Air conditioning "fault" also has the illusion that the sound does not affect the use

In the blink of an eye, the air-conditioned use season, many friends are ready to move home air conditioning, intend to enjoy the first time in the summer. However, in the near future, many of my friends reacted and said that there will be some abnormal phenomena in the recent air-conditioning test machine. Is the air conditioner malfunctioning? Is it necessary to find after-sales?

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