AC turns on with furnace

[clotus]

So here is a head-scratcher that I discovered on my 3-year old 5er:

When on shore power and I turn my furnace on the AC also turns on. The AC does not have a heat strip. I would imagine the problem has been like that since new because we always use space heaters instead of the furnace when on shore power. Welp one day we forgot the space heaters and bam the AC fan turned on with the furnace.

Is this normal? I remedied the issue by simply flipping the AC breaker. Thoughts on how to fix?

[clotus]

Thanks guys. I will have to look into it. The thermostat is a two button scroll system and in my opinion..... pretty weak.

This place rocks. Happy camping!

[shepstone]

Heat pump

[Turn_Key]

Mine will do the same thing, depending on how I set the thermostat. Has to do with reducing humidity in the trailer, I believe. Don't recall how I set the thermostat to avoid having the AC coming on but know that I can do this. Check your Owner's Manual and it should tell you how to set it.

PS: I believe setting fan on "Auto" is the correct answer but not sure without looking.

Happy Camping!

[Me_Again]

The new Dometic T-stat's are one of the most frustrating gadgets ever installed in a RV. Operational course is three semesters for three years.
101,102,103,201,202,203,301,302 and 303.

Follow the advice of the posters above.

Chris

[Earl_E]

Same answer as others. Make sure fan is on auto, not low of high.

[azdryheat]

Mine came on once. The thermostat was set to AUTO and the a/c and furnace came on at the same time. Now I put it on COOL for a/c and HEAT for furnace and haven't had any issues.

[Chad_Heiser]

What the previous posters said. Set the AC fan to Auto and it will not come on with the heater/furnace. If the AC fan is set to low or high it will come on when the furnace is on.

[MFL]

Fan setting on auto...no AC fan when on heat. The AC fan will help distribute heat when fan set to low/high, but not needed, IMO.

Jerry

[old_idaho_guy]

Make sure your fan setting is in auto