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Replacing the control board in a Suburban SF30Q.

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  • Replacing the control board in a Suburban SF30Q.

    It looks like I need to replace the control board in my 25G's Suburban SF30Q. The board is way back in there, but it looks like it's on slides and may just pull out... Does anyone know, to replace the board, does the furnace need to come out? Is the board held captive and if so how do you release it? Just looking for tips before I start jerking on things. Thank-you.

  • #2
    Originally posted by Dan P View Post
    It looks like I need to replace the control board in my 25G's Suburban SF30Q. The board is way back in there, but it looks like it's on slides and may just pull out... Does anyone know, to replace the board, does the furnace need to come out? Is the board held captive and if so how do you release it? Just looking for tips before I start jerking on things. Thank-you.
    I have a "spare" furnace at home and will get you some pictures later today, hopefully they will help you.

    Brian
    Brian & Michelle
    2018 Reflection 29RS Oct.2017 build date, EMS-HW50C , Lippert Remote
    2015 Chevy 3500HD CC LB Duramax , Reese Elite 18K

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    • #3
      Dan P Been a long time since I pulled one apart, but from memory, I pulled the board from the back side not the out side. In doing that, you need to be cautious of the igniter wire that is attached to the coil. I broke the connector when pulling the board out (was not working on the board, but mud dobber buildup on the fan).
      Joseph
      Tow
      Vehicle: 2018 GMC K2500 Denali Diesel
      Coach: 303RLS Delivered March 5, 2021
      South of Houston Texas

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      • #4
        Dan P

        Here is a photo of the furnace that I have.
        Click image for larger version

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        This is taken from the blower end which should be the end visible from removing the cover on the outside of the RV. There is a metal plate , marked by the arrow , that has to be removed to allow the circuit board to slide towards you. To remove the metal plate there are 4 screws that hold the upper blower cover on , 2 marked with the circles 2 on the lower portion. If you can remove the blower cover enough and remove the wire connections on the board you should be able to replace the circuit board with out removing the whole furnace. I am not sure if your furnace is horizontal or vertical but this should be the same for both.
        Hope this helps,

        Brian
        Brian & Michelle
        2018 Reflection 29RS Oct.2017 build date, EMS-HW50C , Lippert Remote
        2015 Chevy 3500HD CC LB Duramax , Reese Elite 18K

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        • #5
          Thank-you Bryan. I just looked at mine again and tugged on it a bit. The blower end of the board is free but the back, or heat exchanger end is captive which is where you mention a metal plate. I'll look at separating the blower cover tomorrow and flinging the meatal plate. If you look at my pics, can you see anything different from your situation? Thanks!

          2021 Momentum 25G

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          • #6
            The furnace I have is a SF 35Q, same but a little different. I do not see the metal strip in the slot on yours that I have outlined on my photo. If you are up to it the whole furnace unit slides right out. You will have to disconnect the gas line, and the wires on the left of picture 2, then there is 2 screws , one is the lower left of picture 2, the other should be on the other side same position. This should allow the complete unit to slide out of the the furnace box, would make it much easier to service the board.

            Brian
            Brian & Michelle
            2018 Reflection 29RS Oct.2017 build date, EMS-HW50C , Lippert Remote
            2015 Chevy 3500HD CC LB Duramax , Reese Elite 18K

            Comment


            • #7
              Originally posted by Dan P View Post
              ...The blower end of the board is free but the back, or heat exchanger end is captive which is where you mention a metal plate. I'll look at separating the blower cover tomorrow and flinging the meatal plate. ... 2021 Momentum 25G
              From your photos, the furnace looks to have the 3rd Gen circuit board and appears to slide into that channel and probably has a screw of push in thru one of the rear holes holding it in place.

              Suburban SB521099 3G Furnace Fan Control Board

              Click image for larger version

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              Click image for larger version

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              Gene and Kim
              2015 Grand Design Reflection 317RST
              2017 RAM 3500 CC, LB, 4x2, 6.7L CTD

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              • #8
                gbkims

                Gene,

                Where do you find this kind of information? Is there a secret part of the web that we mere mortals do no know about?

                You always seem to find the most useful and informative information , inquiring minds need to know.

                Brian
                Brian & Michelle
                2018 Reflection 29RS Oct.2017 build date, EMS-HW50C , Lippert Remote
                2015 Chevy 3500HD CC LB Duramax , Reese Elite 18K

                Comment


                • #9
                  Originally posted by Country Campers View Post
                  gbkims

                  Gene,

                  Where do you find this kind of information? Is there a secret part of the web that we mere mortals do no know about?

                  You always seem to find the most useful and informative information , inquiring minds need to know.

                  Brian
                  Brian,

                  I just hunt and peck to see what I can find.
                  Image searching sometimes gives me a clue.
                  Gene and Kim
                  2015 Grand Design Reflection 317RST
                  2017 RAM 3500 CC, LB, 4x2, 6.7L CTD

                  Comment


                  • #10
                    Gene, there isn't a screw in any of the rivets. Perhaps through the board where I can't see it. Either way, looks like I'll have to slide it (the whole unit) out of the cage. It's so odd to be engineered this way... Any comment on the Dinosaur Electronics board?

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                    • #11
                      Originally posted by Dan P View Post
                      Gene, there isn't a screw in any of the rivets. Perhaps through the board where I can't see it. Either way, looks like I'll have to slide it (the whole unit) out of the cage. It's so odd to be engineered this way... Any comment on the Dinosaur Electronics board?

                      I've never used their furnace board but I've used their Atwood water heater replacement and Dometic fridge replacements with great success.
                      Neil Citro
                      2018 Reflection 28bh
                      2019 F350 6.7L Long Bed Crew Cab

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