中文
含义
E11表示空调变频驱动板的PFC（功率因数校正）电路出现故障。PFC电路用于提高电源功率因数、减少谐波污染并稳定直流母线电压。当PFC升压异常或IGBT管损坏时触发此代码。
常见原因
- PFC升压电感或PFC IGBT管损坏或击穿。
- PFC控制IC供电异常或外围电路元件损坏。
- 直流母线电压检测电路分压电阻变值，反馈信号异常。
- 输入电源电压过低，PFC无法正常升压工作。
- PFC散热器过热导致保护触发。
自助排查
- 关闭空调电源并断开室外机电源，等待电容放电（至少30分钟）。
- E11属于严重故障，涉及高压电路，有触电风险，不建议自行维修。
- 检查室外机供电电压是否正常（交流220V±10%）。
- 记录故障现象和空调型号后联系售后。
- 维修通常涉及更换PFC模块或整块变频板，由专业工程师操作。
English
Meaning
E11 indicates a fault in the PFC (Power Factor Correction) circuit on the A/C inverter drive board. The PFC circuit improves power factor, reduces harmonic pollution, and stabilizes DC bus voltage. When PFC boost is abnormal or the IGBT is damaged, this code triggers.
Common Causes
- The PFC boost inductor or PFC IGBT is damaged or shorted.
- Abnormal PFC control IC power supply or damaged peripheral components.
- The DC bus voltage detection divider resistors have drifted, causing abnormal feedback.
- Input power supply voltage is too low for PFC to boost normally.
- PFC heatsink overheating triggered protection.
Self-Check Steps
- Turn off A/C and disconnect outdoor unit power, wait for capacitor discharge (at least 30 minutes).
- E11 is a serious fault involving high voltage circuits with electric shock risk — do not attempt self-repair.
- Check if the outdoor unit power supply voltage is normal (AC 220V±10%).
- Record the fault symptoms and A/C model, then contact service.
- Repair typically involves replacing the PFC module or the entire inverter board — performed by a professional engineer.