RV

Have RV questions? Ask an RV mechanic online.

Ask an Expert,
Get an Answer ASAP!

No power to thermostat from main a.c, Consistent, Open

Customer Question
No power to thermostat...

No power to thermostat from main a.c

Mechanic's Assistant: Is the power loss consistent, or does it fluctuate?

Consistent

Mechanic's Assistant: What is the model/year of your RV?

Open range, 2017 dometic ac

Mechanic's Assistant: Are you fixing your RV yourself? What have you tried so far?

Took shroud off ac unit checked for voltage, had 125v, have led thermostat checked for 12 v nothing

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Can't think of anything

Submitted: 11 months ago.Category: RV
Show More
Show Less
Ask Your Own RV Question
Answered in 5 minutes by:
7/30/2017
RV Mechanic: Randall, RVIA Certification replied 11 months ago
Randall
Randall, RVIA Certification
Category: RV
Satisfied Customers: 14,271
Experience: RVDA/RVIA Master Certified Technician with many years experience.
Verified

Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.

Ask Your Own RV Question
RV Mechanic: Randall, RVIA Certification replied 11 months ago

Which thermostat do you have? Single Zone or Comfort Control II?

Ask Your Own RV Question
RV Mechanic: Randall, RVIA Certification replied 11 months ago

How did you determine that there was no voltage? Small digital multimeter?

Ask Your Own RV Question
Customer reply replied 11 months ago
Thermostat has 3 buttons, I used a digital mm
RV Mechanic: Randall, RVIA Certification replied 11 months ago

So you need to go up to the control box and check the red wire coming INTO the module and see if there is power there. And check the black lead to be sure that is grounded. If no ground there or coming down to the thermostat, it won't register any DC voltage. Let me know what you find. All follow ups are included in our fee. No time limit.

Ask Your Own RV Question
RV Mechanic: Randall, RVIA Certification replied 11 months ago

If you have a central air return grill, this will be under the air cleaner. If not, it is up on the A/C and accessed from the top.

Ask Your Own RV Question
Customer reply replied 11 months ago
Okay
RV Mechanic: Randall, RVIA Certification replied 11 months ago

On many of these installs the furnace circuit supplies power to the control module. So it that lead is not powered up, then check there.

Ask Your Own RV Question
Customer reply replied 11 months ago
13.23 vdc on furnace lead
Customer reply replied 11 months ago
Are you still with me?
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a rv mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask gene Your Own Question
gene
gene
gene, RV Mechanic
Category: RV
Satisfied Customers: 1,100
1,100 Satisfied Customers
Experience: 28 yrs exp in the industry

gene is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV.

DutchUSA

Highly recommend this RV expert. Prompt, good and detailed answers were given. Very willing to help with genuine concern. I will ask for him next time.

JackUSA

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

< Previous | Next >

Meet the Experts:

gene

gene

RV Mechanic

1,100 satisfied customers

28 yrs exp in the industry

Nick

Nick

RVIA Certification

664 satisfied customers

5 years RV repair and reconstruction, Fleetwood RV Training course completion.

Steve F.

Steve F.

RVIA Certification

443 satisfied customers

Journeyman and Master RV technician, Mechanical & Aerospace Engineer. RVIA Technical Consultant

Randall

Randall

RVIA Certification

14,271 satisfied customers

RVDA/RVIA Master Certified Technician with many years experience.

Robert

Robert

RV Mechanic

13,563 satisfied customers

18 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.

Wayne

Wayne

RV Mechanic

979 satisfied customers

Work on several type of Rv engine, Trans, brakes

Chris (aka-Moose)

Chris (aka-Moose)

RV Mechanic

502 satisfied customers

16 years of experience

< Previous | Next >

Related RV Questions
I have a duo-therm AC/FURNACE, with an analog thermostat.
Hi guys, I have a duo-therm AC/FURNACE, with an analog thermostat. Thermostat input is a dead issue with both units. There is no power to the thermostat although I have voltage downstream of all 120v … read more
Randall
Randall
RVIA Certification
14,271 satisfied customers
AC turns on...runs for a while then shuts down. I turn the
AC turns on...runs for a while then shuts down. I turn the thermostat to off; let the green light go off on the thermostat. Wait about 2-3 minutes - turn back to AC and it turns back on. the unit runs… read more
Randall
Randall
RVIA Certification
14,271 satisfied customers
No power to front ac breaker not kicked and there is power
no power to front ac breaker not kicked and there is power at breaker … read more
Randall
Randall
RVIA Certification
14,271 satisfied customers
I have a 2017 dutchman, aspen trail, 31', with 1 rooftop A/C
I have a 2017 dutchman, aspen trail, 31', with 1 rooftop A/C unit. I had my rv plugged into the house and the house breaker tripped, I reset the breaker and the air conditioner would not come back on.… read more
Randall
Randall
RVIA Certification
14,271 satisfied customers
Dometic air conditioner/furnace are not working, it's an
yes, I amboth AC and DC to the air conditioner, but no power coming out of the controller boxpower … read more
Randall
Randall
RVIA Certification
14,271 satisfied customers
Domestic thermostat is not lighting up with any button which
Domestic thermostat is not lighting up with any button which I push. Just replaced with a new one. Have turned breaker off that I'm plugged into and started generator. Still no response from A.C. cont… read more
Randall
Randall
RVIA Certification
14,271 satisfied customers
The thermostat has no power. 2011 montana has dometic 2 zone
the thermostat has no power JA: What's the make/model/year of your RV? Customer: 2011 montana has dometic 2 zone didgetal JA: Are you fixing your Montana yourself? What have you tried so far? Customer… read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,563 satisfied customers
12 volt system not charging properly older 93rd might I need
12 volt system not charging properly older 93rd might I need to change battery … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,563 satisfied customers
I needed a new t-stat for my 2010 Puma which was t-stat
I needed a new t-stat for my 2010 Puma which was t-stat number(###) ###-####000 but when I placed an order for one I was told that the part was now a(###) ###-####000. I ordered that part which looks … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,563 satisfied customers
We have a duo therm in our 2001 Alfa gold. We were running
We have a duo therm in our 2001 Alfa gold. We were running the air conditioner and turned on something else and popped the breaker on the park post. Reset the breaker and turned air back on, but it is… read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,563 satisfied customers
Camper: 2011 Crusader 5th wheel. Problem: The Dometic ac
Camper: 2011 Crusader 5th wheel. Problem: The Dometic ac unit compressor will not shut off regardless of the position of the thermostat setting. I have to use the 20amp breaker to turn it off. This is… read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,563 satisfied customers
My domestic thermostat will not come on. I took it off
My domestic thermostat will not come on. I took it off because it was showing an error message. When I put it back it won't come on… read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,563 satisfied customers
I have a couple problems. First my a/c blower kicks on when
I have a couple problems. First my a/c blower kicks on when I try to kick on heat. A.c. in cieling heat in floor. Shud a.c. kick on? And my fridge is a dometic. It needed defrosted so I turned it off.… read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,563 satisfied customers
My name is, I have a Dometic 15,000 btu roof top a/c unit
Hi my name is***** have a Dometic 15,000 btu roof top a/c unit that is not working, control center is not coming on. Any suggestions on what to check?… read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,563 satisfied customers
I have a 2013 Keystone Alpine 3535RE, I just got done getting
I have a 2013 Keystone Alpine 3535RE, I just got done getting my camper ready for the season after a long Minnesota winter. I did have several mice that had got into my camper, anyway now my Dometic d… read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,563 satisfied customers
I have a 2004 Daybreak by Damon. We are changing out the AC
I have a 2004 Daybreak by Damon. We are changing out the AC unit, and we have 110, but we have no 12 Volt. Can you tell me where the fuse for heat/ac might be located. There is a chance that we blew a… read more
Randall
Randall
RVIA Certification
14,271 satisfied customers
I have a 2009 hobby caravan with a Dometic AC/DC convertor
I have a 2009 hobby caravan with a Dometic AC/DC convertor power supply ,model SMP214-02, product numberNNN-NN-NNNN there is 230v ac being supplied to the unit but no 12v DC coming out, is there a res… read more
Randall
Randall
RVIA Certification
14,271 satisfied customers
Tony C. RV mechanic about the Dometic Duo..ac..metal..schematic
Another question for Tony C. RV mechanic about the Dometic Duo-therm 57915.531 roof top ac problem previously discussed. Tony, I followed your instructions, pulled the cover off top and found a metal … read more
technotony
technotony
Vocational, Technical or Trade School
212 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x