Pump noise diagnosis
Two questions, thirty seconds. Pump running at its usual speed.
1. Put your hand flat on top of the motor and press lightly. Does the noise drop?
2. What do you mostly hear?
It's vibration
The pump is fine: the surface is amplifying its movement. Level it, free it from walls and pipes, and isolate it from the ground.
This kind of noise is exactly what SOURDINE targets.
Probably the bearings
Worn bearings squeal more and more and can seize the motor. Have the pump checked soon.
Probably cavitation
The pump is starved of water. Check the water level, baskets, pump lid and valves.
Air is getting into the suction side
Find the air leak: water level, lid O-ring, suction fittings.
Probably debris
Cut the power, open the strainer and remove whatever is inside. If the noise continues, the impeller may be damaged.
Cut the power now
A motor that hums without starting can burn out. The cause is often the capacitor or a seized motor. Call a technician.
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