Question about Dometic Rooftop RV Air Conditioner

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When we turn the AC on, after a couple of minutes we hear a hum which lasts about a 1.5 minutes then shuts off. No fan air movement or cooling detected. The unit is 5 years old. We RARELY use it and when we do need it, it doesn't work. We've had it repaired once. Do we have to get it serviced each time we use it? Help! Linda

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Go up on roof and using a stick or similar, poke it through the air holes in side & try to turn the fan blade at rear of the air conditioner. Make sure it's off at the time. Try to get 2 or 3 complete revolutions of the fan blades, then try turning it on fan only first,and let it run on fan for a few minutes, then switch to cool. If worse comes to worse and you can't get blades to turn, remove cover on roof (watch for wasps & bees) and spin fan blades a few times by hand, step back & have someone try fan only. If that works, then try cool. Sometimes they get a dead spot from sitting, and that will get it going again, 90% of the time. Let me know how it goes.

Posted on Jul 29, 2009

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