F5
RCA
Control Board Relay or Watchdog Failure
RCA oven displays F5 and may not start or may shut off unexpectedly.
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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 (EOC), Internal control board logic fault, Power surge damage to control, Loose neutral or line connection to control board
How to Fix / Troubleshooting
Safety first: Disconnect power at the breaker before removing any panels.
- Power cycle: Turn the breaker OFF for 10 minutes, then back ON. If F5 reappears immediately, suspect the control board.
- Inspect wiring: Remove the rear control panel cover. Check the main power connections to the EOC (L1, L2, N). Tighten any loose screws and look for discoloration or melted insulation.
- Check for surge damage: Look for burn marks or bulging components on the EOC. If present, the board must be replaced.
- Relay test (advanced): With power disconnected, you can check continuity across relay contacts if you have the wiring diagram and experience. A relay stuck open or closed will cause F5 in many designs.
- Replace EOC: If wiring is sound and F5 persists, replace the electronic oven control board with the correct RCA part.
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Repair Difficulty
Hard
4/5
Required Part
Electronic Oven Control Board
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