F1
Tristar
Control Board Internal Fault
Microwave displays F1 and beeps; may occur at power-up or when pressing any key.
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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 microcontroller, Damaged control PCB from surge, Shorted component on control board, Corrupted firmware
How to Fix / Troubleshooting
Safety: Unplug the microwave before removing the control panel.
Steps to address F1:
- 1. Hard reset: Unplug the unit for 10–15 minutes to fully discharge internal circuits. Plug back in and test. If F1 returns immediately, the board is likely faulty.
- 2. Check for moisture: Inspect the control panel area for signs of condensation or liquid spills. Allow to dry thoroughly if moisture is present.
- 3. Inspect wiring: Ensure all harnesses to the control PCB are secure and not pinched or damaged.
- 4. Replace control PCB: Persistent F1 errors generally require replacement of the control board. Transfer any overlay or keypad as needed. This repair is moderate difficulty and may be best performed by a technician.
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Repair Difficulty
Hard
4/5
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