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Old 06-07-2017, 06:40 PM   #1
rcmike
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A/c compresser not coming on but blows air

1 thermostat controls all 3 a/c units on trailer, bedroom and garage get nice cold air and you can go on top and hear compressor running on them, living room a/c blows air but not cold and compressor is not coming on. only 2 a/c units run at a time on coach per the way keystone wiring up the raptor 5th wheel TH line. I've replaced the a/c unit up top with another new unit and the thermostat and still have the same problem. a/c units are all 15k coleman units. zone 1 is living, zone 2 is front bedroom, zone 3 is garage. Does this sound like a ground or bad board that is actually up in the duct of each a/c unit. Just looking for some ideas on what may be the problem. Ill take to dealer at the end of summer because its liveable in the coach right now. Its just I don't want to lose the trailer for probably 3 to 5 weeks due to dealer backlog. yes ive already asked them probably how long they would have it. I got the extended warranty but just don't want to give it up with summer coming. I would just like the humming noise back on zone 1 a/c unit,,lol
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Old 06-08-2017, 03:48 AM   #2
ctbruce
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Does it ever come on? My understanding is that the power management system will rotate between the three and keep 2 on at a time. My Impact has 2 separate thermostats so I can control them both. Bummer. Maybe the control board is bad?

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Old 06-08-2017, 04:06 AM   #3
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Turn on only that zone and walk away for a half hour or so. I thought the same thing, but it took a long while for the management system to switch it on.
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Old 06-08-2017, 05:52 PM   #4
rcmike
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Turn on only that zone and walk away for a half hour or so. I thought the same thing, but it took a long while for the management system to switch it on.
tried that and was not the fix. By leaving it running ,zone 2, it actually makes the living area hotter .
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Old 06-08-2017, 05:54 PM   #5
rcmike
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Originally Posted by ctbruce View Post
Does it ever come on? My understanding is that the power management system will rotate between the three and keep 2 on at a time. My Impact has 2 separate thermostats so I can control them both. Bummer. Maybe the control board is bad?

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The a/c unit comes on, yes, but the compressor inside the a/c unit never comes on. thx
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Old 06-25-2017, 05:58 PM   #6
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After some checking on things and taking the cowling off the inside of the 3 Ac units in TH.....We could not figure out why the living room unit had the thermostat wires on freeze and the freeze sensor that's stuck in the coils was plugged into thermostat . so after all the volt
Testing and going back and forth on unit . we switched the wires and guess what,,,,, its blowing the coldest air this side of Canada. What a learning experience,and you could say I got more familiar with my trailer .... In hind site,,, how did this make it out of qc checks at keystone? Its all good to me, in still very happy with the unit and the stuff I've done to it....but I do now have a extra 15k a/c unit, new thermostat , and new control box,,,, roflmfao 😄

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Old 06-25-2017, 06:46 PM   #7
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Believe me when I say QC isn't just a Keystone factory issue. I don't think they plug in every unit and actually test AC output, not enough time.

Over the years, I have seen some things come in from the factory that makes you wonder if the QC people even looked at the unit.

Last week had a TSB for a Class A that involved switching two breakers so the three A/C units wouldn't draw off the same "side" of a 50A panel. Well as luck would have it, one of the AC load wires wasn't ever put into the breaker slot and tightened down.
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