Yamada NWD-389-21-P Water Dispenser Repair | Fixing Cooling System Issues
Today, we received a service request to repair a Yamada NWD-389-21-P water dispenser. The customer reported that this hot and cold water dispenser was not cooling properly. After a thorough inspection, we found that the issue was caused by a faulty Peltier cooling module (thermoelectric cooling chip).
Yamada NWD-389-21-P 饮水机维修 | 制冷问题维修与维护
今天，我们接到客户的维修请求，需要修理一台 Yamada NWD-389-21-P 饮水机。客户反映这台冷热饮水机无法正常制冷，我们详细检查后发现问题出在半导体制冷片（Peltier 片）。
Issue Diagnosis: Water Dispenser Not Cooling
To verify the problem, we took a small cup of water from the cold water tap and used an infrared thermometer to measure the temperature. The reading was 34°C, which is the same as room temperature, indicating that the water dispenser cooling system was malfunctioning.
We removed the water filters, opened the back panel, and directly inspected the cooling assembly (Peltier cooling module + cooling fan).
- Using a clamp meter, we measured the DC current and found that it was 0.20A—which is only the fan’s current—indicating that the Peltier module was not functioning.
- We disconnected the cooling module terminals and measured its resistance. The reading was 23Ω, confirming that the cooling module was damaged and needed replacement.
故障检测：饮水机无法制冷
首先，我们取一小杯冷水开关的水，使用温度枪测量水温，显示34°C，这与常温水温度相近，说明饮水机制冷系统出现故障。
我们拆下滤芯，然后打开饮水机后盖，可以直接看到制冷总成（Peltier 制冷片+散热风扇）。
- 我们使用钳形电流表测量直流电流，结果显示 0.20A，这仅仅是风扇的电流，说明制冷片并未启动。
- 进一步测量制冷片端子的电阻，发现其阻值为 23Ω，这意味着制冷片已经损坏，必须更换。
Repair Process: Replacing the Peltier Cooling Module and Fan
What is a Peltier cooling module?
The thermoelectric Peltier module has two sides:
✅ Cold side (faces the water tank)—responsible for lowering the water temperature.
✅ Hot side (faces the cooling fan)—dissipates heat to maintain system efficiency.
To restore optimal cooling, we decided to replace both the Peltier cooling module and the cooling fan, as an aging fan can also lead to poor cooling performance.
Steps to replace the components:
- Remove the faulty Peltier module and test it using a multimeter in continuity mode—the old module had no continuity, confirming failure.
- Install a new Peltier cooling module, measuring 0.0Ω resistance with continuity, indicating it was in good condition.
- Replace the cooling fan to ensure proper heat dissipation.
- Reconnect all wiring and measure the new current. The DC current reading was now 3.11A, meaning the cooling system was functioning properly.
维修过程：更换制冷片与风扇
什么是制冷片？
制冷片（Peltier 半导体制冷片）有两面：
✅ 冷端（贴近冷水桶）——负责降低饮水机水温
✅ 热端（靠近风扇）——散热以维持系统稳定
为了保证制冷效果，我们决定同时更换制冷片和风扇，因为风扇老化也会影响饮水机制冷性能。
更换步骤如下：
- 拆除旧制冷片，使用万用表蜂鸣档检测，旧制冷片无蜂鸣声，确认损坏。
- 安装新制冷片，测量新制冷片的电阻为 0.0Ω，并有蜂鸣声，代表是正常的。
- 更换风扇，以确保散热效果。
- 重新连接所有电路，再次测量电流，直流电流达到 3.11A，说明制冷片已经正常工作。
Testing & Results: Restoring the Cooling Function
- Reassembled the dispenser, including the back panel and water filters.
- Measured the exhaust air temperature at the fan outlet—it was 37.7°C, indicating that the cooling system was working.
- Cold water test: After pouring another cup of water, the temperature was 32.8°C, showing that the dispenser was gradually cooling. It typically takes about one hour to reach the optimal cold water temperature.
- Final power test: The cooling system AC current was 0.29A, confirming normal operation.
测试与结果：饮水机恢复制冷功能
- 安装回后盖和滤芯，并通电测试。
- 风扇口温度测试：测量风扇排出的热风温度为 37.7°C，表明制冷系统已经开始工作。
- 冷水测试：再次取一杯水，测量水温为 32.8°C，表明饮水机正在逐步降温，通常需要约1小时才能达到正常的低温水温度。
- 总电流检测：制冷总成的交流电流为 0.29A，符合正常运行范围。
Conclusion: Water Dispenser Cooling Issue Resolved
In this repair, we replaced two critical components—the Peltier cooling module and the cooling fan, successfully restoring the cooling function of the Yamada NWD-389-21-P water dispenser. If your water dispenser is not cooling properly, the issue may be due to a faulty Peltier module or cooling fan. Regular maintenance and timely replacement of these components are recommended.
结论：饮水机制冷问题已解决
本次维修过程中，我们更换了两样关键配件——制冷片和风扇，成功恢复了 Yamada NWD-389-21-P 饮水机的制冷功能。如果您的饮水机制冷效果变差或完全不制冷，可能是制冷片或风扇故障，建议定期检查并及时更换。
💡 Maintenance Tips:
🔹 Clean the cooling fan regularly to prevent dust buildup that can block airflow.
🔹 Monitor current and temperature changes to detect early signs of cooling failure.
🔹 Replace the Peltier cooling module every 2-3 years to maintain optimal cooling performance.
If you are experiencing water dispenser cooling issues, feel free to contact us for professional water dispenser repair services! 💧🔧
💡 温馨提示：
🔹 定期清理风扇，避免灰尘堵塞影响散热。
🔹 检查电流与温度变化，确保制冷系统正常运行。
🔹 制冷片寿命有限，建议每 2-3 年更换一次，以保持最佳制冷效果。
如果您的饮水机制冷系统出现问题，欢迎联系我们进行专业维修！💧🔧