Norcold 2110 not cooling

[bsblindab]

Freezer works fine but fridge had been getting warmer and warmer. Did the diagnostics and got the Ac switch closed. Is that meaning it’s in defrost cycle. Is that a easy
And inexpensive fix

[rohrmann]

What trailer is this fridge in?

[bsblindab]

2011 Montana 3665RE

[rohrmann]

Then it’s a 1210 Norcold fridge. Assuming the cooling unit is still ok, you might check the thermistor that is on the cooling fins, that it is still attached properly. I had to replace ours due to the metal clip had corroded so it wasn’t firmly attached.