An automated thermally responsive valve with an internal reset function is disclosed. The cartridge latching mechanism can be retracted at a target temperature and manually reset at the target temperature to engage an ejector cap. The reset mechanism of the cartridge automatically returns to a latching configuration upon warming. The cartridge thermal actuator can be configured to retract the latching mechanism at a target temperature near freezing to provide a freeze protection drain valve that is ejected from a sealing element in the ejector cap and allows a fluid system to drain.