LP Furnace/AC question

[Jlb27537]

Hello Group,

2014 3150RL.
Zone one = rear A/C (no heat pump, no heat strips) LP furnace.
Zone two = factory installed A/C
CCC2 thermostat

When we picked it up @ dealership we turned the furnace on, heard it run, heat came out vents, we turned it off. Only left heater on for maybe a couple of minutes. Not used since. A/C works properly both zones.

Now 2 months later, turn on LP furnace, no furnace operation, but the fan in the rear A/C runs. Diagnosed as bad control board in zone one. Board replaced. Dip switch on original board #8 on.

Turn on furnace, furnace works as it should. But after a short delay the rear A/C fan comes on while the furnace is running. Furnace cycles off, so does A/C fan.

If you are wondering why we are using the furnace in August, we are @ 9,400' and it was 32 degrees this morning and the fireplace needed a bit of help.

We now have the furnace working with the installation of a new control board for zone one, but the A/C fan issues continues, so I have to think it is not board related. On A/C operation, everything is normal.

SO, the question is: should the rear A/C fan run during furnace operation?

Thanks Jim

 

[DevilDog-TC]

No, the rear A/C fan should not run during furnace operation. Maybe Ozz can help.

 

[Carl n Susan]

Congrats on the new Montana! Your "problem" is apparently a "feature" which many members have discovered. Set the fan to "Auto" as described in these postings.

http://www.montanaowners.com/forums/showthread.php?t=52244&SearchTerms=furnace,fan,AC
http://www.montanaowners.com/forums/showthread.php?t=44561&SearchTerms=furnace,fan,AC
http://www.montanaowners.com/forums/showthread.php?t=41872&SearchTerms=furnace,fan,AC

 

[Jlb27537]

Well Shucky Darn...........

I'll give it a test tomorrow morning. I have "again" read the instructions. I see no mention of this "feature".

I wonder how much money in warranty claims this "feature" has cost them.

Carl, Thanks for the links....

Thanks Jim

 

[Ozz]

Carl is on the ball. Jim, I agree about the false claims and needless parts changing. You would think they would address this in the dealer show and tell.