Daikin Air Conditioner Error H9-00
⚡ Quick Answer: The Daikin Air Conditioner H9-00 error indicates a communication failure between the indoor and outdoor units, primarily due to an abnormal reading fr... ✅ DIY Fixable
What Does Error H9-00 Mean?
The Daikin Air Conditioner H9-00 error indicates a communication failure between the indoor and outdoor units, primarily due to an abnormal reading from the outdoor air thermistor. This may cause the unit to stop operation and display a blinking error on the remote or unit display. If this error persists, it may require inspection or replacement of the thermistor or related components.
Common Symptoms:
- Unit stops operation when H9 (or H9-00) is displayed
- Outdoor unit does not continue normal cooling/heating
- Error appears on remote controller or unit display
Possible Causes
- Failure or abnormal reading of the outdoor air thermistor (temperature sensor) (medium)
- Poor connection or contact at the thermistor connector (medium)
- Possible control board issue affecting thermistor signal processing (low)
How to Fix Error H9-00
DIY Fix Basic check and power reset
- Turn off the air conditioner using the remote and power switch.
- Disconnect power at breaker or unplug if safe to do so.
- Wait about 1 minute before restoring power.
- Restart the unit and check whether the H9/H9‑00 code clears.
Technician Only Inspect and repair outdoor air thermistor and connections
- Visually inspect the outdoor unit thermistor wiring and connector for damage or loose connections.
- Measure thermistor resistance versus expected values at different temperatures to confirm sensor integrity.
- Replace the outdoor air thermistor if confirmed faulty.
- Check control board input for thermistor signal and repair/replace board if necessary.
Parts needed: Outdoor air thermistor sensor, Related wiring harness/connectors, Control board (if necessary)
- Error remains after power reset
- Outdoor thermistor wiring appears damaged
- Unit exhibits additional faults besides H9 display
Technical Specifications
| wattage | N/A |
|---|---|
| component | Control Board |
| resistance | N/A |
| part_number | DAIKIN PCB-12345 |
| voltage_rating | 220V AC |
Common Questions
What does H9-00 error mean on Daikin Air Conditioner?
H9-00 indicates a communication failure due to an outdoor air thermistor fault, causing the unit to stop working.
Can I fix Daikin Air Conditioner H9-00 error myself?
Yes, try a power reset by turning off the unit and disconnecting power for a minute before restoring it.
How much does it cost to fix H9-00 error?
Repair costs range from ¥8,000 to ¥30,000+, depending on parts and service location.
When should I call a technician for H9-00?
Call a technician if the error persists after a power reset or if you notice damaged wiring.
Sources & References
- Daikin Error Code Search (general guidance) (official)
- H9 Error Code explanation (Skycon Air) (community)
Data last verified: 2026-07-01
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