wrote:We have a 2009 Mandalay 43A with three rooftop air conditioners. While at the Colorado River a few weeks ago with outside temperatures exceeding 110 degrees, the air conditioners started tripping their individual breakers. I could reset the breakers, but within twenty minutes or so they'd trip again. Eventually, one of the air conditioners stopped working altogether until very late at night.Each air conditioner is pulling around 14 amps (I checked). Here's the kicker: This happens while plugged into 50-amp service at the campground as well as running on the 10,000-watt Onan diesel generator.The RV tech is telling me "... it's just too hot." Well, shoot, I guess I shouldn't run the air conditioners when it's hot?!Do you have any thoughts?Pat in Menifee, CAI assume the breaker is hot to the touch, when it trips?What's the voltage, with all three running?If you're good, then try leaving your breaker box door open, for getting some air.

My old 2001 42 foot Foretravel had three AC units and would run fine at those temps all the time on either shore power or the generator. I never had one blow a breaker. Now getting the coach cool was harder and they ran all the time and I had the fan on high all the time but we got it down into the 70s and kept it there all day when the temps were 100 plus

John S. wrote:My old 2001 42 foot Foretravel had three AC units and would run fine at those temps all the time on either shore power or the generator. I never had one blow a breaker. Now getting the coach cool was harder and they ran all the time and I had the fan on high all the time but we got it down into the 70s and kept it there all day when the temps were 100 plusLots and lots of mediocre with my Discovery, but the one thing that is OUTSTANDING is the 3x 15,000 A/Cs on the top. In the southeast or the northwest.....Texas or Utah......cold. Freezing cold.If it is the genny and shore 50 amp, there is an issue with your power commander, I would bet. The load is just too much for some component in the system.W

Air Conditioners and Really Hot Weather | Good Sam Community

John_S_
Explorer II
Jul 29, 2018
My old 2001 42 foot Foretravel had three AC units and would run fine at those temps all the time on either shore power or the generator. I never had one blow a breaker. Now getting the coach cool was harder and they ran all the time and I had the fan on high all the time but we got it down into the 70s and kept it there all day when the temps were 100 plus
tropical36
Explorer
Jul 29, 2018
PCarnathan wrote:
We have a 2009 Mandalay 43A with three rooftop air conditioners. While at the Colorado River a few weeks ago with outside temperatures exceeding 110 degrees, the air conditioners started tripping their individual breakers. I could reset the breakers, but within twenty minutes or so they'd trip again. Eventually, one of the air conditioners stopped working altogether until very late at night.

Each air conditioner is pulling around 14 amps (I checked). Here's the kicker: This happens while plugged into 50-amp service at the campground as well as running on the 10,000-watt Onan diesel generator.

The RV tech is telling me "... it's just too hot." Well, shoot, I guess I shouldn't run the air conditioners when it's hot?!

Do you have any thoughts?

Pat in Menifee, CA

I assume the breaker is hot to the touch, when it trips?
What's the voltage, with all three running?
If you're good, then try leaving your breaker box door open, for getting some air.
Weldon
Explorer
Jul 29, 2018
When the one quit working did the other two perform as they should?
MountainAir05
Explorer II
Jul 29, 2018
If you have not clean the unit in the past few month, its time. Were you on high cool or low cool with the fan. Freezing up to also cause this, but I would check the unit.

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