air condition

Are you sure it’s not just the fan? Our AC compressor cycles, but the fan runs continuously. If on high, you can barely hear the difference.
We have the basic Dometic 13.5k BTU unit.

Your situation is one of two things:

1. Compressor cycles on / off and the blower fan continues to run, which is normal operation for most units that have controls at the ceiling.

2. The ambient temp in your RV is still warm enough that the A/C is not keeping up with the cooling. (normal operation)

Some wall mounted thermostats that control a roof A/C have a Fan Hi / Low setting and a Fan Auto Hi / Auto LOW setting.

On the AUTO setting, the fan will turn off when there is no more demand for cooling.

TO give a better answer to your qiuestion, we need to know more detals to your set-up:
What brand / make / model A/C do yo have
Where is it controlled (at the ceiling panel or via a wall t-stat
If it's controlled by a wall T-stat, post a photo of it.

Normal to run near continuous in hot conditions. Most will cycle a few times just before sunrise.
If the RV is cool you are doing better than most.

My fan runs constantly but that is standard for the unit. I am figuring out a way to put a 110 volt plug in thermostat near the breaker panel. The one I am looking at has a remote temperature control, I do not know how good it is but here is the link to it.
https://smile.amazon.com/gp/product/B071NG8MZK/ref=ox_sc_saved_image_2?smid=A3KNQ5UR6RZMP9&psc=1
THE THERMOSTAT I SENT THE LINK TO WILL NOT WORK. IT IS ONLY 15 AMP AND MOST CAMPER AC'S ARE 20 AMP

merwood wrote:
My air cools good but will not cycle on and off runs all the time. Any help would be welcome . Thanks

Since this is in travel trailer section you probably have a wall thermostat. See if it has an AUTO fan setting. If it does the fan will cycle on and off. If you set the fan on high or low the compressor will cycle but the fan will run continuously.
My bet is the thermostat is set on high.

edd210 wrote:
My fan runs constantly but that is standard for the unit. I am figuring out a way to put a 110 volt plug in thermostat near the breaker panel. The one I am looking at has a remote temperature control, I do not know how good it is but here is the link to it.
https://smile.amazon.com/gp/product/B071NG8MZK/ref=ox_sc_saved_image_2?smid=A3KNQ5UR6RZMP9&psc=1
THE THERMOSTAT I SENT THE LINK TO WILL NOT WORK. IT IS ONLY 15 AMP AND MOST CAMPER AC'S ARE 20 AMP

The fan runs continuous on non-thermostat models partially to reduce the chance of freezing up.

Thanks for your replies. 6.2Superduty was correct on high setting. works great thanks

Your thermostat control inside the air conditioner may be set too low. In a Dometic Brisk Air, the thermostat has a tiny screw close to the rheostat to adjust to the temp you want it to stop cooling at. You have to take the air conditioner parts inside completely apart to get to it. Take the inside panel off, thermostat housing off, lid off the housing to get to the temp control. There are tiny letters and an arrow above the screw pointing to the direction that makes it run and cool longer. I drilled a 1/4" hole in the lid holding the thermostat in, right over where the screw is, then drilled another hole thru the plastic control knob, so now I can stick a tiny screwdriver thru the two holes and make the adjustment without taking it all apart. My conditioner would run for about 2 minutes then stop cooling, then start, then stop. It was set way too high of a temp so wouldn't keep cooling. Then my motor starter capacitor shorted out, but a new one fixed it.

You most likely have it set to fan at the thermostat. Set it to Auto. I made the same mistake.

Edit: Whoopps - didn't see that you resolved. Awesome!