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09-09-2018, 03:02 PM
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#1
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Established Member
Join Date: Jul 2018
Location: Las Vegas
Posts: 26
M.O.C. #22185
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No airflow to rear furnace vents
Hey All. I have a HC 375FL which is only a few months old. I was testing the furnace and heat pump today. With the furnace on, I have good heat and airflow to the front living area and kitchen floor vents. However, I have no airflow to the bathroom and bedroom floor vents. Any ideas?
Thanks,
Kevin
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09-09-2018, 03:08 PM
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#2
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Check the rear of the furnace and see if one of the flexible ducts is loose or has fallen off. Historically a weak point with Montanas.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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09-09-2018, 03:50 PM
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#3
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Established Member
Join Date: Jul 2018
Location: Las Vegas
Posts: 26
M.O.C. #22185
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Quote:
Originally Posted by WeBeFulltime
Check the rear of the furnace and see if one of the flexible ducts is loose or has fallen off. Historically a weak point with Montanas.
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Thanks full time. Sorry for being a noob but do I remove the furnace panel on the outside of the RV to access the rear of the furnace?
Kevin
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09-09-2018, 04:24 PM
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#4
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,943
M.O.C. #20477
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Kevin,
You will need to access it by removing the panel near the convenience center in your flow through storage space.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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09-09-2018, 04:29 PM
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#5
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Established Member
Join Date: Jul 2018
Location: Las Vegas
Posts: 26
M.O.C. #22185
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Thanks.
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09-09-2018, 08:13 PM
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#6
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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Same here. I found a duct not connected to the heater box. Good quality aluminum tape will seal it and hold the duct in place.
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09-13-2018, 07:42 AM
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#7
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Established Member
Join Date: Jul 2018
Location: Las Vegas
Posts: 26
M.O.C. #22185
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Finally removed my access panel and found 5 ducts solidly connected to the furnace. I removed one of the affected ducts and found plenty of air output from the furnace. Still no air to the rear vents though. I did pull the vents and confirm the ducting is connected to the vent housing. At this point, I feel like there must be an obstruction in both ducts or the furnace just can't push that much air. I might try an cap off the shorter runs as a test.
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09-13-2018, 09:50 PM
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#8
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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There have been numerous issues with a/c vents having crushed ducting. These issues have been diagnosed with a remote camera. Harbor freight has a cheapie camera for about $70.
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09-17-2018, 07:53 AM
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#9
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Montana Fan
Join Date: Aug 2018
Location: elmvale
Posts: 105
M.O.C. #22355
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now I have the 374 hc and when I took off my back panel for access I only have 2 pipes. One to heat the compartment and one to heat upstairs. mine goes directly into the floor under furnace. there is duct running to kitchen and back of the trailer to washroom and bedroom.
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09-19-2018, 01:00 PM
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#10
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Montana Master
Join Date: Jun 2004
Location: Victor
Posts: 940
M.O.C. #1709
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Kevin, what if you take a old canister vac or shop vac and put hose on so it blows air. Take each hose off and see if it is open to the duct. Also blow from one end of duct to the other. If you have five hoses on there you maybe trying to move more air than that little furnace can move.
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09-21-2018, 07:57 AM
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#11
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Established Member
Join Date: Jul 2018
Location: Las Vegas
Posts: 26
M.O.C. #22185
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Quote:
Originally Posted by jsmitfl
Kevin, what if you take a old canister vac or shop vac and put hose on so it blows air. Take each hose off and see if it is open to the duct. Also blow from one end of duct to the other. If you have five hoses on there you maybe trying to move more air than that little furnace can move.
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Thanks that's a good idea. I will rent something from Home Depot next weekend and give it a try.
I agree it just might be too much air for the little furnace. I had a portable indoor AC unit at one time. Tried putting an extension duct and it just couldn't push that much air.
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09-23-2018, 06:10 PM
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#12
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Montana Fan
Join Date: May 2017
Location: Mid Missouri
Posts: 156
M.O.C. #19889
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The first time we tried using our furnace (6 months after purchase) we only had air flow from 2 of the 5 registers. 3 of our 4 heater ducts (read: flimsy, paper thin dryer vent hoses) were found "severed" from the factory. In our unit the bath and bedroom share a duct, the 2 kitchen and 1 rear vent each have their own ducts, although I don't understand why they cant combine those. The latter three were the ones found severed by the dealer. They did a piss poor job of repair...I plan on installing some rigid duct work over the winter. It will require removing the coroplast underbelly.
__________________
2017 Montana High Country 353RL
2017 Silverado 3500HD DRW CC LB 6.6L Duramax
B&W Companion
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09-24-2018, 05:37 AM
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#13
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Established Member
Join Date: Aug 2017
Location: Albany
Posts: 47
M.O.C. #20438
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If it’s convenient enough I would bring it back to the dealer for warranty work.
Although it is fun to learn about our rigs why spend money when you don’t have to.
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