Safety first: Spring adjustments are dangerous and should be performed by a professional. Do not attempt to adjust torsion springs yourself.

Steps to address incomplete opening:

1. Check door balance: Disconnect the opener and lift the door manually. If it is heavy or will not stay open, the springs are weak or broken and must be serviced by a garage door technician.
2. Inspect header area: Ensure the top of the door is not hitting the opener rail, header bracket, or any ceiling obstruction.
3. Adjust up limit: On the Stanley opener, turn the UP LIMIT adjustment slightly to increase travel until the door opens fully without hitting stops.
4. Inspect drive system: Check the chain or belt tension. A sagging chain or slipping belt can reduce lift. Adjust tension according to the Stanley manual—typically leaving about 1/4 inch of sag at the midpoint.
5. Lubricate hinges and rollers: Apply garage door lubricant to all hinges and roller bearings to reduce friction.

Garage door will not open fully; stops short of the fully open position, leaving the door partially down.

Possible Causes