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Old 06-05-2018, 01:53 PM   #1
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A/C acting erratic

I have a 2017 Blue Ridge 3920TZ. The front a/c when on by itself works fine. The rear a/c works fine by itself or when both a/c's are on. The front a/c when on with the rear a/c on the auto setting runs for about 10-20 seconds then shuts off for 4 minutes then comes on again for 10-20 seconds and repeats the cycle again. When on the high setting with the rear unit on it works fine. The fan runs on high and you can hear the compressor kick on & off when the room needs to be cooled. Is anyone else experiencing this with their dual a/c's? I took it to the dealer and they said they couldn't duplicate the problem. I have only been to one rv park with this unit so I'm wondering if it might be a park power issue.
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Old 06-05-2018, 04:11 PM   #2
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Which A/C's and thermostat do you have?

If it's the digital Dometic thermostat you may be able to initialize it and see if that helps.
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Old 06-06-2018, 04:20 AM   #3
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I have Dometic a/c's with 2 small square thermostats
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Old 06-06-2018, 04:50 AM   #4
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Quote:
Originally Posted by bhannay View Post
I have a 2017 Blue Ridge 3920TZ. The front a/c when on by itself works fine. The rear a/c works fine by itself or when both a/c's are on. The front a/c when on with the rear a/c on the auto setting runs for about 10-20 seconds then shuts off for 4 minutes then comes on again for 10-20 seconds and repeats the cycle again. When on the high setting with the rear unit on it works fine. The fan runs on high and you can hear the compressor kick on & off when the room needs to be cooled. Is anyone else experiencing this with their dual a/c's? I took it to the dealer and they said they couldn't duplicate the problem. I have only been to one rv park with this unit so I'm wondering if it might be a park power issue.
Start by setting both your fans to AUTO the fans will cycle with the compressor.
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Old 06-06-2018, 06:18 AM   #5
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Quote:
Originally Posted by bhannay View Post
I have a 2017 Blue Ridge 3920TZ. The front a/c when on by itself works fine. The rear a/c works fine by itself or when both a/c's are on. The front a/c when on with the rear a/c on the auto setting runs for about 10-20 seconds then shuts off for 4 minutes then comes on again for 10-20 seconds and repeats the cycle again. When on the high setting with the rear unit on it works fine. The fan runs on high and you can hear the compressor kick on & off when the room needs to be cooled. Is anyone else experiencing this with their dual a/c's? I took it to the dealer and they said they couldn't duplicate the problem. I have only been to one rv park with this unit so I'm wondering if it might be a park power issue.
Do what Cavie said and also, the a/c fan will run on high till the temp gets to within a few degrees of the thermostat setting and at that time the fan speed will change to low. The a/c will pause momentarily while the fan speed is changing.
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Old 06-06-2018, 01:27 PM   #6
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Both a/c's are on the auto setting. The rear a/c works fine. It kicks on runs until the area has reached the desired temp. Then stays off until it is called upon again to cool the area. The front a/c kicks on runs 10-20 seconds then shuts off for 4 minutes and then kicks on again for 10-20 seconds and does this continuously. There is no way the front bedroom area is being cooled to the set temperature in 10-20 seconds. However when the rear a/c is off and the front a/c is on any fan setting the front a/c works properly.
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Old 06-06-2018, 01:37 PM   #7
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Since you have the single zone thermostats, you can initialize the one that isn't working correctly. The process is in the manual for the units. There's a copy in the library if you don't have one.
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Old 06-06-2018, 01:42 PM   #8
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Does the front a/C dump air directly down or is ducted? If ducted open the air dump and try it. You may need a hard start capacitor.
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Old 06-06-2018, 01:48 PM   #9
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Both a/c's are the "whisper quiet" style. No dumping option. I took it to a dealer and they said they couldn't duplicate the problem. That is why I was wondering if it may be a power problem because it works fine with the rear a/c off.
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Old 06-06-2018, 02:11 PM   #10
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Are you plugged in to a 50 amp circuit? Voltage good?
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Old 06-06-2018, 03:11 PM   #11
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Yes I was plugged into 50a. I don't know how good the electric was. The dealer also plugged into 50a at their location and couldn't duplicate the problem.
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Old 07-16-2018, 09:40 PM   #12
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You can have fifty amp service and not have enough amperage to run both units. Next time try running one then shut it off and try the other one to see if it is a unit problem or amperage problem. We had the same issue that couldnít be found. Havenít had that problem since.
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Old 07-16-2018, 09:41 PM   #13
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You can have fifty amp service and not have enough amperage to run both units. Next time try running one then shut it off and try the other one to see if it is a unit problem or amperage problem. We had the same issue that couldnít be found. Havenít had that problem since.


We have the same RV you do. Figured it was low amperage
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Old 07-29-2018, 07:52 PM   #14
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Mine recently started doing the same thing except itís the rear unit that cycles. It is the bigger of the two. Only when I try to run them together. Weíve been to 3 different campgrounds and all had 50A service. Not sure what the chances that all three would have bad amperage. We go again in a few weeks and we will have 50A again. Iíll need to bring a multi meter along and check.
The only thing Iíve done is replaced the capacitor hoping it would correct the problem. Any other suggestions?
OP, did you ever find a solution to your problem?
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Old 07-30-2018, 01:46 PM   #15
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I went out 4th of July weekend to a different campground than I usually go to and did not have a problem with the A/C. I'm going back to the original campground the weekend before Labor Day weekend and we'll see how it goes.
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Old 07-30-2018, 06:12 PM   #16
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Thatís interesting. Let us know how it goes. Iím going in two weeks, this will be the fourth different campground with 50A. Iím doubting itís an amperage problem for me. Iíve been to all of these campgrounds before without troubles for the last 5 years. I suppose stranger things have happened. Iíll let you know if I figure anything out!
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