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We are in central heating city gas. Some radiators do not work properly: they heat up but not down. Is this a purge problem? Moreover, when purging, should we start with the ground floor or the top floor?

First check the operation of your faucets (especially if they are thermostatic), then that of the circulation pump (switch to higher speed if it is adjustable). But you will probably solve the problem by purging your radiators: start the lower ones, make up the pressure with water intake as the purge - it is therefore useful to be two to do it. If that does not help, it means that your radiator is "bogged down". You can add a "defogger" in the circuit (eg from GEB). If it still does not work, rinse after the heating season.

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