Hayward CZ/HM/HM2 Thermostat w/o Knob (CHXTST1930) grasslin A motor in this class

A motor in this class is especially useful when exact frame matching and proven brand confidence are both important to the repair

Installing a fresh body O-ring can help restore the pump assembly without forcing replacement of larger body components

Confirm the pump model and part number C1-274P before ordering

pressure switch arrangement

Hayward CZ/HM/HM2 Thermostat w/o Knob (CHXTST1930) grasslin A motor in this classThis thermostat is used on compatible Hayward CZ, HM, and HM2 heater systems where temperature regulation hardware needs replacement but the control knob is not required. It is a practical service part for restoring proper heater response when the existing thermostat is worn, inconsistent, or no longer controlling the system correctly. For pool and spa heaters, small control components can make a noticeable difference in comfort and reliability.