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If your radiator is on but your room remains cold, a simple five-minute trick can often resolve the issue without needing a plumber. The most common cause of poor heating is trapped air in the radiator, which prevents hot water from circulating properly. To fix this, you can bleed the radiator using a special key or screwdriver. Ensure the heating is off and the radiator is cool before starting. Place a cloth and a small container under the bleed valve, then slowly open it to release trapped air until water flows steadily. If problems persist after bleeding, or if there are leaks, professional help may be necessary.