F30 error, oven may not start or may stop mid-cycle, often on models with multiple cavities.

Safety first: Disconnect power before working on the appliance.

• Identify affected cavity: Determine which oven cavity triggers F30 by testing each one separately.
• Test secondary sensor: Access the sensor in the affected cavity and measure its resistance. Replace if out of specification.
• Check interconnect harness: Inspect the wiring between the main and secondary control boards for damage or loose connectors.
• Replace secondary board: If sensors and wiring are good, the secondary control board may be defective and require replacement.

Warning: Multi-cavity ovens can be complex; label all connectors before removal.