Daikin Air Conditioner Error U8
⚡ Quick Answer: The Daikin air conditioner U8 error indicates a communication issue between the main and sub remote controls or indoor/outdoor units, leading to opera... ✅ DIY Fixable
What Does Error U8 Mean?
The Daikin air conditioner U8 error indicates a communication issue between the main and sub remote controls or indoor/outdoor units, leading to operation cessation. This error often presents with unusual buzzing sounds, and the unit fails to cool effectively. It can occur during normal operation or after a settings change, disrupting the air conditioning functionality.
Common Symptoms:
- Unit stops operating when code appears
- Error displayed on remote or unit
- Occurs during normal operation or after settings change
Possible Causes
- Remote control communication misconfiguration (main/sub) (medium)
- Communication failure between control units (medium)
- External interference/noise affecting communication (low)
How to Fix Error U8
DIY Fix Check and correct remote control settings
- Verify if unit uses multiple remotes and check main vs sub remote status (e.g., ensure primary remote is set as main)
- Follow specific remote instructions to set correct main/sub role (e.g., long-press designated buttons to toggle)
DIY Fix Power cycle the system
- Turn off the air conditioner and disconnect power (breaker or plug)
- Wait ~1 minute
- Restore power and attempt restart
Technician Only Inspect and resolve communication wiring and modules
- Check wiring between indoor and outdoor units for continuity and proper connection
- Inspect remote control communication lines and connectors
- Test communication modules for faults using service tools
Parts needed: communication wiring, remote controller PCB, control modules
Technician Only Service remote controllers and control boards
- Test and replace faulty remote controls if defective
- Inspect and replace any failing indoor control board if responsible for communication errors
Parts needed: remote control(s), indoor unit control board
- If error persists after remotes configuration and power cycling
- If error is accompanied by other faults (noise, tripped breakers, failure to power on)
Technical Specifications
| wattage | 2000W |
|---|---|
| component | Compressor |
| resistance | 5-10 ohms |
| part_number | DAIKIN 4E-1000-00 |
| voltage_rating | 230V AC |
Common Questions
What does U8 error mean on daikin air conditioner?
U8 error indicates a communication failure between the main and sub remote controls or units, causing the unit to stop operating.
Can I fix daikin air conditioner U8 error myself?
Yes, check remote settings and power cycle the unit. Ensure the primary remote is correctly configured.
How much does it cost to fix U8 error?
Repair costs range from ¥5,000 to ¥25,000+, depending on parts and labor required.
When should I call a technician for U8?
Call a technician if the error persists after adjusting remotes or if accompanied by other faults like noise or power issues.
Sources & References
- What is a U8 fault? – Daikin NZ (community)
Data last verified: 2026-07-01
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