What's Happening

Main board can't communicate with a fan or sensor.

How to Fix It

Unplug for 5 minutes. Check wire connections. Replace board or component if secure.

Frequently Asked Questions
What does PC ER mean on a KitchenAid fridge?
PC ER means a communication failure with an internal component.
Is PC ER the same as CF?
Similar but CF is the display board specifically. PC ER can be any component.
How do I fix it?
Power cycle, check wiring. If secure, a component or board needs replacement.