H31 - 松下 空调

中文

含义

电流切断保护。系统检测到运行电流异常超过预设的保护曲线，IPM（智能功率模块）或电流检测电路触发切断。区别于H16的过流保护，H31更侧重于瞬态电流冲击。

常见原因

1. 压缩机启动瞬间浪涌电流过大，超过IPM模块的耐受能力
2. IPM模块内部IGBT短路或驱动电平异常
3. 电源电压瞬间大幅波动（如电网闪变）
4. 压缩机转子位置检测异常，启动时序错误导致堵转
5. 室外机主板上电流检测电路滤波电容老化

自助排查

1. 关闭空调后等待5分钟再重启，确认是否为瞬时波动引起的保护
2. 使用万用表记录供电电压，观察是否在正常范围内稳定
3. 检查压缩机启动电容是否正常
4. 若频繁出现，可能为IPM模块或压缩机故障，需专业人员检测

English

Meaning

Current cut protection. The system detects that the operating current has exceeded the preset protection curve. The IPM (Intelligent Power Module) or current detection circuit triggers a shutdown. Unlike H16 (sustained overcurrent), H31 focuses on transient current spikes.

Common Causes

1. Excessive compressor startup surge current exceeding IPM module tolerance
2. Internal IGBT short circuit or abnormal gate drive level in the IPM module
3. Rapid large fluctuation in supply voltage (e.g. grid flicker)
4. Abnormal compressor rotor position detection, starting with incorrect commutation timing
5. Aged filter capacitor in the outdoor main board current detection circuit

Self-Check Steps

1. Turn the AC off, wait 5 minutes, then restart — rules out transient fluctuation
2. Record the supply voltage with a multimeter — check for stable operation within the rated range
3. Check the compressor start/run capacitor for normal capacitance
4. If the fault recurs frequently, the IPM module or compressor may be faulty — professional diagnosis is needed