Question about Pentair Wf 6 1.5hp Whisperflo Inground Pool Pump

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Whisperflo pool pump. Pump was trying to start but motor was humming then tripping breaker. I replaced the capacitor but had exactly the same problem. As there was some sign of salt around backing plate, I replaced the mechanical seal. Still same problem. If I very gently touch the fan, the motor kicks in and runs for as long as I leave it on. I tried to turn it off for 15 minutes, then on again and it starts instantly but leaving it off overnight and then turning on again the next morning, the motor will not turn until the fan is touched again. I am at a total loss as to what to try next so any ideas would be much appreciated. Thanks

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Thank you for posting your question here on Fixya.com.


Your motor's internal starting switch is either out of alignment or broken. It is usually not a job the average do-it-yourselfer can fix but if you want to try you will need to take the pump and motor back apart only this time going further by removing the motor thru-bolts and then driving out the rotor/shaft assembly. Be careful to note the orientation of all the bearing spacers and spring(s) for reassembly. Once apart the switch will be on the endbell behind the fan.

An electric motor repair shop should be able to inspect this for you. If the motor or only the switch needs to be replaced they too should have the part or motor to get he pump back to fully operational.


If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!

Posted on Mar 28, 2011

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