Electrolux Range Error Code E21

E21 indicates a communication failure between the filter board and the User Interface Board (UIB). The range has detected that these two control boards are not exchanging data signals properly. This error points to a problem in the wiring harness between UIB connector P8 and filter board connector X14, or a fault in one of the boards themselves.

It is not recommended to continue using the range while E21 is active. A communication failure between control boards can result in unpredictable behavior from the appliance, including the inability to properly control heating elements. The range should be powered off until the fault is diagnosed and resolved.

Repair costs depend on which component is at fault. If only the harness needs replacement, costs are typically lower, ranging from around $50 to $150 for parts and labor. If the filter board or UIB requires replacement, parts alone can range from $100 to $350 or more, with additional labor costs on top of that depending on the service provider.

A knowledgeable DIYer can start by unplugging the range and inspecting the harness and connectors between P8 and X14 for visible damage, loose pins, or corrosion. If reseating the connectors does not clear the code, diagnosing and replacing the filter board or UIB involves working with control electronics and is best handled by a qualified technician.

Resetting the range by disconnecting power for a few minutes may temporarily clear the E21 code, but if the underlying wiring or board fault is still present, the error will return. A reset does not fix a broken harness, a loose connector, or a failed board. Proper diagnosis of the P8 to X14 communication path is needed for a permanent repair.