The Genie 33950R.S Up Limit Switch (Grey, 66-inch lead) is a genuine OEM replacement part designed to restore proper open-travel control on compatible Genie residential garage door openers. This color-coded grey switch signals the opener to stop at the fully open position, helping prevent overtravel and ensuring consistent, reliable operation. It is intended as a direct replacement for a failed or inconsistent up/open limit switch and is commonly used on Genie openers that utilize discrete wired limit switches.
Installation typically involves disconnecting power, mounting the new switch in the original location on the opener/rail assembly, routing the pre-wired harness to the control board, and then reprogramming or fine-tuning the opener’s travel limits per the owner’s manual. For compatibility, verify that your opener’s parts list specifies part number 33950R.S before ordering. After replacement, test door travel and safety reversal to confirm correct operation. This is an OEM Genie service part suited for residential garage door opener repair, ideal for buyers searching for a reliable replacement up limit switch for select Genie models.