Any chance there's some kind of pressure relief valve that might have frozen open? Or how about a drain-back valve that opens to allow drainage when not in use? It might have frozen open, and then when the pump came on simply stayed open.
Chuck
Re: Solar freeze?
Any chance there's some kind of pressure relief valve that might have frozen open? Or how about a drain-back valve that opens to allow drainage when not in use? It might have frozen open, and then when the pump came on simply stayed open.
Chuck
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