The LiftMaster 41D3452-2 Limit Switch Assembly is an OEM replacement part engineered to control the opener’s up and down stop points by signaling the logic board when the door has reached its fully open and fully closed positions. When this assembly wears out or fails, common symptoms include the garage door overrunning its stops, stopping short, or the operator continuing to run after travel should end. Installing the genuine 41D3452-2 restores precise travel control and reliable stopping performance on select LiftMaster residential garage door openers that specify this part number in their parts diagram (also commonly referenced in Chamberlain-made units under the LiftMaster brand).
This assembly mounts inside the operator head and is actuated by the drive mechanism to indicate each travel limit. It connects to the opener via a factory-style harness, and replacement typically involves disconnecting power, removing the opener cover, swapping the assembly, and then readjusting the travel limits per the opener’s owner’s manual. After service, test the safety reversal system, photo eyes, and force settings to ensure compliant operation. For compatibility, match 41D3452-2 to your model’s official parts list or service manual; using the exact part number helps ensure correct fit and function for a long-lasting repair on applicable LiftMaster garage door openers.
Compatible with LiftMaster 2575, 3275, 3575 and 3575S models