The answer to 'boiler making noise' is that there are several common causes, including sediment buildup, worn components, or a problem with the pressure relief valve. Boiler noises can range from banging, rumbling, or whistling sounds, and they often indicate an issue that needs to be addressed.
If your boiler is making unusual noises, it's important to investigate the cause right away. Some minor issues like sediment buildup may be something you can address yourself, but more serious problems like a faulty pressure relief valve or other malfunctioning components usually require a professional HVAC technician to diagnose and repair.