Looking for some help. I've had a repair tech out to the house and I'm still having the same issue. Once a month I need to take the bottom pan out of the fridge ( Freezer is at the bottom ) and remove ice that has stopped the fan from blowing cold air up into the the fridge portion of the refrigerator.

What has been Checked:

I've cleaned the pee-trap on the back of the fridge.
The drain hose is clear.
The defrost heater is working because ice is forming.

Any solutions would be great.

Thanks