What is the reason for a household booster pump making noise even when no water is being used?
2 Answers
Household booster pumps may produce noise even when no water is being used due to issues with the pressure control system or leaks in the pump's outlet pipe. Issues with the pressure control system: If the pump reaches the controlled pressure immediately upon operation and then stops working, this 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 go into standby mode again. This repeated cycle results in the on-and-off noise phenomenon. Replacing the one-way check valve with a high-quality one can resolve this issue. In fact, 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 can also cause the on-and-off noise, similar to the principle of a leaking check valve. Both scenarios occur because the water pressure in the pump chamber drops, prompting the pump to restart and replenish the pressure. 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. However, the pressure drops again due to the leak, forcing the pump to restart and replenish the pressure. This repeated cycle results in the on-and-off noise phenomenon.
My booster pump keeps buzzing even when no water is running, likely due to a faulty pressure switch causing continuous operation. Another possibility is air trapped inside the pump, creating an airlock. Last time I opened it, I found severely worn bearings and excessive motor vibration with a piercing noise. Another scenario could be debris clogging the intake pipe, preventing the impeller from rotating properly and causing loud straining noises, or unstable power supply making the motor speed fluctuate with abnormal sounds. I recommend first turning off the power and opening faucets to release air, then checking if the intake filter screen is clogged. If that doesn't work, professional disassembly is needed to inspect the motor and bearings.
