HILFE – mir ist so kalt 😂

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for a potentially quicker solution: you can give the inlet tube (before the knob part) a few sharp taps with the back of a wrench or something similar – sometimes the valve gets clogged.

you can also take off the knob of the heater, and push down the pin a few times with a flat metal tool (but be more careful with this part – you can look up youtube videos on how to unblock a radiator)