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Old 01.03.2019, 06:26
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Re: High frequency noise in apartment

How long did you leave the fridge unplugged?

I can sometimes hear the fluid expansion in my fridge. It's a high frequency hiss, more like white noise than a pure tone.

The cooling cycle will still work as long as there's sufficient pressure difference between the high and low side of the system, so if you only turned the fridge off for a moment (and if the fridge is indeed the source of your noise), then you may be hearing the gas in the expansion valve. Try leaving it unplugged for 20-30 min.

Another possibility might be if you have low voltage lighting in the kitchen: if the lights are driven by a solid state invertor, and that is located behind the fridge, then that might be the source of your noise.
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