What is the reason for a household booster pump making noise even when water is not flowing?
2 Answers
The reason a household booster pump makes noise even when water is not flowing is due to issues with the pressure control system or leaks in the pump's outlet pipe. Below are the relevant explanations: Issues with the pressure control system: When the pump reaches the controlled pressure immediately upon operation and stops working, it indicates a problem with the pressure control system. Since there is no water usage in the outlet direction, the pressure quickly replenishes, causing the booster pump to enter standby mode again. This repeated cycle results in the phenomenon of intermittent noise. Replacing the one-way check valve with a high-quality one usually resolves the issue, as most cases of intermittent noise are caused by a faulty check valve. Leaks in the pump's outlet pipe: Leaks in the outlet pipe direction causing intermittent noise operate on the same principle as leaks in the check valve—both result from reduced water pressure in the pump chamber, prompting the pump to restart and repressurize. Due to minimal water flow in the outlet direction, the pressure quickly rises to the set value, causing the booster pump to shut down for pressure maintenance. Once the pressure is reached, leaks cause the water pressure to drop again, forcing the booster pump to repressurize. This repeated cycle leads to the intermittent noise phenomenon.
I've also encountered the issue of the booster pump running without water at home. This is often caused by air leakage in the pressure tank or a ruptured diaphragm, making the pump think there's insufficient pressure and causing it to start frequently, producing a buzzing sound. It's similar to how a car's water pump can create noise when the seal ages and leaks, causing unstable pressure. Other possible causes include a faulty check valve allowing water to flow back into the pipe, forcing the pump to work again, or a stuck control switch continuously supplying power, keeping it running. When I was repairing cars, a small leak could cause similar chaos. You should inspect it as soon as possible: turn off the pump's power, listen for the noise location, and check if the pressure tank sounds hollow. Delaying could lead to the pump motor overheating and burning out, just like a car's alternator failing, which would be a big hassle. I recommend regular air pressure maintenance, and if you can't handle it yourself, call a plumber immediately to prevent minor issues from becoming major problems.
