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Good Sam ESP

My RV's Roof Top Air Conditioner Continually Cycles on and Off

by Anonymous
()

Stopping Your RV's A/C from Rapidly Cycling On and Off

Stopping Your RV's A/C from Rapidly Cycling On and Off

Editor's Note: This question is in reference to a 1998 Nomad Fifth Wheel.

The air conditioner cuts on, really cools, cuts off then immediately cuts back on continuously. The only way to stop it is to turn it completely off. What causes this to happen and can I fix it or do I need a technician to come out.

ANSWER: Hi, there are several conditions that could be causing the problem you are experiencing with the rooftop air conditioner in your RV. Listed below are the most common causes.

Bad Thermostat: I am assuming that you have your RV's AC Thermostat set to Automatic. If the thermostat is not properly functioning it could cause the Air Conditioner to cycle on and off.

Failing Control Board: a bad Control Board in the air conditioner unit itself can also cause the symptoms that you are experiencing.

Both of the items mentioned above would have to be checked out by a Certified RV Technician in order to determine what needs to be replaced or repaired.


Inside AC evaporator coil freezing up: I am thinking that this one is the most likely candidate especially if this problem is occurring at night or on humid days. When the AC Evaporator Coil Freezes up the AC unit will start to cycle on and off just like what you are experiencing.

Once the coils are frozen the only way to unfreeze them is to either leave the AC unit off or to run the AC in "Fan Only" mode until the coils unfreeze.

To prevent this from happening again you may have to run your air conditioner at a higher temperature.

Another way you can help to prevent this from happening again is by making sure
that your Air Conditioner has a clean filter and that there is no dirt or debris on the Evaporator Coil as that dirt can also cause the evaporator coil to freeze up. Follow the two steps outlined below.

1. Clean the AC filters. Dirty AC filters can reduce the cooling capacity and efficiency of your Air Conditioner/s. The filters for RV Roof air conditioners are located inside the RV under the air distribution bezel on the AC unit.

Most RV Air Conditioner filters are made of washable materials and should be washed in warm water carefully and thoroughly. Let them air dry before you replace them. If the filter is torn or will not clean up you should replace the RV Air Conditioner Filter. You should check and clean these filters at least once a month.


2. Once the filter/s is removed on most RV Air Conditioning units you will be able to see the evaporator coils. Get a flashlight and look at those coils to see if there is any type of accumulation of dirt or debris present, if there is use a very soft bristle vacuum attachment to carefully remove the dust and dirt.

Once you have done the cleaning as outlined above try running the AC again and see if this has resolved the problem. If it does not, then you will need to get a Certified RV Technician to take a look at your air conditioner to find the exact cause of the problem.

Hope this helps.

Do you have any suggestions or comments on this topic? You can add them to this page by clicking on the "Click Here To Post Comments" link located near the bottom of this page.

Happy RVing

RVing Al

Comments for My RV's Roof Top Air Conditioner Continually Cycles on and Off

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Rating
starstarstarstarstar 		AC kicks on. Then off and attempts on
by: Clay

Turn on AC and it comes on and runs a few minutes Blowing then goes off and after It is off about a minute it’s like it tries to kick back on like a compressor or something kicks on and draws a heavy load of power for a second but it doesn’t start blowing and then about a minute later does the same thing. I turned it off and checked all wiring and breakers Any idea I have a tech looking at it this week but want to know if it’s simple fix and not a replacement of something high dollar.
Rating
starstarstarstarstar 		Roof ac
by: Anonymous

My ac was cooling great and not freezing up. Would cool down, go off then right back on. I changed the thermostat and controll board. Still cooling down, turning off then tight back on. What else could cause this?
Rating
starstarstarstarstar 		Esther's problem?
by: TerryH

Esther's comment not dated, but also not clear" DID her UNIT have the same symptom/s BEFORE the NEW THERMOSTAT/ NEW CONTROL BOARD??
Rating
starstarstarstarstar 		Ac
by: Esther

Just had new thermostat and board put in and this happens most of time in the morning after it heats up outside. Also filter is clean.

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