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Old 04-18-2019, 10:10 AM   #1
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furnace sail switch

Our new 19’ furnace is great, very quiet and heats well.....except when it doesn’t. It has a microswitch which senses when the fan is pushing air. The switch is there to prevent the furnace from firing if the battery is too low to run the fan at the correct speed. Unfortunately, the switch will not close when fluff collects in it. I’ve had to open the outside access port 3 times to clean it out since we bought it last November. Apparently it happens often enough that Escape made a youtube video showing how to clean it.
Since we never let the batteries get low, I thought I’d be clever and jump the leads to keep the switch closed. Doesn’t work. So thought I’d be more clever and remove the switch, tape it closed, cover the hole in the fan cowling. Doesn’t work.
Oh well....to me it’s worth the trouble since the furnace is so quiet compared to any RV We’ve had before.
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Old 04-18-2019, 11:09 AM   #2
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The switch has to be in the N/O position when the furnace starts it cycle
Then there is a timer which allows the fan to run and the N/O sail switch to close . When the sail switch closes the firing cycle starts . At the end of the cycle the sail switch must return to its’ normal position and the N/0 contacts must open in order to allow you to start the next cycle . Your furnace is performing correctly , you cannot splice the wires together and bypass the switch .
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Old 04-18-2019, 11:17 AM   #3
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Dpiano...You are just lucky you can get to it via the new outside hatch design.
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Old 04-19-2019, 07:02 AM   #4
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If you call Dometic Customer service, 800-544-4881, have your furnace serial number in hand, from the sticker on the furnace blower housing.

Explain to them the issue, they will send you a replacement switch at no cost to you.

It helps to know which switch you have, one has about a 1/2 inch wide by 2 3/4 long sail, the second has a square pad about 1 inch at the end of the sail arm.
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Old 04-19-2019, 07:39 AM   #5
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Dometic’s furnishing of a free sail switch does little to solve the real issue .
This is a design flaw and throwing parts at it just pushes the problem down the road just past the warranty period .
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Old 04-19-2019, 10:34 AM   #6
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Quote:
Originally Posted by steve dunham View Post
Dometic’s furnishing of a free sail switch does little to solve the real issue .
This is a design flaw and throwing parts at it just pushes the problem down the road just past the warranty period .
I fully agree, but until there is a better furnace option, and you are willing to shell out the cash on your own, you have to live with what you have.
I'll take the free switch now as the only consolation I can get.
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Old 04-19-2019, 10:57 AM   #7
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I fully agree, but until there is a better furnace option, and you are willing to shell out the cash on your own, you have to live with what you have.
I'll take the free switch now as the only consolation I can get.
I fully agree with you . My furnace is non operable at this moment
I would gladly pay the cost for a redesigned sail switch that would solve the problem
Having to take the time and effort to repeatedly replace the sail switch and the unreliability factor just doesn’t make sense to me .
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Old 04-21-2019, 12:48 PM   #8
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cover for dail switcg

Thanks for all your comments on the sail switch.
It is a poor design for sure. In our case the switch itself is not defective, it just collects enough fuzz to keep the switch from activating.
This morning it occured to me to pull the swich (again), and install a cloth teabag around the offending area, leaving the sail outside the bag and cutting slots for the wire contacts. A goofy fix but better than pulling the switch every time it clogs up. I still plan to get another switch ffrom Dometic. Now that I know the furnace won’t run without it, I’d rather have a spare.
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Old 04-21-2019, 01:40 PM   #9
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There was also the carbon air filter mod for the intake, which should help mitigate dust bunnies.

It seems like this problem only seems to be affecting newer furnaces. I wonder why.
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Old 04-21-2019, 01:59 PM   #10
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and the newer style is about 2 feet off the floor area, so where are the dust bunnies coming from?
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