E2 - robam Induction Cooktop

中文

含义

老板电磁灶检测到 IGBT 温度传感器（NTC1）开路，E2 错误代码表示控制主板读取到的 NTC1 阻值异常偏高（通常大于 100kΩ），对应检测温度极低或超出量程。NTC1 通常为贴在 IGBT 散热器上的负温度系数热敏电阻，用于实时监控 IGBT 温度以实现过热保护和功率调节。NTC1 开路后，控制系统无法获取准确的温度信息，为安全起见锁定加热输出。

常见原因

1. NTC1 元件本体因长期冷热循环导致内部焊点疲劳断裂，形成开路失效。
2. NTC1 引线插座（连接线端子）松动、氧化或脱落，导致信号线路中断。
3. NTC1 到主控板之间的连接线缆被昆虫或啮齿动物咬断，或在装配时被夹伤。
4. 主控板上 NTC 分压电路的上拉电阻虚焊或开路损坏，导致检测端电压异常。
5. 运输或安装过程中剧烈震动造成 NTC1 引线从根部断裂。
6. NTC1 引线焊接点受潮湿环境侵蚀产生电化学腐蚀断裂。

自助排查

1. 断开电磁灶电源，等待 5 分钟后重新上电启动，观察 E2 是否消失。偶发性的接触不良可能在断电复位后暂时恢复。
2. 检查电磁灶底部 NTC1 连接线插头是否牢固插入主板插座，尝试重新插拔确保接触良好。
3. 使用万用表电阻档测量 NTC1 两根引线之间的阻值：室温下（25°C）正常阻值应在 5kΩ-50kΩ 之间。若测得阻值为无穷大，则 NTC1 确已开路。
4. 检查连接线束是否有明显的物理损伤、断裂或氧化痕迹。
5. NTC1 通常位于 IGBT 散热器上，需要拆机才能触及。不建议用户自行更换，请联系老板售后服务由专业技师更换故障 NTC 传感器。

English

Meaning

The Robam induction cooktop has detected an open circuit in the IGBT temperature sensor (NTC1). The E2 error code indicates that the measured resistance of NTC1 is abnormally high (typically over 100kΩ), corresponding to an extremely low or out-of-range temperature reading. NTC1 is a negative temperature coefficient thermistor typically mounted on the IGBT heatsink, used for real-time IGBT temperature monitoring to enable over-temperature protection and power regulation. With NTC1 open-circuited, the control system cannot obtain accurate temperature data and locks the heating output for safety.

Common Causes

1. The NTC1 component itself has developed internal solder joint fatigue fractures from repeated thermal cycling, resulting in an open-circuit failure.
2. The NTC1 lead connector (terminal) is loose, oxidized, or has detached, interrupting the signal path.
3. The wiring between NTC1 and the main control board has been chewed by insects or rodents, or was pinched during assembly.
4. The pull-up resistor in the NTC voltage divider circuit on the main board has a cold solder joint or has failed open, causing an abnormal voltage reading.
5. Severe vibration during transportation or installation has broken the NTC1 leads at the root.
6. The NTC1 solder joints have suffered electrochemical corrosion fracture due to a humid environment.

Self-Check Steps

1. Disconnect the cooktop from power, wait 5 minutes, then reconnect and power on to see if E2 clears. Intermittent contact issues may temporarily resolve after a power-cycle reset.
2. Check whether the NTC1 connector at the bottom of the cooktop is firmly inserted into the main board socket. Try unplugging and re-plugging it to ensure good contact.
3. Use a multimeter in resistance mode to measure across the two NTC1 leads. At room temperature (25°C), normal resistance should be between 5kΩ and 50kΩ. If the reading shows infinite resistance (open circuit), NTC1 has failed.
4. Inspect the wiring harness for visible physical damage, breaks, or signs of oxidation.
5. NTC1 is typically located on the IGBT heatsink and requires disassembly to access. DIY replacement is not recommended — contact Robam after-sales service for a professional technician to replace the faulty NTC sensor.