Daikin Error Code P4
Inverter heat sink sensor fault
Error Code Summary
| Brand | Daikin |
| Error Code | P4 |
| Meaning | Inverter heat sink sensor fault |
| Cause | Heat sink thermistor failure |
| Recommended Action | Replace heat sink temperature sensor |
How to Fix Daikin Error P4
- 1
Power Cycle the Unit
Turn off the unit at the breaker, wait 5 minutes, then restore power. Some errors auto-clear after a restart.
- 2
Identify the Issue
Error P4 means: Inverter heat sink sensor fault. The most common cause is: Heat sink thermistor failure.
- 3
Take Corrective Action
Replace heat sink temperature sensor
- 4
Test the System
After completing repairs, run the system and monitor for the error code. If it recurs, the issue may require professional diagnosis.
Safety Notice
Always disconnect power before performing any electrical work. If you're not a certified HVAC technician, contact a qualified professional for repairs involving refrigerant, electrical components, or compressor work.
Frequently Asked Questions
What does Daikin error code P4 mean?
Daikin error code P4 indicates: Inverter heat sink sensor fault. This is typically caused by: Heat sink thermistor failure.
How do I fix Daikin error code P4?
To fix Daikin error code P4: Replace heat sink temperature sensor. If the error persists after these steps, contact a qualified HVAC technician.
Is Daikin error code P4 serious?
Error code P4 (Inverter heat sink sensor fault) should be addressed promptly to prevent further damage to your Daikin system. Always turn off the unit if you notice unusual sounds, smells, or continued malfunction.