Turn the heating off, let the radiator cool, then slowly open the bleed valve with the right key or screwdriver. Viessmann’s guide says to keep a towel and jug underneath first so escaping water does not make a mess.
When air stops hissing and water starts to come out, close it and check the system pressure afterward. If the boiler pressure drops too low after bleeding several radiators, you may need to top the system back up.
The basic logic is simple: air trapped in the radiator blocks hot water from circulating evenly, so the top stays cool while the bottom may heat normally. Bleeding removes that pocket of air and lets the system do its job again.
If the radiator still stays cold after bleeding, the issue may be a closed valve, sludge, or a bigger system imbalance rather than trapped air alone.
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