Question about Pentair 1.0 Hp Whisperflo Pump

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I can run my pump on skimmer or main, but not both at same time without pump heating up and shutting down.

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I am assuming you have a three way valve in front of your pump that allows you to switch between main drain and skimmer. If so take the three way valve apart and check for any obstructions. Also the handle on the three ways are made to fit on the valve only one way. I have seen where the handle was put on the wrong way with some force. If the handle is on the wrong way and you open up the valve so you are drawing from both skimmer and main drain it is actually blocking off the port to the pump which would cause the pump to run dry and heat up.

Posted on Jan 16, 2010

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Posted on Jan 02, 2017

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Check the weir door in the skimmer. If it gets something in it to stick it in the up position you will get water trying to run into the skimmer but with the door stuck shut the water get's pulled out by the pump and can't refill the skimmer fast enough. So the pump runs out of water then the skimmer refills. The pump will catch prime and run the cycle again and again. Free up the skimmer weir door and this will fix this. Also low water will do the same thing, so be sure you have enough water in the pool.

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My pool pump will run fine once I prime the system from the top of the pump basket. Then once the timer shuts the pump off, when it trips the switch to run again there is no water in the pump and it cannot...


If you are a long way above the surface of the pool and you have a leak on the filter it could be a check valve problem.
With it competly loosing the prime it sounds more like a suction leak. This will be in the plumbing and will need a re-plumb or it could be as simple as a lid "O" ring or cracked lid.
What happens is the air get's in the tank and air will compress when under pressure. Then when the pump shut's down the air can expand again. When it does it will rush back through the system and blow the prime right out of the pump. Quite often you will see water blow out of the skimmer or just blow the skimmer lid off. I hope this helps. Good luck.

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When backwashing or rinsing the same water is used as in filtering.(skimmer and main drain) so I don't think skimmer damage is the issue. Check if the pool water is low at the skimmer after the backwash cycle, Also check to see if the skimmer weir gate (flapper) is stuck in the upright position. I would suggest 2 main checks. Fill the pool higher than usual, back wash, ensure the pool water level is 1/2 way up the skimmer level and try again. Also, if your lines are valved right, shut off the skimmer during the filter cycle and see what happens. Lastly, the gasket on your multi-port valve may be bad.

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