Why can't refrigerants be added?

There are generally two reasons:

The first reason is that your air conditioning compressor is not running. In this case, you need a professional to check. It may be a circuit problem or a mechanical failure.

The second reason is that your filling pipe does not Jack the ejector pin in the feeding interface of the air-conditioning external machine, that is to say, the refrigerant cylinder is not really connected with the external machine, so we can reconnect the filling pipe according to our method.

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