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Old 07-15-2014, 11:00 AM   #1
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Main A/C

Today at noon I realized that my main A/C was just humming and not blowing anything. I checked the thermostat and it was set to "low on" instead of "low auto" where I usually keep it. Probably the doings of my 3yo. So I switch it back to "low auto" and still just a hum. So I turned it off for a few minutes and even reset the breakers and still just a hum. But if I switch it to "auto high" then it works. Any ideas?
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Old 07-15-2014, 11:07 AM   #2
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Also, the fan setting alone works on low and high.
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Old 07-15-2014, 02:37 PM   #3
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Check the voltage coming into the TT. Most things in the TT can work on a varying amount of voltage but not the AC.
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Old 07-15-2014, 02:45 PM   #4
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http://youtu.be/_s5yrxALasw

Not sure what is wrong with your AC but checking the voltage coming in is a good start.
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Old 07-15-2014, 03:31 PM   #5
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Low voltage coming into the RV plus too much voltage drop caused by the compressor. A few drops of oil on the blower shaft may help, mine tends to stick if the A/C hasn't been run in a few months, so rotating it by hand and a few drops of oil and it is good for another summer season.
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Old 07-16-2014, 07:16 AM   #6
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X3 on the low voltage. Been there. I keep a voltage monitor onboard. The shop where I bought my first trailer strongly recommended it after we had the A/C in for service subsequent to a series of brown-outs we had a local campground.

Apparently the new A/C units have built in protection now for power drops, but never investigated if the compressor can still be damaged from low voltage.

Our trailer is wired for second A/C, so we're running a 50 amp circuit and it appears that we have less issues running 50 vs. 30 at the mom and pop campgrounds.

While I've seen different numbers posted to various rv sites, I usually kill the A/C if I drop below 108v.

Great investment. Also monitor for other issues such as open ground, open neutral, and polarity issues. You can get it here at Amazon.

http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
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