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Old 05-02-2021, 08:42 AM   #1
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Cougar 30rls

Hello, I have a 2020 Cougar 30rls 1/2 ton 5th wheel.
My dometic furnace keeps cutting in and out and running for 3 min or so each time while the flame stays on for 30 seconds or so during the cycle. I have an in-command system in my unit. I spoke to the dealer and brought it in. They changed the high limit switch and said it was good to go. I am now i. It full time for the summer and i am having the same problems. On the initial strat up, it will get the unit to temp and run for 5 min to go up the 5 degrees or so it needs but after that it cycles every 3 min or so. Last night at 130 am i got frustrated and watched the in-command tstat temp and it was 63 when furnace cam on. Tstat was set for 65. After 30 sec the tstat read 65 and furnace shut down. Then temp read 63 again after 3 min and furnace came on and shut down within 30 sec and tstat read 65. So now i know it is not the high limit.
So my question is does anyone else have this issue and if so have you been successful in getting it fixed?
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Old 05-03-2021, 12:45 PM   #2
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Warm furnace air getting to t-stat thru wall/hole in wall where t-stat wires run

To test.....remove t-stat from wall ---let it dangle
Turn furnace on......feel warm air coming out of hole in wall?
Does furnace still cycle?
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Old 05-04-2021, 12:25 PM   #3
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I spoke with Dometic and they were super helpful. They said that their furnace board and the in-command system have a gateway issue. Dometic has since upgraded their boards to rectify the issue. I am waiting for my new board to arrive and test it. I hope this solves the issue.
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Old 05-04-2021, 02:08 PM   #4
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Excellent^^^^
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