Mitsubishi Mini Split Error Code F8: How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
F8
Brand
Mitsubishi
Product Type
mini_split
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code F8 on a Mitsubishi mini split indicates a current sensor abnormality. This means the system has detected an issue with the current sensor circuit, which monitors electrical flow to protect the unit. The error can be caused by a faulty sensor, wiring problems, or a malfunctioning control board.
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Tools You'll Need

How to Fix Error Code F8

  1. Safety First: Power Off

    Always disconnect power before working on electrical components to avoid shock hazard.

  2. Inspect Wiring Connections

  3. Test the Current Sensor

    Only perform electrical tests if you are comfortable with using a multimeter. Otherwise, call a professional.

  4. Check the Control Board

    Control board replacement requires expertise and static precautions. Consider professional help.

  5. Replace Faulty Part(s)

    Ensure replacement parts match your unit's specifications exactly.

Parts You May Need

Current sensor (CT coil)
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Control board (main PCB)
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Current sensor (CT coil)
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Control board (main PCB)
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Current sensor (CT coil)
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Control board (main PCB)
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Current sensor (CT coil)
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Control board (main PCB)
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When to Call a Professional

If you are not comfortable working with electrical components, or if the error persists after checking wiring and replacing the sensor, call a licensed HVAC technician. The control board replacement is complex and may require programming by a professional.

Frequently Asked Questions

Can I still use my Mitsubishi mini split with error code F8?
No, you should not use the unit. The current sensor is a safety component, and operating the system with this error could cause damage or safety hazards. Turn off the system and troubleshoot.
How much does it cost to fix error code F8?
DIY repair costs $20-$100 for a sensor or $100-$300 for a control board. Professional repair costs $200-$600 including labor and parts.
Is error code F8 common on Mitsubishi mini splits?
It is less common than errors like E6 or F4, but it can occur, especially in older units or after power surges. Proper installation and surge protection can reduce risk.
Can a dirty outdoor unit cause error code F8?
No, this error is strictly electrical. However, dirt and debris can cause other issues. Keep your unit clean for overall health.
Do I need to replace the current sensor or the control board?
Start by testing the current sensor. If it fails, replace it. If it tests good, the control board is likely the problem. Always double-check wiring first.

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