空调在制热时外机砰砰响是什么原因在制热时外机砰响，然后还有漏气的声音

我也遇到了，我的是日立空调。如果接着运行一段时间后没有故障或异响就没事，如果砰砰响后还有异音发出应该立即停机检修
中文互联网上没有类似的问题，摘抄一下Google上搜到的英文回答。懒得翻译，自己看吧：
Banging Sounds
The tricky part of dealing with strange or loud sounds coming from your air conditioner is the fact that it is not necessarily a problem. Take a banging or booming sound, for instance. Because temperatures in ductwork can vary so greatly, that sound could be nothing more than a totally normal expansion and contraction of your ductwork.
However, it could also be the sound of components banging around in your AC cabinet. If this is the case, then continuing to run the system can definitely result in serious damages that are easily avoidable when you schedule prompt repairs. This variance is exactly why you should always have any such problems investigated immediately.

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