GE Range Error Code F027

F027 on a GE range means the oven user interface board and the oven relay board cannot establish communication with each other. These two boards need to exchange data constantly for the oven to function, and this code appears when that communication link fails. The issue can stem from a power glitch, a loose wiring connection, a damaged harness, or a faulty board.

You should avoid using the oven while F027 is active. Because the relay board and user interface board cannot communicate, oven functions may not respond correctly or may behave unpredictably. Diagnosing and resolving the fault before operating the range is the safer approach.

Pinpointing which board is at fault usually requires ruling out wiring issues first, then substitution testing one board at a time. Start by inspecting and reseating the harness connectors between both boards. If the wiring is intact and the fault persists after a reset, a technician can use substitution or diagnostic tools to determine which board has the internal failure.

A power reset is always the first step and does resolve F027 in some cases, particularly when the fault was triggered by a power surge or voltage irregularity. Disconnect the range from power for at least 30 seconds, then reapply power and see if the code returns. If the fault comes back, a deeper electrical or component issue is likely present.

If the fix is simply reseating a loose connector, there may be no parts cost at all, just the time to inspect and secure the connection. If a wiring harness needs replacement, costs typically fall in the range of $30 to $80 for the part. Board replacements are more expensive, generally ranging from $100 to $300 or more per board depending on the model, plus any applicable labor costs.