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海尔燃气热水器显示故障代码F9，风机运转不工作，直接换它就行了
海尔燃气热水器显示故障代码F9，风机运转不点火，这种问题排出燃气泄漏，直接换它就行了
燃气热水器不启动，没有热水，常见故障维修合集57/113
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