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Pentair Master Temp 400 - got an HLS error light on the back of the gel touch circuit board of the heater control panel. This video shows the removal and disassembly of the Sta-Rite manifold attached to the side of the boiler. I ended up replacing the Manifold Bypass Valve instead of the suspected HLS (High Limit Switch) to clear the error.
Part number of Manifold Bypass Valve is 42001-0014
Part number of the HLS (High Limit Switch) is 42001-0063