Electrolux Range Error Code 21

Error code 21 on an Electrolux range signals a LIN (Local Interconnect Network) communication failure on the ESEC cooktop system. This means the cooktop's User Interface Board either cannot communicate with other control components or has detected a shorted condition on the communication bus. The cooktop may be disabled until the fault is resolved. The most common starting point is inspecting the LIN bus harness at the ESEC-UIB P8 connector.

Error code 21 typically disables the ESEC cooktop to prevent unsafe operation during a communication failure. The oven section may or may not be affected depending on your model. It is best to avoid using the cooktop until the fault is diagnosed and repaired, as operating with a compromised control communication network can be unpredictable.

If the fix is simply reseating the LIN bus harness connector, the repair may cost nothing beyond a service call fee, which typically ranges from $75 to $150. If the ESEC-UIB or Filter Circuit Board needs replacement, parts costs generally range from $100 to $300 or more depending on the specific board and model, plus labor. Getting a diagnostic visit from a technician before ordering parts is advisable to confirm which component has failed.

A knowledgeable DIYer can attempt the first diagnostic step, which involves checking that the LIN bus harness at the ESEC-UIB P8 connector is securely connected and undamaged. If the connector is seated correctly and the wiring appears intact, resolving the fault will likely require replacing the ESEC-UIB or the Filter Circuit Board, which involves working with internal range electronics. If you are not comfortable working with appliance wiring and control boards, a qualified technician is recommended.

Resetting the range by cutting power at the breaker for a few minutes may temporarily clear error code 21, but it will return if the underlying cause is not addressed. A loose connector that reseats itself during a power cycle might stay clear longer, but a shorted harness or failed board will cause the fault to reappear quickly. A reset is useful for confirming the error is persistent, but it is not a repair.