Pentair 150F High Limit with Safety Shutoff, 71017

The Pentair 71017 is the 150F high limit switch with safety shutoff fitted to MiniMax pool heaters. It is listed for the MiniMax Plus range from 150 through 400, and for the MiniMax above ground heaters 75, 100 and 100SC.

What it does

The high limit is the heater safety that watches heat exchanger temperature and cuts the burner at 150F. It is what stands between a heater with poor flow and a damaged exchanger, so it is not a part to bypass or jumper out to get a season out of a heater.

Before you replace it

A high limit that keeps tripping is usually reporting a real problem rather than failing on its own. Low flow from a dirty filter, a closed valve, a failing pump or a partly blocked exchanger will all trip it. Check those first, and if the switch itself is open with everything else normal, this is the Pentair replacement.