Today, we’re repairing a Yamada 389-17 commercial water dispenser that has a cooling failure issue. The customer reported that the dispenser keeps running but never cools, even when hot water is off and only cold water is activated.
After plugging in, the current only shows 0.2A, which is clearly too low (normal should be around 0.4A). We began a step-by-step inspection:
🔧 Repair Process Overview:
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Initial Current Test: Detected only 0.2A (too low for cooling)
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Open the Back Cover: Found the cooling fan is not working
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Circuit Board Inspection: Discovered 2 swollen capacitors
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LCR Meter Test: Both capacitors show abnormal values – confirmed defective
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Replace Capacitors & Fan: Installed new capacitors and replaced the fan to ensure proper 12V output
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Dust Cleaning: Cleaned the aluminum cooling fins to improve heat dissipation
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Final Test: Current back to normal at 0.495A, fan running
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Cold Water Test: Starting temp 26.4°C; expected to drop within an hour
✅ Conclusion
The root cause of the cooling problem was swollen capacitors on the circuit board, which cut off the 12V power supply to the Peltier cooling module and fan. After replacing them, the Yamada 389-17 dispenser is now cooling properly.
【维修教学】Yamada 389-17 饮水机无法制冷？风扇不转+电容鼓包快速修复！
今天我们接手一台 Yamada 389-17饮水机维修，客户反映设备无法制冷，即使关闭热水、只开启冷水功能，插电后电流只有 0.2A，明显低于正常水平（应为0.4A）。
我们详细检查后发现：
✅ 电路板上两颗电容鼓包
✅ 风扇完全不转动
✅ 制冷系统未启动
🔧 维修流程如下：
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测量电流确认故障（仅 0.2A）
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拆开后盖检查风扇是否工作
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检测电容使用LCR表测试两颗鼓包电容，结果数值严重偏离，确认损坏
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更换电容与风扇，确保12V供电恢复
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清理散热铝片灰尘，提升制冷效率
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重新测试电流恢复到正常值约 0.495A
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初步降温测试：冷水温度为26.4°C，预计1小时后会显著下降
✅ 故障总结：
这台Yamada 389-17 饮水机无法制冷的根本原因是电路板电容鼓包损坏，导致12V电源中断，风扇与制冷片无法启动。