verify that the 24V power supply is present at the actuator terminals

including popular 189BNV and 24VNA series units

or a drop in static pressure

the SEN1447 is the current OEM temperature sensor for numerous legacy and current models

Reznor 222756 Sensor THPU32HP7Y verify that the 24V powerThe Reznor 222756 CL77 Space Sensor is a precision engineered ambient temperature sensor designed for seamless integration with Reznor HVAC systems. Built for industrial grade durability, this CL77 space sensor monitors environmental conditions with high accuracy, transmitting real time data to the control module to optimize cycles in unit heaters, duct furnaces, and rooftop systems. By providing stable feedback, it effectively eliminates significant