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Thread: AC/Furnace Control Box

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    AC/Furnace Control Box

    We've had the mobile tech out three different times to repair our ac/heat system in our first month in our 2014 Bighorn Silverado 35 RES. It will run a day or two and then the thermostat goes blank. We've replaced the control box twice, but the problem persists. We are now into 90 degree temps and don't see any progress.

    Our tech says this is a new design and suspects feedback through the furnace wiring. Any assistance would be greatly appreciated.

    Sent from my SCH-I800 using Tapatalk 2
    Steve, Ruth, and Lili G
    Aubrey, TX
    2014 Bighorn Silverado Edition 35RES

  2. Print this Post   #2
    Moderator danemayer's Avatar
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    Re: AC/Furnace Control Box

    When you say you replaced the control box twice, are you talking about the thermostat, or the control box in the ceiling with the air conditioner? The thermostat signals a control box in the ceiling to turn on the furnace or the air conditioner. You could have a problem at either end.


    Dan and Ann Mayer & fur babies Callie the Rally Dog and Cooper
    2011 Landmark Rushmore
    • MorRyde 8K Independent Suspension
    • 8K Kodiak Disc Brakes
    • Goodyear G114 17.5" tires
    • RV Comfort Systems Cheap Heat
    • MorRyde 33x90 Sliding Cargo Tray
    • Torklift Glowstep Revolution Aluminum Steps & Dirt Destroyer

    2014 RAM 3500 Laramie
    • Cummins 6.7 Diesel, AISIN Transmission
    • 4x4, Long box, Crew Cab, DRW 3.73
    • Sailun Terramax A/T 4S, 235/80R -17. 5 Tires
    • Hensley BD3 TrailerSaver Hitch
    • Garmin RV760 GPS


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  3. Print this Post   #3

    Re: AC/Furnace Control Box

    I am referring to the box in the ceiling. We've also tried replacing the thermostat, but there is no juice to the stat. There is a 6 volt reading coming from the furnace when it is turned off as well. Thanks for taking an interest!

    Sent from my SCH-I800 using Tapatalk 2
    Steve, Ruth, and Lili G
    Aubrey, TX
    2014 Bighorn Silverado Edition 35RES

  4. Print this Post   #4
    Moderator danemayer's Avatar
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    Re: AC/Furnace Control Box

    Where are you measuring the 6 volts from the furnace? And are the rest of your 12V systems working? Interior lights, refrigerator?


    Dan and Ann Mayer & fur babies Callie the Rally Dog and Cooper
    2011 Landmark Rushmore
    • MorRyde 8K Independent Suspension
    • 8K Kodiak Disc Brakes
    • Goodyear G114 17.5" tires
    • RV Comfort Systems Cheap Heat
    • MorRyde 33x90 Sliding Cargo Tray
    • Torklift Glowstep Revolution Aluminum Steps & Dirt Destroyer

    2014 RAM 3500 Laramie
    • Cummins 6.7 Diesel, AISIN Transmission
    • 4x4, Long box, Crew Cab, DRW 3.73
    • Sailun Terramax A/T 4S, 235/80R -17. 5 Tires
    • Hensley BD3 TrailerSaver Hitch
    • Garmin RV760 GPS


    Is club membership right for you? Click here to learn more

    Check out our Owner-written User Guides and Troubleshooting Guides

  5. Print this Post   #5

    Re: AC/Furnace Control Box

    Going into the ceiling box from the furnace.

    Sent from my SCH-I800 using Tapatalk 2
    Steve, Ruth, and Lili G
    Aubrey, TX
    2014 Bighorn Silverado Edition 35RES

  6. Print this Post   #6

    Re: AC/Furnace Control Box

    Everything else seems to be working okay, although I did notice the hd side of our Directv seems to be on the fritz, now that you ask. The six volts dropped from 12 when we pulled the furnace fuse.

    Sent from my SCH-I800 using Tapatalk 2
    Steve, Ruth, and Lili G
    Aubrey, TX
    2014 Bighorn Silverado Edition 35RES

  7. Print this Post   #7
    Moderator danemayer's Avatar
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    Jul 2010
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    Re: AC/Furnace Control Box

    I think that's supposed to be 12V. Have you got 12V at other places in the coach? If yes, I think you need to run down why it's 6V at that location.


    Dan and Ann Mayer & fur babies Callie the Rally Dog and Cooper
    2011 Landmark Rushmore
    • MorRyde 8K Independent Suspension
    • 8K Kodiak Disc Brakes
    • Goodyear G114 17.5" tires
    • RV Comfort Systems Cheap Heat
    • MorRyde 33x90 Sliding Cargo Tray
    • Torklift Glowstep Revolution Aluminum Steps & Dirt Destroyer

    2014 RAM 3500 Laramie
    • Cummins 6.7 Diesel, AISIN Transmission
    • 4x4, Long box, Crew Cab, DRW 3.73
    • Sailun Terramax A/T 4S, 235/80R -17. 5 Tires
    • Hensley BD3 TrailerSaver Hitch
    • Garmin RV760 GPS


    Is club membership right for you? Click here to learn more

    Check out our Owner-written User Guides and Troubleshooting Guides

  8. Print this Post   #8
    Moderator danemayer's Avatar
    Join Date
    Jul 2010
    Location
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    Re: AC/Furnace Control Box

    Here's the furnace wiring diagram. 12V.
    Attached Files Attached Files


    Dan and Ann Mayer & fur babies Callie the Rally Dog and Cooper
    2011 Landmark Rushmore
    • MorRyde 8K Independent Suspension
    • 8K Kodiak Disc Brakes
    • Goodyear G114 17.5" tires
    • RV Comfort Systems Cheap Heat
    • MorRyde 33x90 Sliding Cargo Tray
    • Torklift Glowstep Revolution Aluminum Steps & Dirt Destroyer

    2014 RAM 3500 Laramie
    • Cummins 6.7 Diesel, AISIN Transmission
    • 4x4, Long box, Crew Cab, DRW 3.73
    • Sailun Terramax A/T 4S, 235/80R -17. 5 Tires
    • Hensley BD3 TrailerSaver Hitch
    • Garmin RV760 GPS


    Is club membership right for you? Click here to learn more

    Check out our Owner-written User Guides and Troubleshooting Guides

  9. Print this Post   #9

    Re: AC/Furnace Control Box

    That's what the tech thinks as well. He's asking permission to rewire the furnace on Monday. I will pass this along to him.

    Sent from my SCH-I800 using Tapatalk 2
    Steve, Ruth, and Lili G
    Aubrey, TX
    2014 Bighorn Silverado Edition 35RES

  10. Print this Post   #10
    Moderator danemayer's Avatar
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    Jul 2010
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    Re: AC/Furnace Control Box

    Have to wonder where the 6V is coming from and why the furnace fuse was pulled. And was the thermostat working with the furnace fuse plugged in?


    Dan and Ann Mayer & fur babies Callie the Rally Dog and Cooper
    2011 Landmark Rushmore
    • MorRyde 8K Independent Suspension
    • 8K Kodiak Disc Brakes
    • Goodyear G114 17.5" tires
    • RV Comfort Systems Cheap Heat
    • MorRyde 33x90 Sliding Cargo Tray
    • Torklift Glowstep Revolution Aluminum Steps & Dirt Destroyer

    2014 RAM 3500 Laramie
    • Cummins 6.7 Diesel, AISIN Transmission
    • 4x4, Long box, Crew Cab, DRW 3.73
    • Sailun Terramax A/T 4S, 235/80R -17. 5 Tires
    • Hensley BD3 TrailerSaver Hitch
    • Garmin RV760 GPS


    Is club membership right for you? Click here to learn more

    Check out our Owner-written User Guides and Troubleshooting Guides

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