The “boiler connection safety switch actuator”:
The image below shows the actuator correctly inserted between the pellet burner and the boiler door, which is securely closed. The pellet burner will not start without the actuator correctly in place. The pellet burner will shut off if it comes out of place.
The actuator is removed during boiler cleaning or pellet bin filling.
A side view showing the top of the actuator securely tucked under the lip of the cast iron boiler door. The safety switch plunger is firmly held in the closed position.