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燃气热水器显示故障代码E3，什么问题？维修简单，但心中疑惑不解
海尔燃气热水器显示故障代码E3，风机或者电脑板问题，虽然师傅上门轻松修好，但心中充满疑惑，这台机器为什么会这样呢？
燃气热水器不启动，没有热水，常见故障维修合集24/113
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