Question about Pool & Spa
It is very hard to trll what is going on the way you describe it. It sounds like you have nothing at low speed on the pump but when you kick it up to high speed you get a cycling on and off of the heater.
You can try your pressure switch to see if it has a problem.
With the heater and pump off you will find the pre sw on your water manifold on the side of the heater. You will need to remove the side panels from the heater they are above and below the pipes coming into the heater. The pre sw will be a mushroom shaped piece that screws in to the manifold with two wires comeing out of it. It will take a small wrench (I think 7/16") unscrew this and make sure their is no rust or calcium build-up under it in the water chamber. If their is clear with a screw driver or the like and start the pump for a second to flush this out. (Careful or you will get wet) screw switch back in and run to check. If you find no problem here than it may be in the switch itself. If you bridg the sw with a jumper wire and it starts this is your problem, but you have to ck the other stuff first. Or you may be spending money on a pre sw for nothing. Do Not Just Jump Switch and Leave It At That!!!! This could ruin your heater at least or burn down your house. Of course if the filter, pump or pump baskets are dirty this will be the problem. But you say you checked those. Good luck and I hope this helped.
Posted on Nov 21, 2009
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Posted on Jan 02, 2017
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