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Old 05-30-2016, 11:34 PM   #11
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High temp and high humidity, run fan on high. The unit will work a lot more efficiently and not ice up. At night when the temp drops turn the fan back to auto. This was a recommendation by a Dometic A/C factory rep.
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Old 05-31-2016, 08:32 AM   #12
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Originally Posted by andymil View Post
I'm not a HVAC tech but I've heard AC units will freeze up when they are low on refrigerant. Very annoying on a new unit.
RIGHT ON Andy !!!
Low on Refrigerant or Low air flow ???
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Old 06-04-2016, 06:11 PM   #13
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Pull the ceiling cover or filter cover down , look up inside and you will see a sensor that should be pushed into the finned area. The sensor will , if properly in place , sense temp and shut off compressor if freezing begins. This is for high humidity days. It could be it was not put in place when it was installed at the plant.
Our A/C unit froze up several times in a row last summer (in the Mojave Desert). Had to run it with the compressor off and fan on to blow the air over the ice to thaw it out in about 10 to 15 minutes (being 100+ degrees also helped thaw it out quickly...)

After getting tired of it continually freezing up and it being over 90 degrees inside, I did the above to check on the thermocouple sensor placement. It was pushed into the fins at the bottom by the drip tray where it never freezes. The fins above would be covered in a thick layer of ice.

I simply pulled the thermocouple temp sensor out of its incorrect position and pushed it back into the fins much higher up ( near the middle where the ice first forms). Never froze up again. It was always as cool inside as we wanted it to be for the rest of our 6 week trip through the desert southwest in August!
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Old 06-05-2016, 11:19 AM   #14
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Thanks for all the positive experiences. My issue was covered under warranty ( only 2 months old) haha. This was two things , the freeze sensor was bad and not hooked up properly. My thermostat was bad too. Everything replaced by CW. The was checked and not ammonia based product leaked out. (No freon in these units )

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Old 06-05-2016, 11:46 AM   #15
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X2 on using quick cool dump vent when first turning on while hot and humid. Once unit cools down and reduces humidity it can be closed and use the duct vents.
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Old 06-05-2016, 04:07 PM   #16
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Originally Posted by Lookin2camp View Post
Thanks for all the positive experiences. My issue was covered under warranty ( only 2 months old) haha. This was two things , the freeze sensor was bad and not hooked up properly. My thermostat was bad too. Everything replaced by CagW. The was checked and not ammonia based product leaked out. (No freon in these units )

We'll see how it works end of the month at the beach


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Glad you got it fixed. Having no AC sucks in the summer time.
Not understanding your last sentence though. You are showing a picture of a compressor designed to pump refrigerant (aka freon which is a brand name).
Ammonia can't be used with copper lines like the ones brazed to your compressor.Also ammonia is used in absorption units like a propane fridge and even 12 volt AC units. It is heated by propane or electric elements. The nomenclature tag on your unit should identify the refrigerant being used.
Maybe there is a new refrigerant out that I'm not familiar with (highly likely). I have been in the HVAC business for 40 years (started at 18)and the last couple of years I have semi-retired and have not kept up in the world.
A lot of these AC threads have gotten me curious about leaks, control boards and what not. When I get back home this week I'm pulling the top off of mine to see what has changed over the years besides the type of refrigerant. They used to use R12 and R-22 with mechanical controllers. The last I new of was R-134a and under-rated (amps)solid state control boards.
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Old 06-05-2016, 07:32 PM   #17
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This is the reason I'm posting pics. I'm not sure myself but I am being told this. I'm trying to learn these things as I go. Here is the info pic of the sticker on this unit. Unfortunately I don't have a pic of what was froze , but it was the coper line. Please respond Click image for larger version

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Old 06-05-2016, 08:20 PM   #18
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R-410A is a 50/50 mixture of R-32 (difluoromethane) and R-125 (pentafluoroethane) - no ammonia involved. Would have been just the freeze sensor involved in it freezing up. I thought it might be mis-positioned but didn't count on it being bad too. Thermostat would not have had anything to do with it freezing up... just not running at the times or conditions expected.
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Old 06-05-2016, 08:51 PM   #19
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R-410A is a 50/50 mixture of R-32 (difluoromethane) and R-125 (pentafluoroethane) - no ammonia involved. Would have been just the freeze sensor involved in it freezing up. I thought it might be mis-positioned but didn't count on it being bad too. Thermostat would not have had anything to do with it freezing up... just not running at the times or conditions expected.
What he said^^^^^^


If 410A is being used in these units, no wonder they are leaking. It runs very high pressures.
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Old 06-05-2016, 10:15 PM   #20
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Ok I'll run this thing in my driveway on the next hot day. If it doesn't cool I'll address CW. Can I check the levels of the 410A ? Or not accessible with the proper tools? apparently CW doesn't understand the system, which now im very concerned. Glad I posted pics. On the flip side , I'm hoping it was a freeze sensor issue. Thanks


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