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Old 11-14-2021, 07:46 PM   #1
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Brand: Thor Motor Coach
State: Oregon
Posts: 2
THOR #25372
Furnace

Have a Dometic DFMD30141 and it will fire, but after that it will not re-ignite and it gives me a airflow/limit switch fault. If I reset it on the switch on the furnace it will re-ignite. Sail switch is clean and my RV not has 4000 miles on it. The other thing is it appears to be doing it less often, meaning when I first tried it before our last camping trip it wouldnít re-ignite unless I hit the off/reset switch. Now it seems to re-ignite a few times but it eventually gives the same error code. Any ideas? I did buy a new control board and igniter (figured having spare parts couldnít hurt just in case) Thanks in advance.

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Old 11-14-2021, 08:48 PM   #2
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Well it seems to be working now. Only thing I can figure is loose connection on sail or limit switch.
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Old 11-14-2021, 10:34 PM   #3
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Model: ACE 27.1
State: Florida
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Originally Posted by Campinalaskan View Post
Well it seems to be working now. Only thing I can figure is loose connection on sail or limit switch.
Or wet control board.
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Old 11-15-2021, 12:04 AM   #4
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Brand: Thor Motor Coach
Model: 2011 FW Hurricane 33T
State: England
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THOR #16471
Could it actually have low airflow?? The manual says it requires min. three 4" outlets with a good inlet size. Do all yours have good airflow as too little and the sail switch will shut it down. Maybe check for a kinked duct too.
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Old 11-24-2021, 03:33 PM   #5
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Mine was doing this when I didnít open the propane tank valve enough. Started turning it all the way open and havenít had a problem since. Maybe not your issue but worth checking.
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