Cast iron baseboard heaters – Hot water baseboard heaters are radiators attached to the lower part of your home walls that utilizes hot water to provide heat. A boiler heats the water in the main unit and then pumps it through pipes to each baseboard heater in the home. Inspect the heating system for leaks. When the water heat escapes, climate also get into it, and the presence of air bubbles, sometimes resulting in banging or gurgling sounds in the system. Repair any leaks then refill the system as needed.
Open the bleeder valve with a hex key and close it as soon as water starts to come out of it. Many systems have valves located near the high points of heaters designed to remove excess air. Wear work gloves and turn the heat off before you do this, to prevent burns. Replace expansion tank near the boiler if the heating system starts to sound like a river that runs through the house for cast iron baseboard heaters. This noise indicates a defect membrane in the expansion tank, that is to let excess water through it and does not form a proper seal. Fill the system after replacing the tank and bleed into the air.
Listen to the pump. When the pump starts to fail, it often makes a lot of noise, and leaky gaskets in the pump contributes to this problem of cast iron baseboard heaters. Turn off the shutoff valves on both sides of the pump to prevent water loss then remove the pump from the system per the instructions for your specific radiator system. Attach a new pump then reopen the shut-off valves to restore function to the system.