Atwood furnace shuts off

[oldgreymayor]

I have a 2016 Sanibel 3601. The furnace shut down a month ago fan and furnace at same time. Atwood sent a 20 amp breaker because the one that came with the trailer was 15 and they thought that would solve the problem. A certified repairman installed it on the furnace. Two weeks later t shut down again without the cool down. Has anyone had this problem?

[5picker]

Is the new 20 amp breaker kicking?

[oldgreymayor]

Yes

[oldgreymayor]

The repairman is here now. He has reset the breaker twice and it still trips. I know it's a furnace, but the vents close to the furnace are extremely hot. The repairman thought so too.

[5picker]

Have him do a load test on the furnace.

[hillsdaletc]

Check all heat vents and ducts for blockage or closed vents. Sounds like the furnace is putting out heat but it is backing up into the furnace and loading the blower wheels. Normally in this situation the thermal switch should shut it down not the breaker. You may have crushed flex ducting. If the thermal cutoff is not working then the breaker will overload. Will it run ok when tested on a bench out of the unit?

[Danesville]

If it is tripping the breaker have the repairman get out his meter and check for short in furnace wiring

[CaptnJohn]

Curious to what is found. Another thread here today with Atwood problems on a 2015 and I have problems on a 2016 also. Atwood told me to use a slow burn fuse.
Surprised they sent a 20 amp as the docs on all Atwood I've seen to 34,000 BTU say use nothing higher than 15 amp fuse.
My problem is continual fuse blown. They suggested a Bussman 22715 which is a 15 amp slow burn ~~ light blue color. Almost impossible to find locally so I ordered online. They will not arrive until next week.