F5
Zline
Control Board Relay or Watchdog Failure
Oven displays F5 and may not start or may shut down mid-cycle.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed relay on electronic oven control, Internal control board fault, Voltage spikes or power surge damage, Loose control board connectors
How to Fix / Troubleshooting
Safety first: Disconnect power at the breaker before accessing the control panel.
- Step 1 – Power cycle: Turn the breaker OFF for 5–10 minutes, then back ON. If F5 clears and does not return, monitor the oven. If it returns quickly, continue.
- Step 2 – Access control board: Remove the back cover or control panel cover to expose the electronic oven control. Inspect for burnt spots, bulging capacitors, or a burnt smell.
- Step 3 – Check connections: Reseat all harness connectors going to the control board, ensuring they are fully seated and locked. Look for loose or overheated terminals.
- Step 4 – Evaluate environment: Confirm the oven is on a dedicated circuit with stable voltage. Frequent surges can damage the control.
- Step 5 – Replace control board: If visible damage is present or F5 persists after reseating connectors, replace the electronic oven control board with the correct Zline part number.
Note: Control board replacement involves handling sensitive electronics; use anti-static precautions if possible.
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Repair Difficulty
Hard
4/5
Required Part
Electronic Oven Control Board (EOC)
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