Daikin Mini Split Error Code P3: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
Summarize with ChatGPTSummarize with ClaudeSummarize with Perplexity Add as Preferred Source on Google
Error Code
P3
Brand
Daikin
Product Type
mini_split
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code P3 on your Daikin mini split indicates a problem with the electrical box temperature sensor. This sensor monitors the temperature inside the electrical box to prevent overheating. When it fails or detects abnormal temperatures, the system stops to protect components. This guide will help you diagnose and fix the issue safely.
Ad

Tools You'll Need

How to Fix Error Code P3

  1. Turn Off Power and Inspect the Outdoor Unit

    Always disconnect power before opening the electrical box. High voltage components can cause injury or death.

  2. Check Sensor Resistance with a Multimeter

  3. Test the Sensor Harness and Connections

  4. Replace the Faulty Sensor

    Ensure the replacement sensor matches the original specifications to avoid further issues.

  5. Reset the System and Test

Parts You May Need

Electrical box temperature sensor (thermistor)
Check Price on Amazon
Electrical box temperature sensor (thermistor)
Check Price on Amazon
Electrical box temperature sensor (thermistor)
Check Price on Amazon
Electrical box temperature sensor (thermistor)
Check Price on Amazon
Ad

When to Call a Professional

If the sensor tests good and wiring is intact, but the error persists, the control board may be faulty. Also call a technician if you are uncomfortable working with electrical components or if the unit is under warranty.

Frequently Asked Questions

Can I continue using my Daikin mini split with error P3?
No. Error P3 indicates a sensor fault that can lead to overheating. Continued use may damage internal components. It's best to fix the issue promptly.
What causes the electrical box temperature sensor to fail?
Common causes include age, electrical surges, overheating, or physical damage. Contaminants like dust or moisture can also affect the sensor.
How much does it cost to replace a Daikin electrical box sensor?
The sensor itself typically costs $10-30. Professional repair including labor may range from $100-250. DIY can save on labor costs.
Is error P3 the same as code P3 on other brands?
No. Error codes vary by brand. Always refer to your Daikin manual. P3 on Daikin specifically relates to the electrical box temperature sensor.
Can a dirty condenser cause error P3?
While not a direct cause, poor airflow can lead to overheating inside the electrical box, potentially triggering the sensor. Clean the condenser coils regularly.

Related Error Codes