Multi-select problem: How does the next paragraph end?

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 you're working on any mechanical components, consult your manufacturer's instructions for what to do. Use the correct amount of water to avoid splashing over the work surface.; -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.; -The simplest way to repressurize a boiler is by turning off the heat. Keeping the boiler shut off is the only way to repressurize it and to have it cool down again at the same time.; -By getting your boiler running again at least 30 minutes before you bring it back to a normal temperature, you can quickly repressurize it. Understand why isolating a boiler can be hazardous.;
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.