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海尔热水器显示故障代码F5，维修不能生搬硬套，搞懂原理才是关键
海尔燃气热水器显示故障代码F5，客户自己更换风压开关故障依旧。维修不能生搬硬套，懂原理才是维修电器的关键
燃气热水器不启动，没有热水，常见故障维修合集31/113
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