E4 - robam Induction Cooktop

中文

含义

老板电磁灶检测到线圈盘温度传感器（NTC2）开路，E4 错误代码表示嵌在线圈盘内部的 NTC2 阻值异常偏高（通常大于 100kΩ）。NTC2 用于监测线圈盘的工作温度，防止线圈盘因长时间高功率加热导致温升过高损坏漆包线绝缘层。NTC2 开路后，控制系统无法获知线圈盘的真实温度，为安全起见停止加热输出并显示 E4。

常见原因

1. NTC2 元件本身因长期处于高温工作环境，封装材料老化导致内部引线断裂。
2. NTC2 固定在线圈盘内部，线圈盘长期工作中的热胀冷缩往复应力拉扯 NTC2 引线至断裂。
3. NTC2 引线出口处被线圈盘骨架锐边长期摩擦导致绝缘磨损后引线断开。
4. NTC2 连接线束端子接触不良或氧化，在主控板插头处形成开路。
5. 线圈盘在制造或维修过程中 NTC2 引线被拉扯过度，留下隐性损伤，使用后逐渐发展成开路。
6. 主控板上 NTC2 对应的分压电阻或信号处理通路元件损坏。

自助排查

1. 断开电磁灶电源，拔掉电源插头，等待 5 分钟后重新上电，观察 E4 是否消失。
2. 检查 NTC2 连接器是否牢固插入主控板插座。找到从线圈盘引出的 NTC2 线束（通常为两根细线），重新插拔连接器确保接触良好。
3. 使用万用表电阻档测量 NTC2 两端的阻值。室温下正常 NTC 阻值通常在 10kΩ-100kΩ 之间。若测得阻值为无穷大，说明 NTC2 开路。
4. 检查 NTC2 引线从线圈盘出口到插头之间是否有可见的断裂或绝缘破损。
5. NTC2 埋设在线圈盘内部，更换需要拆解电磁灶并涉及线圈盘拆卸，操作复杂。请联系老板售后服务由专业技师处理。

English

Meaning

The Robam induction cooktop has detected an open circuit in the coil temperature sensor (NTC2). The E4 error code indicates that the NTC2 embedded inside the induction coil assembly has an abnormally high resistance (typically over 100kΩ). NTC2 monitors the operating temperature of the coil to prevent overheating that could damage the enamel insulation of the coil windings during prolonged high-power operation. When NTC2 is open-circuited, the control system cannot determine the actual coil temperature and stops heating output for safety, displaying E4.

Common Causes

1. The NTC2 component itself has developed internal lead fractures due to prolonged exposure to high operating temperatures and aging of the封装 material.
2. NTC2 is embedded within the coil assembly, and repeated thermal expansion and contraction cycles create stress that eventually fractures the NTC2 leads.
3. The NTC2 leads have been abraded by sharp edges at the exit point of the coil bobbin over time, eventually severing the wire.
4. Poor contact or oxidation at the NTC2 connector terminals, creating an open circuit at the main board header.
5. The NTC2 leads were over-stretched during coil manufacturing or repair, leaving latent damage that progresses to an open circuit during normal use.
6. The voltage divider resistor or signal conditioning components for the NTC2 channel on the main control board have failed.

Self-Check Steps

1. Disconnect the cooktop from power, unplug it, wait 5 minutes, then reconnect and power on to see if E4 clears.
2. Check whether the NTC2 connector is firmly inserted into the main board socket. Locate the NTC2 wire pair (usually two thin wires emerging from the coil assembly) and re-seat the connector for good contact.
3. Use a multimeter in resistance mode to measure across the NTC2 leads. At room temperature, normal NTC resistance is typically between 10kΩ and 100kΩ. An infinite reading indicates NTC2 is open-circuited.
4. Inspect the NTC2 leads for visible breaks or insulation damage along the path from the coil exit to the connector.
5. NTC2 is embedded inside the coil assembly, and replacement requires disassembling the cooktop and removing the coil — a complex operation. Contact Robam after-sales service for professional handling.