Opener runs but door moves very slowly or struggles, especially in cold weather.

Safety first: If the door stalls, stop the opener immediately to avoid overheating the motor.

Steps to fix:

• Service door hardware: Clean excess grease from tracks and lubricate rollers and hinges with a cold-weather garage door lubricant.
• Test door balance: Ensure the door moves freely by hand. Correct any binding.
• Check capacitor: Inspect the motor start capacitor for bulging or leakage and replace if suspect.
• Consider motor replacement: If the motor is weak despite good hardware and capacitor, replace the motor assembly or entire opener.