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In this case the valve was blocked inside. The work is done without turning off the heating and without emptying. The prerequisite is that you unblock the valve first as I show in the video. But this only works with Danfoss valves. With others you have to empty and replace the entire upper part. Stuffing box ☑️* https://www.amazon.de/gp/product/B001... Fitting grease☑️* https://www.amazon.de/gp/product/B007... Thermostat head☑️* https://www.amazon.de/gp/product/B003... Danfoss valve☑️* https://amzn.to/3oKmLIT Danfoss angle adapter☑️* https://amzn.to/3q6ZGAT Danfoss thermostat head chrome-plated☑️* https://amzn.to/3mAKoSe Danfoss thermostat electronic☑️* https://amzn.to/3jPZUYC Pipe socket wrench set☑️* https://amzn.to/328SucY The references marked with an asterisk (*) are so-called Commission links. If you click on such a link and purchase via this link, I will receive a commission from your purchase. The price does not change for you. All recommendations are based on my own experience. / antonio_matanovic80