Clean the strainer basket on your pump and clean your filter. If this does not help you will need to check your impeller expecally if your basket has any cracks in it. Also if you have a by-pass valve between the inlet and outlet pipes going to the heater that should be 80-90% closed. Hope this helps, good luck.
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Clean the strainer basket on your pump and clean your filter. If this does not help you will need to check your impeller expecally if your basket has any cracks in it. Also if you have a by-pass valve between the inlet and outlet pipes going to the heater that should be 80-90% closed. Hope this helps, good luck.