Daikin Mini Split Error Code J6: How to Fix It
Medium 30-60 minutes Medium Severity
Verified June 2026
- Error Code
- J6
- Brand
- Daikin
- Product Type
- mini_split
- Severity
- Medium
- DIY Difficulty
- Medium
- Estimated Fix Time
- 30-60 minutes
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Tools You'll Need
- Screwdriver set (Phillips)
- Digital multimeter
- Needle-nose pliers (optional)
How to Fix Error Code J6
-
Safety First – Power Off the Unit
Electric shock hazard. Always disconnect power before servicing. -
Locate the Heat Exchanger Pipe Thermistor
-
Visually Inspect the Thermistor and Wiring
-
Test the Thermistor with a Multimeter
Use a digital multimeter rated for electronics. Do not touch live circuits. -
Test the Wiring Harness for Shorts
-
Replace the Faulty Thermistor
Use an exact replacement part to ensure correct temperature readings. -
Restore Power and Test the Unit
Parts You May Need
Daikin heat exchanger pipe thermistor (10k ohm NTC)
Check Price on Amazon
Daikin heat exchanger pipe thermistor (10k ohm NTC)
Check Price on Amazon
Daikin heat exchanger pipe thermistor (10k ohm NTC)
Check Price on Amazon
Daikin heat exchanger pipe thermistor (10k ohm NTC)
Check Price on Amazon
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When to Call a Professional
If replacing the thermistor does not clear error J6, or if you suspect a problem with the main control board, contact a certified HVAC technician. Boards contain high-voltage components and require specialist diagnosis.Frequently Asked Questions
What does error J6 mean on a Daikin mini split?
Error J6 indicates a short circuit in the heat exchanger pipe thermistor. This sensor monitors refrigerant pipe temperature; a short can cause improper cooling/heating and trigger the error.
Can I use a generic thermistor to replace the Daikin one?
Yes, if it is a 10k ohm NTC thermistor with the same connector and proper mounting. However, it's safer to use an OEM Daikin replacement to ensure accurate readings and avoid future issues.
How do I test the thermistor on a Daikin mini split?
Disconnect the thermistor from the control board and measure resistance with a multimeter. At room temperature (77°F/25°C), a good thermistor reads about 10k-15k ohms. A reading near 0 ohms means a short.
Will error J6 clear itself?
No. The error will persist until the short is repaired. Turning the unit off and on will not clear it; you must fix or replace the thermistor.
Should I call a technician for error J6?
If you are comfortable using a multimeter and working with electronics, you can try replacing the thermistor yourself. If the error returns or you're unsure, call a professional HVAC technician.