Siemens Combustion SQM40.155R11 Actuator Refrigerant Fail-Safe Reliability: Integrated spring return

Fail-Safe Reliability: Integrated spring return ball valve mechanism ensures the system defaults to a closed position during power interruptions

Repair high-limit error codes and restore furnace safety with the Carrier HH12HC171 Limit Switch

this 50VA rated component provides a stable 24V secondary output

By maintaining precise combustion airflow

If your diagnostics point to a main PCB failure rather than a wiring fault

Siemens Combustion SQM40.155R11 Actuator Refrigerant Fail-Safe Reliability: Integrated spring returnFor burner and industrial process control, the Siemens SQM40. 155R11 Actuator provides high torque precision in a compact package. This 120V actuator delivers 5 Nm (44 in lbs) of force with a fixed 15 second run time, specifically engineered for counter clockwise (CCW) rotation. Designed for the regulation of air dampers, gas butterfly valves, and oil pressure controllers, it is a critical component for combustion air control in medium to high