F1
Ultima Cosa
Internal Control Board Fault (Self-Test Failure)
F1 appears and the unit beeps continuously until unplugged.
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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
Corrupted firmware on main control PCB, Failed microcontroller, Shorted component on logic side of PCB, Liquid damage to control board
How to Fix / Troubleshooting
Safety first: Unplug the air fryer immediately if it behaves erratically.
- Power cycle: Leave unplugged for 15 minutes, then reconnect and test. If F1 returns immediately, an internal fault is likely.
- Inspect for moisture: Remove the control housing and check the main PCB for signs of moisture, corrosion, or residue. If present, gently clean with isopropyl alcohol and a soft brush, then dry thoroughly.
- Check for visible damage: Look for burnt components, cracked ICs, or bulging capacitors. Any such damage indicates the board should be replaced.
- Board replacement: Order a compatible Ultima Cosa main control PCB for your model. Transfer all connectors one by one to the new board, matching positions carefully.
Firmware-level faults are not user-repairable; replacing the control board is the standard remedy.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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