Jennair Cooktop Error F21

DIY Fix Initial Power Reset and Cooldown

1. Turn off the cooktop and allow it to cool completely (if recently used).
2. Switch off the circuit breaker feeding the cooktop for at least one minute.
3. Switch the breaker back on and observe if the F21 code returns.
4. Avoid using the cooktop until you verify normal operation.

Technician Only Electrical Supply and Component Diagnosis

1. Verify correct and stable power supply frequency and voltage at the cooktop connection point.
2. Check internal power board and control board for signs of heat damage or electrical irregularities.
3. If overheating is suspected, inspect cooling pathways and confirm proper installation clearances.
4. Replace any faulty parts (e.g., control board, power circuitry) as determined by testing.

Parts needed: Control board / power circuit board, Wiring harness, Cooling components (if applicable)