The Baseboard Check Valve Is Squeaking

Examine the heater for leaks. Water may not be visible because it evaporates as it escapes, so check for signs of cracking around the check valve itself. Oxygen in the system often causes squeaking, squealing and other noises that indicate a problem.

Verify the area around the check valve is properly secured. Longer pipes vibrate if not bracketed, and so squeaking often results. Use a stud finder to locate a solid part of the wall closest to the check valve, and then drill a bracket into the stud with screws to prevent that section of the system from vibrating.

Use the bleeder valve to eliminate oxygen from the system once you're sure any leaks have been sealed. Turn off the system first and let it cool. Close all the shut-off valves. Attach a garden hose to the bleeder valve and run it to a bucket to prevent spilling any water. Open the bleeder valve slowly, and then close it again once all the air is out of the hose and you get a steady stream of water. Add more water into your system in accordance with your system instructions. Open the shut-off valves again, and turn the system back on.

Turn down the pump setting on the heater to slow the flow of water going by the check valve. This helps eliminate noise.