Display shows Er CO; control panel may be unresponsive, lights may work but settings cannot be changed.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Loose or damaged communication cable, Oxidized connectors, Failed display PCB, Faulty main PCB communication circuit

Safety: Disconnect power before removing control panels.

Er CO indicates a communication failure between boards.

Access display: Remove the front control panel carefully.
Inspect cable: Check the ribbon or harness for damage and reseat both ends.
Check for moisture: Look for signs of water ingress on the display PCB; replace if corroded.
Inspect main PCB: From the rear, verify the communication connector is secure.

If Er CO persists, either the display PCB or main PCB is defective. Board replacement is typically a professional repair.

Hard 4/5

Display PCB or Main Control Board

Check Price on Amazon

We may earn a commission from links on this page.