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Old 01-21-2021, 04:39 PM   #1
Spshg
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Dometic DFMD35121

Anyone know where to order a sail switch for this furnace? Seems like it would be a good idea to have one on hand. Thx!
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Old 01-21-2021, 04:50 PM   #2
chuckster57
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Welcome to the forum

Contrary to what you may have read, sail switch failure is rare. Itís most often foreign debris that makes it stick. At any rate :


https://rvpartsexpress.com/product/d...-with-bracket/


https://parts.unitedrv.com/products/...nt=Catch%20All

Iím sure there are more places, google is your friend.
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Old 01-21-2021, 06:37 PM   #3
Spshg
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Thx, we've had to pull the furnace out and clean the switch twice in the last 3 months...figured it might be handy to have one on hand. Thank you!
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Old 01-21-2021, 07:22 PM   #4
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If you've had to pull the sail switch and clean it that much, I'd first look at the cutout in the metal wall where the switch is mounted to see if there may be a bend or a shard of metal that catches dirt/dust causing the switch to bind. Possibly file the edges of the cutout opening just to make sure it's smooth.

Then, if the switch is binding that often from foreign "stuff" on the switch, I'd look at the return air pathway. I'd suspect that there is a "pocket of construction debris or other debris" that is "fueling the issue"....

As a comparison, we have/had until recently a GWP, who sheds terribly, sleeps directly in front of the furnace return air intake and in 6+ years of owning this trailer, we've never had a "fouled sail switch".....
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Old 01-21-2021, 08:52 PM   #5
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[QUOTE=chuckster57;430495]Welcome to the forum

Contrary to what you may have read, sail switch failure is rare. Itís most often foreign debris that makes it stick. At any rate :


https://rvpartsexpress.com/product/d...-with-bracket/


Thanks for this -I'm adding a small heat vent to the bathroom to push some warm air in there, it's an icebox in the winter. I was about to make one myself now I don't need to... thanks again. Couldn't find one elsewhere.

https://rvpartsexpress.com/product/a...adapter-36688/
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Old 01-22-2021, 06:43 AM   #6
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OP I would concur with the statements above. I've never had a sail switch failure - maybe I'm lucky. Had the last trailer 6 years and this one almost 1 and it has never been an issue (knock on wood). We also have a puppy that sheds and although we don't fulltime we did spend 7 months in it last year so we use it quite a bit.
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Old 01-22-2021, 07:22 AM   #7
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Thx, we'll take a look. We pulled it again this morning...didn't see any kind of dust or debris....pug it back in...hit the heat ...worked once....now just kicks on and turns back off? Like a sail switch issue???
Anything u can think of?
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Old 01-22-2021, 07:37 AM   #8
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Check out this video about the switch that I made. They have redesigned the bracket because there have been many many problems with the old style. That's why you can't find them anywhere as they are on backorder.

Like others have said. It's not a problem with the actual switch, they rarely fail. It's a problem with the bracket design.

https://youtu.be/_Go-GZG_U_0
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Old 01-22-2021, 08:52 AM   #9
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Thx, going to give it a try!
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Old 01-22-2021, 11:48 AM   #10
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From the hundreds of posts I've read over the last six months or so the Dometic/Atwood furnace got a bunch of sail switches that just isn't cutting it..

A potential issue with these switches is.. once fur, lint, wood particles, etc interfere with the switch contacts being able to mate with good surface contact they begin to build up a film on the contact surfaces

Once this occurs the resistance of the circuit inline with the switch increases to the point that even if the paddle arm moves fully over to allow the contact surfaces to mate there is such a high resistance that the circuit "sees" an open and the igniter wont fire and gas valves won't open

Then you go in and remove the fur, etc and switch works for a few cycles and then it doesn't work or works intermittently

When you blow out the sail switch paddle arm area you aren't doing anything to to contact surfaces inside the switch because you cant get access without trying to take the switch body apart.

In the pic I habe added this is a small contact relay.. very much like the contacts inside your sail switch.. In the case of this relay the relay works and the contacts mate but the surface of the contacts is dirty and degrades the signal (low current 12 volts) that can pass across the contacts therefore making the switch unreliable


YMMV
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Old 01-22-2021, 07:29 PM   #11
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Quote:
Originally Posted by ChuckS View Post
From the hundreds of posts I've read over the last six months or so the Dometic/Atwood furnace got a bunch of sail switches that just isn't cutting it..

A potential issue with these switches is.. once fur, lint, wood particles, etc interfere with the switch contacts being able to mate with good surface contact they begin to build up a film on the contact surfaces

Once this occurs the resistance of the circuit inline with the switch increases to the point that even if the paddle arm moves fully over to allow the contact surfaces to mate there is such a high resistance that the circuit "sees" an open and the igniter wont fire and gas valves won't open

Then you go in and remove the fur, etc and switch works for a few cycles and then it doesn't work or works intermittently

When you blow out the sail switch paddle arm area you aren't doing anything to to contact surfaces inside the switch because you cant get access without trying to take the switch body apart.

In the pic I habe added this is a small contact relay.. very much like the contacts inside your sail switch.. In the case of this relay the relay works and the contacts mate but the surface of the contacts is dirty and degrades the signal (low current 12 volts) that can pass across the contacts therefore making the switch unreliable


YMMV
Excellent info, thanks for the insight. I'm keeping this in the back of my mind for future reference. I figure it's when, not if, this happens to us.
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Old 01-23-2021, 07:10 AM   #12
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Jus this morning I read another 15 posts on various groups (not Keystone RVs) with same issue with Dometic Atwood furnace on late model units failing to work..

Symptoms.. blower comes on, no ignition sound and no light..

5 were on brand new RVs 2021 units... Jayco, Grand Design...
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Old 01-30-2021, 08:12 AM   #13
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We did this and it worked for about 5 days...just enough time to get the new switch! Thank you!
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