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Old 05-06-2012, 06:12 AM   #1
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20 amp Breaker Trips when HOT

Symptom: AC will start when 90-deg outside after all day pulling. Within 3-5 mins. the 20a breaker for the AC trips off.

Conundrum: Only happens when it's HOT inside, when you *really need* AC. Runs and runs when it's 70 deg. outside.

Attempted:
1 - Replaced dual 20a breaker with a new one - no joy.
2 - Sanded all connections brite and reconnected - no joy.
3 - Moved AC breaker from left position to right position, trying to keep it cooler - no joy.
4 - Removed, cleaned, replaced AC filter elements inside - no joy.
5 - Left AC filter elements off inside - no joy.

Question: Could a MOD point me to the thread in which someone has solved this problem in the past? And/Or any suggestions for anyone?

I could stop at Out Of Doors Mart Monday to get parts or have service done if all else fails. THANKS!
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Old 05-06-2012, 06:35 AM   #2
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If you had a clamp-on amp meter (not a common tool) you could see how many amps are being pulled by the circuit. If it is close to 20 then it is going to heat up and trip, which is overload condition vs. direct short with trips immediately. Freon issues would cause the internal overload to trip but not the breaker. The air conditioner should be the only thing on that circuit.
Good luck,
Pat
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Old 05-06-2012, 07:26 AM   #3
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One thing to consider, when it's only 70 degrees outside, the air conditioner compressor may not even be running; it may just be circulating ambient air. Assuming of course you've got it set so that the fan blows air all the time.

Try this… Crank the thermostat as high as it will go, so that you know that the AC is only blowing ambient air. Then lower the thermostat a couple of degrees at a time until the compressor kicks on to start cycling freon. If the breaker trips then, you've isolated the problem. And if that doesn't cause the breaker to trip, you've eliminated a possible cause.
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Old 05-06-2012, 07:56 AM   #4
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You might PM Lewster, he is very helpful and is a certified RV tech.
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Old 05-08-2012, 04:53 PM   #5
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END OF STORY. kokopat mentions a clamp-on meter. That's what the tech used at Out Of Doors Mart to determine the compressor was drawing over 16 amps by itself. It was at the end of its useful life. They replaced the full AC unit. Now it runs much quieter and draws only about 7-8 amps under load. Nice solution. Nice and cool inside. AND, they did all this for me without an appointment, fitting me into their shop schedule because I was on the road home. Also Nice!
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Old 05-08-2012, 05:19 PM   #6
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Another HIGH 5 to Out of Doors Mart! Glad you are fixed up, and on the road, coolin' it.
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Old 07-05-2012, 01:07 PM   #7
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This same problem is happening to me in the 90's but ran fine last night with temps in the 80's. Anyone know a mobile RV service in Cincinnati, Ohio?
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