Make sure your controller has a freeze protection cycle.
It will have the pool pump come on and stay circulating when the temps go below a certain point.
My controller freeze protection cycle default level is 38 degrees. The reason being the temp sensor is in a protected area and the real outside temp may in fact be lower, start at a little higher temp sensor wise.
The pump will run continuously until the temps get back above the set level.
If you are not doing this you run a significant if not certain risk of a breakage some where in the system.
btk
PS in the summer we run 7 hours a day.
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