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How to repressurize a boiler
Turn off the power to the heating system.
After turning your boiler off, wait a few hours so it can cool. If you don't turn it off and allow it to cool before working on it, you could damage the system or hurt yourself.
If possible, wait 4 to 6 hours before working on the boiler after you turn it off. Reach under the boiler and pull out the tray that is concealed underneath.