A/C fan runs when heater is on

[Pylelr]

I have a 2017 Coachman Pursuit 30 FW. Bought it new. Last March, while visiitng AZ, the A/C fan started running whenever I turned the thermistat to heat. In the summer, I didn't notice a problem. This fall, I figured that the thermostat was bad and I switched the bedroom stat with the living room stat ( 2 systems. Bedroom is A/C only. LR is A/C and heat. Same stat, though.) The problem remained. Can't find any schematics. I can solve the problem by turning off the A/C breaker. Anyone had this problem and what did you do to fix it?

[WDW]

Set your thermostat to automatic and not low or high. Otherwise it could be miswired.

[Old-Biscuit]

YEP^^^
Fan control on thermostat is for A/C Unit fan
In Auto it runs/stops with A/C
In Manual (Hi/Lo) it will come on when furnace runs

Idea is to help circulate 'warm' air
All it does it move cold air

AUTO Mode

[Pylelr]

I'll give that a try on my trip this week. Winterized this last week. Glad I did. Supposed to go below freezing by Noon tomorrow and stay untl Thursday morning. It will warm up on Thursday before we leave for our trip but it will still be cold enough to need that heater.

[Pylelr]

That was the problem. Fan was set to Hi. Bc it is digital, I didn't even realize there was a auto setting. Learn something new everyday and you will grow old more slowly. Thanks again.