中文
含义
长虹空调检测到室内风机电机转速反馈信号异常，显示屏显示 E3 错误代码。E3 表示室内风机未按设定速度运转或主板未收到正常的风机速度反馈脉冲。风机是空调空气循环的核心部件，此故障会导致制冷或制热效果严重下降，甚至触发系统保护停机。
常见原因
- 室内风机电机本身损坏（绕组烧毁、轴承卡死或转子扫膛）。
- 风机电机内部霍尔传感器故障，无法产生正常的速度反馈信号。
- 风机启动电容容量衰减或击穿（适用于交流电机机型），导致电机启动困难或转速不足。
- 室内机主板风机驱动电路（如可控硅或 MOSFET 驱动级）损坏，无法向电机正常供电。
- 风机风轮被异物卡住或贯流风叶积尘过重导致转动阻力过大。
- 室内机主板与风机电机之间的反馈信号连接线断开或接触不良。
自助排查
- 断开空调电源，等待 3 分钟后重新通电开机，尝试在不同风速档位（低风、中风、高风）下运行，观察故障是否仍出现。
- 用手拨动室内机出风口处的贯流风轮，检查是否转动顺畅——如有明显阻力或异响，可能有异物卡住或轴承缺油。
- 打开室内机前面板，目视检查风轮叶片之间是否有异物堵塞（如纸片、标签等），如有请小心取出。
- 听辨风机运转时是否有”嗡嗡”声但风轮不转——如果有，可能是启动电容失效或电机绕组烧毁。
- 室内风机维修涉及电机拆卸和电路检测，请勿自行拆修。请联系长虹空调售后服务，由专业技师使用万用表和示波器检测电机供电电压和反馈脉冲信号，判断是电机故障还是主板故障，并进行相应更换。
English
Meaning
The Changhong air conditioner has detected an abnormal indoor fan motor speed feedback signal, displaying the E3 error code. E3 indicates the indoor fan is not running at the set speed or the main board is not receiving normal fan speed feedback pulses. The fan is the core component for air circulation — this fault will cause a significant drop in cooling or heating performance and may even trigger system protection shutdown.
Common Causes
- The indoor fan motor itself is damaged (winding burnout, bearing seizure, or rotor rubbing against the stator).
- The Hall effect sensor inside the fan motor has failed and cannot generate normal speed feedback signals.
- The fan startup capacitor has lost capacitance or broken down (for AC motor models), causing difficulty starting or insufficient speed.
- The fan drive circuit on the indoor unit main board (such as the TRIAC or MOSFET driver stage) is damaged and cannot supply normal power to the motor.
- The fan blower wheel is jammed by foreign objects or the cross-flow fan blades are excessively caked with dust, causing excessive rotational resistance.
- The feedback signal wiring between the indoor unit main board and the fan motor is disconnected or has poor contact.
Self-Check Steps
- Disconnect the AC from power, wait 3 minutes, then reconnect and start. Try operating at different fan speed settings (low, medium, high) and observe whether the fault still appears.
- Manually spin the cross-flow fan wheel at the indoor unit air outlet and check whether it rotates smoothly — noticeable resistance or abnormal noise may indicate a foreign object jam or bearing lubrication issues.
- Open the indoor unit front panel and visually inspect between the fan blades for foreign objects (paper, labels, etc.). If found, carefully remove them.
- Listen for a “humming” sound from the fan motor while the blower wheel is not spinning — if present, the startup capacitor may have failed or the motor windings may be burned out.
- Indoor fan motor repair involves motor disassembly and circuit diagnostics. Do not attempt DIY repair. Contact Changhong AC after-sales service for a professional technician to use a multimeter and oscilloscope to test motor supply voltage and feedback pulse signals, determine whether the fault is the motor or the main board, and perform the appropriate replacement.