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000-ohm thermistor measured at 77
This Marley thermostat is verified for use with QMark and Berko models DH1521D
Red signifies a
the switch is likely stuck open and requires replacement
extending the component's operational life
White Rodgers 1E78-140 Thermostat 000-ohm thermistor measured at 77The White Rodgers 1E78 140 Thermostat provides a rugged, field proven solution for single stage heat only systems. Operating on 24V low voltage or millivolt systems, this vertical non programmable unit is the preferred choice for technicians replacing older mechanical mercury thermostats in residential or light commercial applications. Its digital LCD backlit display offers high contrast visibility, ensuring accurate temperature readings within a 1