Replacing the control board in a Suburban SF30Q.

[Dan P]

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.

[Country Campers]

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

[Jlawles2]

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).

[Country Campers]

Dan P

Here is a photo of the furnace that I have.


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

[Dan P]

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

[Country Campers]

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

[gbkims]

...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

[Country Campers]

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

[gbkims]

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.

[Dan P]

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?

[ncitro]

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.

[Dan P]

Ok, after going a VERY long way around to learn how everything is put together, I can now tell you that the control board in a 2021 SF30Q furnace is not held captive by anything other what I'll call a plastic snap in, on the back of the top rail that the board slides in. Had I not been so cautious pulling on it, it would have popped out. Of course the 1st replacement board I purchased wasn't correct. The kind folks at Dinosaur say I need a Fan50 Plus Pins. Now that I'm familiar it shouldn't be much more than a 30 minute job to swap boards... Cheers.