Get your pool heater back in action with this replacement high limit switch! Specifically designed for Pentair Sta-Rite MasterTemp and Max-E-Therm pool and spa heaters, this 135°F sensor detects when water temperature exceeds safe levels and automatically opens the heat exchanger outlet to prevent overheating. Direct replacement for part numbers 42001-0063S, 42001-0064S, HMXHLI2932, HAXHLI1930, and STA-151-6255 - always double check your existing part number before ordering. Compatible with all MasterTemp models and Max-E-Therm models including SR200, SR333, and SR400. Installation takes just a few minutes and can save you from expensive repair bills or pool store markups. The right size connector fits perfectly in the existing hole, making this a straightforward DIY repair for most pool owners. When your heater stops working or shows error codes, this high limit switch is often the culprit - especially if it's been triggered multiple times or has simply worn out over time. Keep one on hand so fun in the sun doesn't get interrupted by heater issues. Funmit stands behind their products with reliable customer service, so you can shop with confidence knowing help is available if needed. A simple replacement that can have your heater firing up again quickly and safely!
Free 30-day returns 
Free 30-day returns
