furnace and vent help?

[al7601]

2008 jay feather 311 furnace only blowing heat out of 3 vents in rear of trailer where the furnace is not reaching living room area and bedroom. The hoses are all connected to the furnace which is in the rear next to the bath room and all are blowing out hot air. The vents not blowing heat out have some very minor air flow coming out not hot and nothing like the rear vents. Under the trailer is enclosed so I don't even know how to diagnose this. any help is appreciated and thank you

[vboyd]

Sounds like the feeder pipe that feeds those vents has become disconnected.

[al7601]

Originally Posted by vboyd

Sounds like the feeder pipe that feeds those vents has become disconnected.

Do you know how to trouble shoot?

[vboyd]

If the furnace vent plumbing runs under the trailer you may have no choice but to open up the underbelly. I don't know of any other way other than visual inspection.