F2
Tristar
Temperature Sensor Out of Range
Microwave shows F2 and may stop mid-cycle; keypad may still respond.
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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
Shorted or open cavity thermistor, Loose sensor wiring, Sensor mounted incorrectly against cavity wall, Control PCB sensor input failure
How to Fix / Troubleshooting
Safety: Unplug the microwave before accessing internal components.
Steps to address F2:
- 1. Allow cooling: If F2 appears after long cooking sessions, let the unit cool and then test again. If F2 appears even when cold, the sensor is likely faulty.
- 2. Locate thermistor: Remove the cabinet and find the thermistor on the cavity wall or top.
- 3. Check mounting: Ensure the sensor is properly attached and making good thermal contact with the cavity surface as designed.
- 4. Test resistance: Disconnect the thermistor and measure resistance at room temperature. Compare to Tristar specifications. Replace if open, shorted, or far out of range.
- 5. Inspect wiring and board: If the thermistor is good, check wiring continuity to the control board. If wiring is intact, the control PCB may be defective.
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Repair Difficulty
Hard
4/5
Required Part
Cavity Thermistor
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