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热水器主板开关电源输出电压不稳定，屏幕闪烁不工作，维修实例
燃气热水器显示屏闪烁不工作，主板电压不稳定波动大，维修接上假负载，搞懂原理常规操作，轻松解决
燃气热水器不启动，没有热水，常见故障维修合集67/113
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