dometic furnace problem

[01 mixson]

I have a 2021 jayco seneca 37 k having problems with dometic dfmd35111, when i purchased, furnace ran once worked great next time the blower would come on, would ignite for 3-5 seconds & shut off, this will continue for about a 1/2 hour or so then furnace runs fine all night long, next time went to use it same thing, ohm the sail switch it is ok, manually operate sail switch still the same, any ideas ? thanks

[J&EC]

Did you ever get resolution to this issue. I am having the same issue on the same model furnace

I would appreciate any information you ma have
Thanks
Earl

[Parrott]

Originally Posted by J&EC

Did you ever get resolution to this issue. I am having the same issue on the same model furnace

I would appreciate any information you ma have
Thanks
Earl

These are normally symptoms of a wet control board. Could be several others too but the control board after lighting a few times will dry out and work. Does your furnace have an access cover on the outside?

[J&EC]

Yes sir it does, it operates after starting and stopping about 3 or 4 times. I have looked for moisture and have found none. This has gone on for two seasons now.

[J&EC]

It does the 3 to 4 times start each and every time we use it all night long. The last time was in New Mexico where they haven’t seen rain for months.

[01 mixson]

Originally Posted by J&EC

Did you ever get resolution to this issue. I am having the same issue on the same model furnace

I would appreciate any information you ma have
Thanks
Earl

I replaced the board with a dinosaur board, sail switch, flame sensor, igniter, thermal sensor, had a badly kinked supply hose under fridge, added a section of hose to fix the kink, replaced regulator, by passed camper propane supply with a different tank and line, none of these worked, finally i adjusted the flame sensor to what the specs were for the igniter, cause i couldn't find specs for it, that kind of cured the problem, previously it would cycle about half hour turning off and on, now 2 times max then runs all night with no issues, good luck hope this helps.

[Big1]

Replace your sail switch, ask me how I know I order mines off of Amazon.

[Big1]

https://www.amazon.com/Dometic-33082...s%2C243&sr=8-5

Take out the sail switch it could be clogged, hair and dust can form around the sail inside.

[J&EC]

I will do that…thanks for the Amazon link. Have a great Memorial Day, remember all who gave all.

[J&EC]

Thanks mixson, do you happen to remember what the spec was for the igniter, or perhaps where you found that.

Have a great Memorial Day, remember all who gave all.

[Big1]

Thank you sir, I was in for twenty-eight years, every one have a great Memorial Day.

[01 mixson]

Originally Posted by J&EC

Thanks mixson, do you happen to remember what the spec was for the igniter, or perhaps where you found that.

Have a great Memorial Day, remember all who gave all.

That was awhile ago i don't remember probably wrote it down somewhere, i do remember what ever the igniter spec was, may have 1/8" that is what i made the flame sensor, hope that helps

[J&EC]

I will do a bit of research and then tackle it, thank you for your help.

We are off to Colorado, hopefully we won’t need the furnace. ��