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Old 10-28-2021, 06:49 AM   #1
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Suburban 42G furnace question.

It has been a little chilly in central NC the last couple of nights. I turned the furnace on Wed night and went to bed.
When we woke up it was 60 degrees inside and mid 40s outside. The furnace was off. Triggered it back on, it fired and then shut down after a few minutes.
No biggy, we carry small ceramic heaters and the RV has a fireplace that heats. When it got light out I pulled the cover off of the outside wall looking for any intake or exhaust tube blockage and found none. I had my wife fire the furnace from inside with the cover still off and it ran and ran and ran. After about 10 minutes I slid the cover back on and it went into safety mode and shut off.
My question is this. The limit switch is either open or closed but can the sail switch not close the circuit with the slightly lower air velocity the outlet tube and cover created when it was reinstalled?
I always thought that they either worked of they didn't.
Thanks for any thoughts or replies.
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Old 10-28-2021, 05:40 PM   #2
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I have a SF-42 . The sail switch and over temp are in series , so both must be closed to complete the circuit .

By having the outside cover off you're allowing the fan more air than is available from inside the coach via the return air grill . I would check that something isn't blocking any return air path.

Have you ever removed the furnace for a complete clean up ?

The amount of dirt stuck to the blower fan ( squirrel cage ) will shock you .

Because I winter in the desert and it gets very dirty and clean up is on my two year maintenance list.
Because of the way my furnace mounts , I can have it out on the bench in under 15 minutes. Yours maybe similar ; MARK ALL WIRES and take pictures.

The white hot spot on the heat exchanger was due to a mud wasp nest that had to be washed out .
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Old 10-29-2021, 06:27 AM   #3
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Thanks for the reply. I didn't pay that much attention to the fan cage, I'll take another look at that. That could certainly affect it's efficiency.
The intake is high up on the wall over the kitchen area where Sweet Thing can't block it.
The unit had very little debris in it but I'll hit it with the shop vac when we get home this weekend.
The unit pulls out from the outside like yours so if I need to I will.
Thanks for the help.
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Old 10-29-2021, 11:20 AM   #4
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Put aluminum screening over the grate on the outside door to keep muddobbers out. Also any openings on other appliances, even underneath.
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Old 10-29-2021, 12:04 PM   #5
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Quote:
Originally Posted by Toby Dog View Post
The intake is high up on the wall over the kitchen area where Sweet Thing can't block it.
That sounds like a VERY odd area for a cold air return , they're usually right at floor level . I'm thinking you should try and get eyes on the furnace housing from inside the RV to fully check things out.

My Newmar there was carpet stapled to the sides and top of the furnace compartment ( noise reduction ) of course the staples let go after the wood dried out ( 18 years ) and the carpet blocked off 1/2 the return air .
Carpet is now secured with metal straps and screws.
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Old 10-30-2021, 05:43 AM   #6
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I agree with the location but the inlet is huge and has a warning label next to it that you need binoculars to read. Unless you are standing on the counter. It's also a straight shot down to the furnace. I can access the furnace box from under the sink but the whole unit pulls out from the outside of the coach.
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Old 10-30-2021, 08:16 PM   #7
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Pulling return air from high up ; I'd love to get hands on with that design engineer .

I would imagine , that your feet are always cold , in the RV.
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Old 11-04-2021, 11:28 AM   #8
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Quote:
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Pulling return air from high up ; I'd love to get hands on with that design engineer .

I would imagine , that your feet are always cold , in the RV.
I looked at interior video of OPs RV and YEP....way up above cabinet is large Grill that is directly inline with Furnace down below

Warm air rises.......
Floor registers pump out the heat...return pulls warm air from ceiling area. Nothing to obstruct the return flow path
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Old 11-04-2021, 11:45 AM   #9
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I went out this AM to fool with it before the rain started. I kicked the furnace on before I realized I had turned the propane off when we got home Friday. Doing other things I realized the blower was still on but the furnace never ignited after I turned the propane back on. I shut off the furnace at the stat and then turned it back on a few minutes later and it ran fine for 20 minutes until I kicked it off. I don't like stuff working that wasn't without doing anything but hey I'm not complaining. I'll post back if it quits again but maybe it blew out a spider web or a hairball who knows.
Thanks to everybody.
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