it typically signals a failure in the electromagnetic coil or worn contacts

dirty filter

while it is the primary replacement for Honeywell and Resideo parts like the A505-1

The Danfoss 034L0021 is compatible with R22

Johnson Controls M9116-AGC-2 Actuator Els PW 29614 it typically signals a failureThe Johnson Controls M9116 AGC 2 is a robust, non spring return actuator designed for the precise positioning of air dampers and valves within commercial HVACR systems. Delivering a steady 140 lb in torque, this unit is the direct replacement for D24 140 A, ensuring seamless integration into existing control setups. Engineered for versatile field performance, it supports 24Vac Vdc floating control or two position (on off) logic, providing technicians