Thermostat for Furnace & AC (minor problem)

[Jim-Dot]

I have a Suburban furnace & Coleman AC in my 2021 303RLS controlled by an Airxcel digital thermostat. We are winter Texans for three months and had the opportunity to use the AC a couple of days ago (before the cold snap). I set the thermostat to cold low fan and it started up. Thinking the fan was running pretty fast, I changed it to cold high fan to see the difference. The fan slowed down! It seems the high speed and low speed settings are reversed. Could it be a wire mix-up at the thermostat or something else? I don't have a thermostat manual so if it's a wire mix-up, can I change it at the thermostat? If so, how do I remove it from the wall? I don't want to force/break it. I've changed or replaced several thermostats on my homes over the past many tears but I can't see how this one removes.
Thanks all.

[Jlawles2]

Jim-Dot Jim, looking at several of the manuals online it appears the grey and green wires are backwards.

https://www.airxcel.com/DesktopModul...f/1976a376.pdf

I think the thermostat is on a set of key slots. Lift slightly and it releases. Pg 1 right side https://www.airxcel.com/docs/default...vrsn=9f9076b_6

[pengle]

If so, how do I remove it from the wall? I don't want to force/break it. I've changed or replaced several thermostats on my homes over the past many tears but I can't see how this one removes.
Thanks all.

In my 310GK the thermostat wouldn't just lift off. I took the two halves apart, from the side, and I see that GD installs them with screws, even though there are obviously key slots to use for the installation.

[Jim-Dot]

That's what it was. The two wires for the fan were reversed.

Thanks ALL.