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Why won't our heater heat the pool when the filter is on filter. it only works when it is on recirculate

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Your heater should operate when water is being drawn from the pool through the filter, through the heater and back to the pool.

It will not heat if you are on back wash or if your pump is off.

The heater must have water flowing through it to operate. Think of it like this ... the heater myst be cooled, the cooling water is from the pool. No cooling water, no heat!

Have I answered your question?

Thanks for your interest in

Posted on Jun 04, 2010


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