Water gurgling when TADO valve is opening

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My TADO radiator valve in bedroom create water gurgling whenever it is opening to gain heat. It is very annoyed during sleeping time when temperature is below 18 celcius (my TADO threshold is 18 celcius). Is it normal ? If not, how could I fix it ?

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  • armsinit
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    Water noise in a radiator is normally trapped air. It may just be as simple as bleeding your radiator.