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Old 12-10-2017, 09:32 PM   #1
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No hot air from bedroom floor vent.

2018. 3791RD
Turned the furnace on and found out that there was no air flow from bedroom floor vent. There is no evidence of a damper value.
Any ideas?
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Old 12-11-2017, 07:19 AM   #2
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Thinking maybe a section of flexible duck was not connected properly. could be at the vent,at the Y or maybe at the furnace !
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Old 12-11-2017, 07:27 AM   #3
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I would check my rig but its 19 degrees here, so I'm staying in the sticks and bricks facility. Perhaps check your thermostat and make sure it's not set on heat pump. You can also check your other ducts. If the flow from those are weak, you may have something blocking your cold air return.
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2017 Montana 3950BR
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Old 12-11-2017, 09:43 AM   #4
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Our 2017 3720 has that duct and run exposed in the ceiling of the basement. Would be easy to knock it off or damage it. I took aluminum duct tape and strengthened mine as well as ran the tape over the connection.
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Old 12-11-2017, 09:48 AM   #5
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We found one of the ducts disconnected also. In our case it was the bedroom floor. We did the same as DQDICK and reconnected it (used a few extra screws) and used the aluminum duct tape on it.
2011 3150RL
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Old 12-11-2017, 10:35 AM   #6
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Pull the back wall off in the basement and check to see if the all the flex lines are hooked up see that a lot they have real bad connections from the factory and you need to beef them up with more screws and aluminum duck tape.

Bob & Carol
Washington St
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Old 12-11-2017, 11:25 AM   #7
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In a 3700 the bedroom duct runs along the ceiling of the basement. The cost saving old world craftsmen cut the flexible duct exactly long enough to reach, when stretched tight, from the furnace to the floor duct. It constantly came loose despite screws and tape. The flex hose was replaced by a hard pipe from the duct back over the basement wall (where it went back to the flex). Now there is slop in the flex to allow movement behind the wall and a solid pipe along the ceiling of the basement to protect from damage from things stored there. The cost was around $5 for parts that are standard in HD or Lowes.

The bathroom vent had a similar problem, but as it was behind the wall, an extension of flex, with screws and tape, stopped it from coming loose
Carl (n Susan) Youngren
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Old 12-11-2017, 09:06 PM   #8
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While I had the basement wall out to insulate behind it and the ceiling of the basement areas, I noticed the flex duct from the furnace to the duct running to the bedroom was coming loose. I took Gorilla Tape and reinforced the connection about a week ago but have not been back out to the Monte to see if it has held or not. The temps have dropped significantly here so if the Gorilla Tape is going to let go in the cold it will have done it. I'm going to crank up the furnace and put some heat into the flex duct and main duct to the bedroom and see if the Gorilla truly is the best tape to use in both heat and cold. I do have the foil tape for back up if the Gorilla doesn't hold. I had three flex ducts coming off the furnace (main duct in the ceiling of the basement, one running to the bathroom floor register and one to the underbelly going to the black and gray tank). All of them were quite loose in the way of enough lengths to their destination. The one going to the underbelly for the tanks was not stuffed down into the hole in the floor so I put it in the correct place and now have heat going to the belly that I did not have prior.
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Old 12-11-2017, 10:19 PM   #9
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You just have to find the duct problem. Here is what was wrong with mine.

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