Daikin Mini Split Error Code CA: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
CA
Brand
Daikin
Product Type
mini_split
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code CA on your Daikin mini split indicates a short circuit in the discharge air thermistor. This sensor monitors the temperature of the air leaving the indoor unit, and a short can cause the system to malfunction or shut down. Follow these steps to diagnose and resolve the issue.
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Tools You'll Need

How to Fix Error Code CA

  1. Turn Off Power

    Always turn off power before servicing the unit.

  2. Locate the Discharge Air Thermistor

  3. Visually Inspect the Thermistor

  4. Test the Thermistor with a Multimeter

    Be careful not to touch the probes together while testing.

  5. Replace the Thermistor if Faulty

    Ensure the replacement part matches the original specifications.

  6. Reset the System

  7. Check for Loose Connections or Board Issues

    Working on the control board requires advanced electronics knowledge.

Parts You May Need

Discharge air thermistor
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Discharge air thermistor
Check Price on Amazon
Discharge air thermistor
Check Price on Amazon
Discharge air thermistor
Check Price on Amazon
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When to Call a Professional

If you are not comfortable working with electrical components, or if the thermistor tests good and the error persists (possible control board failure), contact a licensed HVAC technician.

Frequently Asked Questions

What does Daikin error code CA mean?
Error code CA indicates a short circuit in the discharge air thermistor of your Daikin mini split. This sensor is located in the indoor unit and measures the air temperature after passing over the evaporator coil.
Can I still use my Daikin mini split with error CA?
It is not recommended. The error may cause the system to run inefficiently or shut down to prevent damage. Continuing to use it could lead to further issues.
How much does it cost to fix error code CA?
If the thermistor is faulty, a replacement part costs between $10 and $30. If you hire a technician, labor can add $100-$200. Control board replacement is more expensive, often $200-$500.
Can a dirty air filter cause error code CA?
A dirty air filter typically does not directly cause a thermistor short, but it can cause airflow issues that may trigger related error codes. Always clean filters regularly.
Where is the discharge air thermistor located on a Daikin mini split?
It is usually located near the blower wheel or on the coil housing inside the indoor unit. Remove the front panel and air filter to access it.

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