Garrygoeson since you stated that you re not getting a good return to the pool your most likely getting insufficient water flow through the heat exchanger and this is why you are getting water sw open fault code. You will need to check everything in the pool related to water flow. Right i know there is some kind of regulator for lack of a better word and not sure if that is related to this but i had problems with it on my last heater and the pool people removed it.
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