Mitsubishi Mini-Split Error Code F3: How to Fix It

Q: What does error code F3 mean on a Mitsubishi mini-split?

Error F3 indicates the outdoor unit's 63L pressure switch has opened (tripped). This safety switch shuts down the compressor when refrigerant pressure is too high or too low.

Q: Can I fix Mitsubishi F3 error myself?

Basic fixes like cleaning filters and coils are DIY-friendly. Testing the pressure switch requires a multimeter. If refrigerant issues are suspected, professional help is needed.

Q: How do I reset a Mitsubishi mini-split after F3?

Turn off the system at the thermostat and disconnect power at the breaker. Wait 5 minutes, then restore power and turn the system on. The error should clear if the underlying issue is resolved.

Q: Will cleaning the outdoor unit fix error F3?

Yes, if the error was caused by high pressure due to dirty condenser coils, cleaning them may resolve the issue.

Q: How much does it cost to fix Mitsubishi F3 error?

If it's just cleaning, it's free. If a pressure switch needs replacement, expect $100–$200 for parts and labor. Refrigerant repairs cost $200–$500 depending on the issue.

Abstract

Your Mitsubishi mini-split is showing error code F3, which means the outdoor unit's 63L pressure switch (low-pressure or high-pressure switch) has tripped or is faulty. This typically occurs due to refrigerant issues, a blocked air filter, or dirty condenser coils. Follow these steps to safely diagnose and fix it.