1.当热水器出现E2时，要立即关闭机器，不要乱动它，等修理师傅到。
2.排除是否是热水器水未加满，就通电加热。
3.检查是不是热水器管路接错了，例如接反了。
4.维修或者更改控制板。
5.进气口被异物堵塞，造成空气流量减小。
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