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Heater manufacturers said this is an "open secret" in the industry.
热水器制造商则称，这是行业里公开的秘密。
youdao
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Water heater can't fire solution: open air supply, air intake filter.
热水器打不着火的解决方法：开启气源，整理进气过滤网。
youdao
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Water heater can't fire solution: open air supply, air intake filter.
热水器打不着火的解决方法：开启气源，整理进气过滤网。
youdao