How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Michael Reush Your Own Question
Michael Reush
Michael Reush, RV Technician
Category: RV
Satisfied Customers: 3249
Experience:  Serving the rv industry since 1977
Type Your RV Question Here...
Michael Reush is online now
A new question is answered every 9 seconds

rv..coleman..few minutes..very loud humming noise and started slowly

This answer was rated:

I am an RV tech with a Coleman basement heat pump issue. It's a model 6796A821 that would start up and run for a few minutes then the fan would stop. The fan made a very loud humming noise and started slowly. With a new cap it won't run at all. The unit is installed in a '92 Albion 5th wheel basement.

I cannot find any information on this unit other than the generic wiring diagram for the control board.

I suspect the thermostat as it hadn't been touched in a couple of years and the heat/off/cool switch doesn't feel right...soft "clicks" and mushy stops.

Any and all info or a link to a service manual would be great!

Ken's Camper & RV Service
Newport, NC

Hi There!!!


Thanks for Choosing Just Answer....


THIS should be the service manual for this series... I would look at the fan first since it started very slow and made a noise, the bearings may have seized up, I believe on these units there is a tiny spot you can put a few drops of oil in. Checking the selector switch is also a very good idea, the capacitor was replaced so probably not the fault... I hope that manual helps, if you have any other questions or concerns please feel free to contact me... I feel your pain on this one, I know some of these basements units are a royal pain to pull out..


Thank You!!! Please hit ACCEPT for my efforts, Positive feedback and BONUS welcomed!!!


Customer: replied 7 years ago.
this manual does not apply to the unit. It covers the 6799 roof top units but not the 6796 basement unit. I have this one and it's not really any help as the components and wiring are different.



NO Luck finding this particular model, I went through all the stuff I had laying around... So at this point I am going to Opt Out, this will allow other RV experts to respond, I want you to have the correct information, I understand it is crucial for troubleshooting this unit... I do not know when another RV expert will respond...


Thanks, Robert

Hi, this is Michael, I'm real familiar with this unit. First of all to see if the thermostat is sending a signal to the unit, when looking at the control board, you will see a green light towards the top, if it is receiving a signal it will be blinking......Now on the white plug with small multicolored wires towards the center, this is the thermostat wiring, ck the purple wire, and the black wire, the purple is for low fan, and the black wire is for high fan. I apoligize if I am telling you something you already know. Is the schematic missing from the back of the electrical cover plate? Ck the amperage draw when the fan does come on, this will tell us if its the motor..............Michael...........................I had a second thought: is it the interior or exterior fan that is the problem?
Michael Reush, RV Technician
Category: RV
Satisfied Customers: 3249
Experience: Serving the rv industry since 1977
Michael Reush and other RV Specialists are ready to help you
Customer: replied 7 years ago.
I found a broken neutral at the contactor. I repaired that and then discovered the fan motor is so rusty it seizes after about 10 minutes. It's old enough to have oil cups but it was too late. This is a single motor unit but if nothing else I can probably get it out of Grainger's catalogue.

Thank you for your time and efforts!

Great!!!!!!!!!!!!!!!!!!! Thanks for accepting, Michael

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... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...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. Dutch USA
< Previous | Next >
  • 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. Dutch USA
  • 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. Jack USA
  • 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 P Elm 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. Phil Marysville, 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. Charles Walnut 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!
    Sue Charleston, WV

Meet The Experts:

  • gene


    RV Mechanic

    Satisfied Customers:

    28 yrs exp in the industry
< Last | Next >
  • gene's Avatar


    RV Mechanic

    Satisfied Customers:

    28 yrs exp in the industry
  • Nick's Avatar


    RVIA Certification

    Satisfied Customers:

    5 years RV repair and reconstruction, Fleetwood RV Training course completion.
  • Steve F.'s Avatar

    Steve F.

    RVIA Certification

    Satisfied Customers:

    Journeyman and Master RV technician, Mechanical & Aerospace Engineer. RVIA Technical Consultant
  • Robert's Avatar


    RV Mechanic

    Satisfied Customers:

    18 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.
  • Randall's Avatar


    RVIA Certification

    Satisfied Customers:

    RVDA/RVIA Master Certified Technician with many years experience.
  • Wayne's Avatar


    RV Mechanic

    Satisfied Customers:

    Work on several type of Rv engine, Trans, brakes
  • RIP ROBERT's Avatar



    Satisfied Customers: