When these bearings rust, they begin to grind loudly.
There are two bearings that ensure a smooth rotation of the rotor. They can be removed easily with a stiff brush. Inspect the pipes and the impeller surfaces for any deposits. 
Cut off your power, close valves on each side of the pump, and remove the wet end cover plate to inspect the impeller. Calcium or lime deposits can build up and create noise. Open the lock nut until you hear air hissing, then tighten up again as water begins to leak. This usually happens if you recently drained the spa. Pull out the cartridge filter to see if flow improves and the circulation pump is doing better. Follow the circ pump plumbing, and look for any kinks in the hose. Check that your power is on, the breaker or GFCI test button are not tripped, all valves are in the open position. If there is no action coming from your circulation pump, see if your control panel is giving you an error code, typically a FLO or OH error when dealing with a dead pump. #Coleman hot tub error codes how to
How to Troubleshoot Your Hot Tub Circulation Pump When your hot tub pump is dead… While there are many reasons as to why your circulation pump has failed on you, we’re happy to provide you with some tips that will help troubleshoot the issue. While these pumps are known to last 5-10 years, at some point your pump is going to see problems that need some instant attention- unless you enjoy non-chemically treated spawater, which we hope you don’t! Seeing foam in your hot tub could be a sign that your pump is not working correctly.
Hot tub circulation pumps are low-flow pumps that constantly circulate in water as slowly as possible to provide your spa a continued filter, heat and chemically treated water.
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