Usually that means that the heat exchange manifold is cracked. G
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heating unit 看上去还挺新的, 能修吗?还是要换新的?
-大百百-
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12/03/2017 postreply
10:42:32
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Get an HVAC person to look at it.
-borisg-
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12/03/2017 postreply
11:02:17
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好的,事关人命,应该请 LICENCED EXPERT。.谢谢,
-大百百-
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12/03/2017 postreply
11:26:13