端口或者附属设备的硬件有故障。
消毒机控制系统的硬件电路由液位检测电路、双手感知电路、P87LPC767单片机、电动执行电路和一些附属电路组成；
The hardware circuit of the controlling system consists of liquid level sensing circuit, double-hand sensing circuit, SCM P87LPC767, electric execution circuit and some additional circuits.
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