Dometic Heating & Cooling - Recent Questions, Troubleshooting & Support

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Awning retracts at random

some awnings have a sensor that retracts the awning if wind elevates to certain level. i wish mine did. i have seen them ripped off rv's.
9/29/2021 7:16:14 AM • Dometic Heating... • Answered on Sep 29, 2021
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My dometic air conditioner on my Jayco Silverline 2018 caravan won't turn on unless it is in ventilation mode

no info -look in your paperwork for your trailer unit and the mystery a/c unit and look up the trouble code in owners manual --notify jayco of problem --do online search of a/c using make and model for trouble shooting guide - rv shop
9/2/2021 12:41:20 AM • Dometic Heating... • Answered on Sep 02, 2021
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Replacing a duotherm 3105058 thermostat

I was replacing a DUO-Therm 3105058 Rev A. very old Thermostat in a Coachman RV with 3106995.032 from Amazon. After looking all the information on the directions it was clear I would have to play a hit or miss on some of the wiring. Instead of using the same coding, such as RC, RH, G, Yellow and such. they used the function and I had to guess at some.Here is the wiring I found worked:There are 6 wires. One set of two wires (white On the W & red on the RH) and the set of 4 (yellow On the Y, green on the G, red on the RC and blue on the H). So to keep it simple the red on the RH went to the +7.5. The White on the W went to the FUR. HS/HP not used. the Yellow from the Y went on the cool. The green on the G went to the fan. The red on RC went to GND. and the Blue on H went to Hi fan.So red (RH) of the 2 wire goes to +7.5White (W) of the 2 wire goes to FUR.Yellow (Y) to coolGreen (G) to fanOrange or red from the RC lug goes to GNDBlue (H) goes to Hi Fan
8/12/2021 9:34:36 PM • Dometic Heating... • Answered on Aug 12, 2021
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I need an electrical wiring diagram for an rv air conditioner. Dometic model QC135-A.

So original was ecm and you’re installing psc?? All low voltage speeds will go away and you just need to break the new, high voltage speeds, with a relay. Hope that helpsI can’t find info on the 135a. Does it have a control board to land wired to?? What model motor???Can’t make out the original wiring diagram. The white is your common or neutral. The different speeds are for constant fan speed, cooling speed, and heating speed, this is your hot. Not sure if you have a control board in your unit but if you do it will say “common/ fan/ cool/ heat/ park for places to land your wires. The browns go to capacitor and the orange and purples would get swapped if it were running backwards. ( meaning blowing air out of filter rather than pulling air through filter. Zip tie loose wires to prevent getting caught by wheel.
7/15/2021 10:51:15 AM • Dometic Heating... • Answered on Jul 15, 2021
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Need advice wiring new motor into old Dometic a/c unit.

On a single phase universal motor with a start and a run capacitor, that is handy. The start capacitor is fully automatic as there is an internal centrifugal contact that breaks the contact when the motor reaches near running speed. The run capacitor puts one of the motor windings out of phase with the other and determines the direction. Placing the run capacitor on the neutral will make the motor go the other way than on the live.
7/14/2021 7:03:43 PM • Dometic Heating... • Answered on Jul 14, 2021
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My rv air wont work on high?

could be the selector switch turn off power switch low and high wire if it blows high replace selector switch if it does not work replace motor. Tom
7/11/2021 6:17:05 AM • Dometic Rooftop... • Answered on Jul 11, 2021
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457915.711co need manual

A/C condenser comes on but fan doesn't.Have changed compasitor but still no fan.Fan turns freely.
6/26/2021 12:29:42 AM • Dometic Rooftop... • Answered on Jun 26, 2021
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Where can I purchase Dometic remote controller p n ir0101

Contact, American RV company at (626) 513-4777 they can help you out.
5/4/2021 5:18:32 PM • Dometic Rooftop... • Answered on May 04, 2021
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I have a Dometic RV airconditioner roof mounted,

Your probably looking at the control module number or something in that area. When you have the ceiling assy off as in cleaning filters, look for a sticker directly on the base of the roof unit. Look all around on that base, even behind wiring harness, you should find a model number and serial number.
11/21/2020 9:38:06 PM • Dometic Rooftop... • Answered on Nov 21, 2020
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RV air conditioner. Compressor running, fan stops before cool

The fan motor is getting hot and going off on the internal overload in the motor.
This is caused by either a low voltage, a bad capacitor, or tight or dry bearings in the motor.
To check the bearings turn the power off to the unit, then spin the fan blade if it spins freely then the bearings are ok.
To check the capacitor you will need some kind of tester or you can buy a capacitor and replace it, that's what a lot of people do. They usually don't cost very much.
To check the voltage you will need a voltmeter and measure the volts at the unit.
10/27/2020 11:49:04 PM • Dometic Rooftop... • Answered on Oct 27, 2020
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I have a Dometic rooftop air conditioning unit for a trailer it's just blowing warm air any suggestions how to fix this

I'm sorry for posting here but I have the same problem and I want to know if you managed to find a solution
10/25/2020 1:35:36 PM • Dometic Heating... • Answered on Oct 25, 2020
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Roof top not cooling as it should

The first thing I would do is pull the cover off and use a coil cleaner to clean the condensing coil and the evaporator coil for the inside unit you will have to pull the metal cover off to clean it with a no rinse type coil cleaner. Once you have the cover off on the name plate it will tell you what type of refrigerant to use most likely R-134a or R-22. Most of these are not serviceable without installing a piercing valve. As they do not usually loose freon.
10/15/2020 10:28:37 AM • Dometic Rooftop... • Answered on Oct 15, 2020
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Rv roof air always ices up

most likely a dirty filter.
10/15/2020 5:32:30 AM • Dometic Rooftop... • Answered on Oct 15, 2020
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Water coming from ceiling about

Does the unit work other, than the leaking?If it does you need to install a square seal between the ac unit and the roof.You can either buy the seal from Ebay or I would recomend an Rv Repair place.(They Might even be able to install it where the Rv Sits)
10/15/2020 5:31:52 AM • Dometic Rooftop... • Answered on Oct 15, 2020
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I have a travel trailer

If it's leaking inside where filter cover is, then real good chance the drains being plugged is the only problem. If water (condensation) not running off roof when operating in cool mode, then I'd bet drains, which are located under unit on roof, and you should see them sticking down like buttons. They have a hole in side that needs cleaning with a pipe cleaner or similar to open them up. If need be, shut off power to unit and remove top cover on roof unit and look for the drain holes in base, and clean them out. If water comes in while raining, but AC not running, then it's gasket. That is remedied by removing ceiling assembly (just screws) and 4 bolts that pull/hold the upper and lower assemblies together, unplug wiring to upper unit, and simply lift it off, change gasket and re-install. Tighten those 4 bolts equally when gasket is aligned properly over hole, only until gasket is approx 1/2, original thickness. Plug harness back in and your done. (about an hours work.) Only other thing that may be wrong is styrofoam drip tray for cooling unit, under cover on roof may have a crack , allowing condensation to leak in. If that 's the case, you can try to find a sealant compatible with styrofoam to seal those cracks.
9/19/2020 3:24:26 AM • Dometic Rooftop... • Answered on Sep 19, 2020
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Error code of E4 on Dometic HP air conditioner ??

16. SYSTEM RESET
a. Turn the ON/OFF switch to “OFF” position.
b. Simultaneously depress and hold the MODE and ZONE
push-buttons while turning the ON/OFF switch to “ON”.
FF should appear in the LCD display until the MODE
and ZONE push-buttons are released.
c. When a dip switch is turned on or off after initial configu
ration, a system reset will need to be done before the
Comfort Control CenterTM will recognize the updated selection. Try this. This is for the five button thermostat. Did you check the dip switches to be sure the proper ones are turned on? I need to know which stat you have 4 or 5 button. I have trouble shooting for both.
If you notice reset needs to take place after a dip switch is turned on or off. The dip switches are on the circuit board. You need to drop the lower cover. the dip switches will read in this order #1 heat strip/ #2 zone2/#3zone3/ #4 zone4/#5 furnace/#6 differential/#7stag/#8 gen start. Check this out and be careful. Turn off the stat to change dip switches. On will be toward the description. If you don't have remote start gen set the dip should not be on. If you dont have a Zone 3 the dip should not be on, etc.
Any questions feel free to post back
Thank you for using fixya
Jerry
9/15/2020 4:07:32 PM • Dometic Rooftop... • Answered on Sep 15, 2020
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Power to the roof but not working

In my own oppinion I would if it is available, as you do not know if something shorted out..also note that you may have too as updates are constantly done in the RV bussiness..I worked at 2 RV dealerships and there were constant updates especialy Dometic refrigerator and cooling units. Stop at the local Rv shop and see what they have or they may order it for you.
9/10/2020 9:46:40 AM • Dometic Rooftop... • Answered on Sep 10, 2020
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RV AC is working fine,

Normally, the condensate will drain out of the unit onto the roof and off the edge to the ground. Remove your cover inside (probably 2 screws) and tighten the 4 bolts you will find inside. If they are tight, go to your RV supply place and get new roof gasket. Remove the AC and insert the new gasket and resecure the AC to your roof.

Thanks for your question @ FixYa.com
8/20/2020 4:41:40 AM • Dometic Rooftop... • Answered on Aug 20, 2020
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