Hitachi Error Code 29
Outdoor air thermistor error
Error Code Summary
| Brand | Hitachi |
| Error Code | 29 |
| Meaning | Outdoor air thermistor error |
| Cause | Ambient temperature sensor fault |
| Recommended Action | Check/replace outdoor air thermistor |
How to Fix Hitachi Error 29
- 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 29 means: Outdoor air thermistor error. The most common cause is: Ambient temperature sensor fault.
- 3
Take Corrective Action
Check/replace outdoor air thermistor
- 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 Hitachi error code 29 mean?
Hitachi error code 29 indicates: Outdoor air thermistor error. This is typically caused by: Ambient temperature sensor fault.
How do I fix Hitachi error code 29?
To fix Hitachi error code 29: Check/replace outdoor air thermistor. If the error persists after these steps, contact a qualified HVAC technician.
Is Hitachi error code 29 serious?
Error code 29 (Outdoor air thermistor error) should be addressed promptly to prevent further damage to your Hitachi system. Always turn off the unit if you notice unusual sounds, smells, or continued malfunction.