Ac turning off

[Kenny kustom]

This week, my ac has been shutting off. The fan stops.
If I cycle it off, then back on.. it cuts back in. Runs for a bit, then off.

If I leave it after it shuts down, it will come back on, after about an hour or so.

Any ideas??


2016 Sabre 36QBOK
2015 Ram 3500 CUMMINS

[Flybob]

What is the voltage ?

[Kenny kustom]

Originally Posted by Flybob

What is the voltage ?

116 ish.

I'm home now, and plugged into 30 amp on the side of my house.
119v. Still doing it.


2016 Sabre 36QBOK
2015 Ram 3500 CUMMINS

[Bama Rambler]

What brand of A/C do you have?

[Kenny kustom]

Dometic.

I'm doing yard work today, I've left it on, and it's shutting off and turning on by itself.


2016 Sabre 36QBOK
2015 Ram 3500 CUMMINS

[AGFazio]

What temp is set? It will shut off if fan is in auto and it reaches temp set on stat.

[Kenny kustom]

Originally Posted by AGFazio

What temp is set? It will shut off if fan is in auto and it reaches temp set on stat.

It's set really low.
The fan has never shut off before, just cycled the compressor.



2016 Sabre 36QBOK
2015 Ram 3500 CUMMINS

[Witch Doctor]

Originally Posted by Kenny kustom

It's set really low.
The fan has never shut off before, just cycled the compressor.



2016 Sabre 36QBOK
2015 Ram 3500 CUMMINS

What you have is described is if your fan is set to on, then only the compressor will cycle. in auto mode the fan should cycle with the compressor. Do I understand you correctly Kenny? Also if your sensor in the fin is not set correctly you could be freezing up then when it thaws it comes back on. You could be getting a false reading. Dometic has those both pronounced problems to start with.

[5picker]

Does it seem to be cooling?
Is it satisfying the t/stat?

[Kenny kustom]

I performed a " master reset " as per the dealer.

It seems to be operating correctly now!!

I went through, and can activate the functions individually as per the diag mode.





2016 Sabre 36QBOK
2015 Ram 3500 CUMMINS

[Kenny kustom]

Originally Posted by Witch Doctor

What you have is described is if your fan is set to on, then only the compressor will cycle. in auto mode the fan should cycle with the compressor. Do I understand you correctly Kenny? Also if your sensor in the fin is not set correctly you could be freezing up then when it thaws it comes back on. You could be getting a false reading. Dometic has those both pronounced problems to start with.

I was getting quite a bit of condensation on the unit last week.

When it did shut down, I could cycle it back on with the t stat.


2016 Sabre 36QBOK
2015 Ram 3500 CUMMINS

[head gamez]

Originally Posted by Witch Doctor

What you have is described is if your fan is set to on, then only the compressor will cycle. in auto mode the fan should cycle with the compressor. Do I understand you correctly Kenny? Also if your sensor in the fin is not set correctly you could be freezing up then when it thaws it comes back on. You could be getting a false reading. Dometic has those both pronounced problems to start with.

Can you elaborate more on this? Mine shut down the last time out and the thermostat read 32* when you pressed the inside temperature button. I ran the fan for about 20 minutes and then it came back on. Curious what you mean by the sensor in the fin.

Thanks


2016 Sandpiper 376BHOK
2500HD Chevrolet

Sent from my iPhone using Forest River Forums

[Witch Doctor]

Originally Posted by head gamez

Can you elaborate more on this? Mine shut down the last time out and the thermostat read 32* when you pressed the inside temperature button. I ran the fan for about 20 minutes and then it came back on. Curious what you mean by the sensor in the fin.

Thanks


2016 Sandpiper 376BHOK
2500HD Chevrolet

Sent from my iPhone using Forest River Forums

Dometic has a sensor on a wire that is between your fins on the evaporator side. If it senses that the coil is froze up like a block of ice you can't get air flow through it. So the unit shuts down until it defrosts. Then it will start again, the sensor will fall out or give you false readings you need to push it back in the finnes again. It could be out of place and shutting you down even if the coil is not frozen up. Pull your R/A grill off and look up in there, That sensor will go off for being out of placement, and other things if it is set in the right position, things that make a coil freeze are low on freon and dirty air filters. It will also freeze if the outside temp at night is to low and your TT is set to low and you do not have enough heat transfer. (low temp inside and low temp outside.) Your unit can work great at 80 degrees outside being low on freon but you will notice it when the hotter it gets outside, once it starts to freeze you can't stop it until you turn the unit off and just run the fan to help defrost the coil, you will have alot of condensation at that point, that's just the coil defrosting..

[head gamez]

Thanks. I understand the freezing up part and low on freon. I fight it with my leaking coil at home once a year. As long as I still have some in the tank and a means to re-fill it, I'm not replacing it. Too cheap. Once the tank I have is empty, we will look at other options. Although I did put some stop leak material in this year.

I do not have an access panel inside, only two air returns and vents. I'll have to pull the cover off the unit up top (and maybe remove the unit) to check the sensor. I'm going to be doing it anyway to check that the duct work is properly connected.

Thanks for the help.


2016 Sandpiper 376BHOK
2500HD Chevrolet

Sent from my iPhone using Forest River Forums

[VinceU]

There's a freeze sensor embedded in the evap cooler section of the outside unit of the a/c. It's with a fan under a molded cover. Purpose to prevent sub cooing and freeze up of the circ inside air. Often found loose and dangling.