PC ER error code showing on the display.

Hello. I have attached the service manual on this unit for you. I do not see any information an a PC ER error code. In the manual I attached it lists all the error codes. Also, the main control has a light on it as well that will blink to give error codes. Check this light on the main board. Also, see if you can put the unit into diagnostic mode and run tests. You should be able to figure out the issue by doing theses different test in the service manual. Let me know.