Types of hot water heating systems vary, so if you are unsure of the proper maintenance of your system, it's a good idea to hire a service person to teach you. With periodic care, these systems should operate virtually problem-free. When problems do occur, there are a few things you can handle yourself.

With a steam system, hammering noises may occur if the radiator isn't sloped slightly. Place small shims beneath one end to slope the radiator toward the outflow.

If the inlet valve leaks, the culprit is usually a worn valve stem packing. Repairing this involves draining water in the system until it drops below the valve and then dismantling the valve and replacing the packing (this is very similar to a faucet). If you don't know how to drain water from the system, call a plumber or radiant heating service person.

If the convectors are cold:
1) Check the power at the master switch, circuit breaker, or fuse.
2) Be sure the boiler is receiving fuel—that the fuel inlet valve is open.
3) Check the thermostat.
4) Bleed the air from convectors by opening each air valve with a wrench until water squirts out (catch the water in a bucket or bowl). Be ready for hot water.

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