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Old 07-02-2022, 02:51 PM   #1
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AC Breaker keeps tripping

Has anybody else experienced this problem? My 2012 30 Amp Jayco Melbourne 29D motorhome keeps tripping the AC breaker, no other major or minor appliance being on at the same time. Is currently 101 degrees outside, 82 degrees inside. Why does it trip?
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Old 07-02-2022, 02:54 PM   #2
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breakers do go bad, a/c could also have high head pressure causing an overdraw.
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Old 07-02-2022, 02:57 PM   #3
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What's the amp rating of the AC breaker?
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Old 07-02-2022, 03:08 PM   #4
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You should check and see what your voltage is, if it is low that could cause the breaker to trip, and keep in mind low voltage could damage an A/C. ~CA
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Old 07-02-2022, 04:18 PM   #5
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How you diagnose high head pressure?
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Old 07-02-2022, 04:20 PM   #6
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Good question! I would have to check…..
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Old 07-02-2022, 04:23 PM   #7
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I am afraid I would have to take it in for a check up.. Thanks
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Old 07-02-2022, 08:03 PM   #8
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Can you clarify what breaker is tripping. You say 30 amp AC breaker is tripping. AC as in Air Conditioner, or Alternating Current? I suspect the main 30 amp breaker for the MH and not the AC unit.

Breakers do go bad. But low voltage, increases the amp load, hence it could trip prematurely.
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Old 07-03-2022, 08:22 AM   #9
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The Air Conditioner breaker is the one tripping. Is one of four breakers in the motor home. The motor home has a 30 Amp plug in connection, don’t know what is the actual amps of the breaker. In the past if I used the microwave at the same time the air condition was running the air conditioner breaker would trip so I would have to first turn off the AC before using the microwave. Now the same breaker is tripping without using any othe major or minor appliances. Hope this clarifies the problem. What causes a “low voltage” condition?
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Old 07-03-2022, 08:31 AM   #10
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A common reason for low voltage is that there is a high load on the electrical system. In other words if there are a lot of RV's running their A/C(s), that could cause the voltage to be lower than otherwise for the entire RV Park's electrical system.

Do you have a voltage meter? That is needed to know if the voltage is low.

BTW, just a double check thought to make sure the water heater isn't turned on for electric heating. ~CA
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Old 07-03-2022, 10:30 AM   #11
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What year and model camper do you have?

The 30 amp breaker is your main. Not the air-conditioner. Your 4 breakers are tied back to the main, so you cannot pull more than 30 amps in total. So if the main trips, all 120 volt ac power is shut off.

Main: 30 amps, protects from pulling to much power from the accumulation all all the loads below. You may not have all the items below.
  • Air conditioner: 20 amp
  • Microwave: 20 amps
  • Water heater: 15 amps
  • General outlets: 15 amps
  • Converter: 15 amps

If your main is tripping, for no reason, check for low voltage. If that is not the cause, then the breaker could be getting weak. This does happen. It just needs to be replaced.

I recommend labeling all your breakers, so you know which breaker is for what.

With only 4 breakers in total. I suspect you do not have an electric heating unit on your water heater.

Here is a sample of my breaker box labeled

Click image for larger version

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Old 07-03-2022, 10:57 AM   #12
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This is very helpful. I just checked my breaker box, it is a 6 not 4 breaker box and the one that trips is labeled as 30 amp. I did have the water heater on “electric” instead of LP not knowing the huge draw on amps. I was trying to save LP. The motor home is a 2012 Jayco Melbourne 29D Class C
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Old 07-03-2022, 11:01 AM   #13
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You were right. The water heater was turned on for electric heating instead of LP. Hope it helps. Thanks much for the tips!
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Old 07-03-2022, 12:46 PM   #14
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Originally Posted by Hill Country Camper View Post
You were right. The water heater was turned on for electric heating instead of LP. Hope it helps. Thanks much for the tips!
I suspect the water heater and the A/C both being on at the same time is the reason the main breaker is tripping and that is not uncommon. Stay cool and let us know if the breaker stays on now. ~CA
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Old 07-11-2022, 02:22 PM   #15
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Originally Posted by Hill Country Camper View Post
How you diagnose high head pressure?
I had the same problem but a quick look at my EMS showed over amperage on my 30 that was caused by electric water heater and a/c running at the same time.
The EMS also showed voltage was normal.
All that without a meter although I do have one.
Curious what Grumpy's response is to diagnosing high head pressure!
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Old 07-11-2022, 04:30 PM   #16
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I am not sure my motorhome has a EMS system to check the amps. What exactly is and where would it be? My RV is a 2012 Jayco Melbourne 29 D
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Old 07-11-2022, 04:58 PM   #17
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The EMS is a separate component you buy. Not a factory installed accessory. Hughs and Progressive Industries are just two companies that make good EMS's. They're better than a regular surge protector.
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Old 07-11-2022, 06:27 PM   #18
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Oh, good to know. Thanks much, appreciate the info.
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Old 07-11-2022, 07:24 PM   #19
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I noticed there are two types of EMS; Portable or hardwire. Any insight as to which one is best, the price is about the same.
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Old 07-12-2022, 03:54 AM   #20
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Originally Posted by Hill Country Camper View Post
I noticed there are two types of EMS; Portable or hardwire. Any insight as to which one is best, the price is about the same.
There is a thread (or two) that discusses this. There are pros and cons to both listed in these threads.
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