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It could mean that the High Limit Switch has failed or is about to fail. You should call a qualified swimming pool tech to trouble shoot the that heater control component. If he should fine that it is indeed faulty - replace it. He should further check ALL the other components to make sure that they are performing to their potential or to factory specs. This service could save you $$$ in the long run. The heater is trying to tell you something ~ and that is to get it serviced soon. A failed High Limit Switch could perceivable let your heater run or fire or continue to burn even though the pump has shut off. And as you may have already found out ~ nothing works unless the pump is working or running. k

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Q: What do it mean if the laars pool heater control panel says Hi Lim SW?
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