mini split indoor unit with no cracking noise?

7 years ago

last modified: 7 years ago

My current mini split (12K BTU Chigo brand) makes cracking noises (see video) when the compressor starts/stops or the mode changes. For example, I have a home automation to automatically increase the set-temperature and switch from cool to heat mode at 4am. The cracking noise at that time often wakes me up.

First I thought it was a defect, but the manual says that it is expected because the plastic contracts/expands and or the refrigerant flow can cause cracking noise.

Questions:

1) Is there a workaround? Removing the face-plate and the 2 small airflow direction motors helped a bit. I am considering removing the air deflector plastic piece as well, but it is connected to the condensate drainage pipe which I wasn't able to disconnect. If I could confirm that the noise is definitely from the plastic, I would even consider replacing all plastic in the unit with custom wood/metal pieces.

2) Does someone own a mini-split that doesn't make the cracking/clicking/popping sounds like in the above video when the compressor turns on/off or changes modes, especially from cool to heat? From the discussion here, it seems like many people experience similar problems but there are some that don't. In this thread, I am hoping that some people can confirm that their mini split does not make such cracking noises when turning on/off or changing mode from cooling to heating, and provide some information about their brand/model. I would probably then move the current unit to the living/work room and install the quiet model in the bedroom.

Thanks,

Abhishek

my mini split's indoor unit makes similar noises

my mini split's indoor unit does not make any noise, except the usual white noise of a fan

my mini split's indoor unit makes some other kind of noise (please explain in comments?)

Featured Answer

roarah

7 years ago

Mitsubishi MSZ-gl18na

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Comments (9)

roarah
7 years ago
My split only makes minimal white noise on high fan settings.
Abhishek Anand thanked roarah
Abhishek Anand
Original Author
7 years ago
Thanks for your response. Glad to hear that. Can you please tell me your make and model number?
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User
7 years ago
I probably am of no help b/c I don't have model numbers handy. All I can tell you is that I have 2 Mitsubishi units and they are both whisper quiet.

I remember reading in their owners manual that crackling noises are considered normal. I only use them for cooling, not heating - but they make almost no noise in any of my cooling operations. They beep when I first turn them on, the fan runs on high for a brief bit, and then they settle into virtually silent operation. I really am very happy with them.
Abhishek Anand thanked User
Abhishek Anand
Original Author
7 years ago
Thanks @patriceny. Would you mind trying the heat mode just once, for maybe about 1 minute, and reporting back whether there was any noise?
K Jones
6 years ago
Ours is new and it wakes me up all night. We have only used it for cooling. It pops and cracks so loud that it’s miserable. Any help resolving the issue would greatly be appreciated! We have a Fujitsu Halcyon.
Joe
6 years ago
I have two Mr. Cool units and they both make that same noise on both cooling and heating functions.
Joe
6 years ago
I just did a little research and looks like : I need to replace a sleeve bearing on the squirrel cage fan under warranty. Hope this helps everyone..
Peter D
5 years ago
Got two indoor Mitsubishi MSZ-HR25VF hooked to a multi split. Brand new. They both make popping noises when cooling. Especially soon after turned on and working stronger. Very annoying. Seems to be the plastic. I am trying to get the people who installed it to try to fix it. After that, I may try on warranty.