Pump makes a loud rattling or grinding noise from the wet end; flow may be reduced.

Safety First: Turn OFF power and close suction and return valves before disassembly.

• Open the pump: Remove the bolts securing the motor to the pump housing and separate the wet end.
• Inspect impeller: Check for stones, screws, or other debris lodged in the impeller. Remove debris and examine vanes for cracks or missing pieces.
• Check impeller tightness: Ensure the impeller is firmly threaded onto the motor shaft. Tighten by hand (usually reverse thread) per Rheem instructions.
• Inspect diffuser: Look for wear or warping that allows the impeller to rub. Replace the diffuser if damaged.
• Reassemble and test: Reassemble the pump, prime, and run. If noise persists, further inspection of the volute or motor shaft may be needed.