Dometic Heating & Cooling - Recent Questions, Troubleshooting & Support

Same problem...then discovered my thermostat was set to Celsius instead of Ferinheight... pressed toe temp up and temp down buttons to change..fixed...

Dometic... | Answered on Jul 12, 2020

Check run-of on roof & see if it's been reduced lately, it may just be a plugged drain at base of unit on roof.

Dometic Rooftop... | Answered on Jul 01, 2020

red and white are positive and neg 12v
green is low fan
grey is high fan
yellow is cooling
blue is neg 12v(marked B-)

Dometic Rooftop... | Answered on Jun 11, 2020

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 +7.5
White (W) of the 2 wire goes to FUR.
Yellow (Y) to cool
Green (G) to fan
Orange or red from the RC lug goes to GND
Blue (H) goes to Hi Fan

Dometic Heating... | Answered on Jun 11, 2020

check if fan and compressor have power to them if ok check start up capacitors if no voltage check thermostat lines for power

Dometic Heating... | Answered on Jun 08, 2020

Mold can make you very ill depending on which type of mold it is. Mold forms in dark, wet environments and can be hard to get rid of. Your a/c unit needs taken apart and each piece that has mold will need to be cleaned thoroughly and carefully before re-installation.

Dometic Rooftop... | Answered on Feb 17, 2020

the other 2 units possibly have heat strips if not turn off the main unit should control furnace switches in power box or on control board

Dometic Heating... | Answered on Nov 23, 2019

make sure fan on auto and unit on heat if ok check heat strip

Dometic Heating... | Answered on Oct 19, 2019

Contact, American RV company at (626) 513-4777 they can help you out.

Dometic Rooftop... | Answered on Oct 12, 2019

Need to go up there and give more info. Look for outdoor fan...Is it spinning? Compressor on? Could be dual capacitor as they are 50% of problem lately

Dometic Heating... | Answered on Aug 22, 2019

I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer... rest is up to u.. U can also get free manuals

Dometic Heating... | Answered on Aug 17, 2019

It sounds like your Dometic unit is not getting power despite the breaker being on. Unless the Dometic unit has an internal fuse to check, I would get out a volt/ohm meter and check to see:
1. Is there power coming out of the breaker that goes to the ac unit?
2. Is there power at the terminals of the ac unit? (You can sometimes remove a ceiling cover to access the contacts on the on off switch.

Lastly is your RV hooked up to full power with two 110 volts on both legs beside the neutral and ground wire? If you are only feeding your RV with a standard 110 volt extension cord and using an adapter, that can mean half the circuits in your RV are energized while the other half 110 volt leg is not. You must energize the second leg by using a full 30 amp or 50 amp dual power cord.

RV's are funny. They require two 110 volt legs with a neutral and a ground. The two 110 volt legs are both of the same phase. There is no 220 volts between the two hot legs as they are in phase. A volt meter between the when hot would read zero volts, while each hot leg to neutral would read 110 volts.

Hope this helps.

Dometic Heating... | Answered on Aug 10, 2019

Direct Replacement? You can go to any hardware store and replace with any thermostat. If you have Air conditioning make sure you get one AC compatible

Dometic Heating... | Answered on Jul 12, 2019

Not finding what you are looking for?
Dometic Logo

3,104 questions posted

Ask a Question

Usually answered in minutes!

Top Dometic Heating & Cooling Experts

John Tripp
John Tripp

Level 3 Expert

4656 Answers


Level 3 Expert

85239 Answers

Lee Hodgson
Lee Hodgson

Level 3 Expert

4810 Answers

Are you a Dometic Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides