Operating Instructions DuoFern Radiator Actuator 9433 F. Tepaße Updated July 20, 2023 10:00 Follow Download PDF Related articles Operating Instructions DuoFern Radiator Actuator 9433-1 What are scenes? The radiator actuator shows E1 in the display, what to do? Operating instructions DuoFern Room Thermostat 9485 What are the differences between the radiator actuator (9433) and the radiator actuator 2 (9433-1)?