AirGradient Forum

AirGradient One v.9 making high pitched sound

#1

I have two AirGradient One v.9 units, one in the living room and one in the bedroom. The one in the bedroom has started making a very quiet high pitched sound. It’s not noticeable during the day, but at night, it’s quite audiable, and I’ve started turning the monitor off at night.

I plan to do some testing to see if I can narrow down what’s causing the sound, like swapping the units between bedroom and living room to see if it’s related to the power supply.

Any other ideas?

#2

It’s definitely not a common problem so I don’t know what causes it but you might also want to check the PM sensor if something is partially blocking its fan. Pushing in compressed air might help.

#3

@Achim_AirGradient I do have the same issue.

After a few months of use, the PM2.5 sensor fan was becoming louder. Much so, that I moved the unit further from the bed and finally unplugged it. Today I had some time to research this issue and disassembled the AirGradiant One, unscrewed the PM2.5 Sensor and (following a YT video) pried open the sensor to get the fan out.

First thing: super impressive that it was so easy to disassemble :slight_smile: You basically only need TR6 torx and a metal prying tool (I used my ifixit kit).

The fan itself was covered in dust, but nothing was blocking it and it was way less dust built up than I usually see in my laptops. I lubricated the fan using silicon oil and just by blowing you can hear the difference it made. I will assemble everything now and hope that it will stay silent for a while now.

Maybe these sensors have some quality issue regarding lubrication?
Anyway, I hope this can help others to debug and fix their noise issue.

Cheers,
Lukas

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#4

I can’t edit my previous answer just yet. However, I wanted to add that the fan noise came back after a few hours. So lubrication did not work. I’ll try using WD40 next time and if this also does not work, I’ll find a replacement fan.

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#5

Hey @Lukas

Please do contact us via the support form here: The First Professional-Grade, Affordable Air Quality Monitor and, if possible, provide a recording of the noise so we have better context. We are happy to send a replacement sensor as well!