Understanding Liftmaster Error 6

When your Liftmaster garage door opener displays Error 6 (six flashes or blinks), it's indicating a problem with the motor circuit or thermal protection system. This error typically occurs when the motor has overheated or there's an issue with the motor circuit board.

What Causes Error 6?

Several factors can trigger Error 6:

  • Motor overheating due to excessive use
  • Faulty motor capacitor
  • Damaged circuit board
  • Door weight imbalance causing motor strain
  • Blocked ventilation around the motor
  • Electrical connection issues

How to Fix Error 6

Step 1: Allow Motor to Cool

If the error is due to overheating:

  1. Stop using the opener immediately
  2. Wait 30 minutes for the motor to cool down
  3. Ensure proper ventilation around the motor unit
  4. Check for any objects blocking airflow

Step 2: Check Door Balance

An unbalanced door can strain the motor:

  1. Disconnect the opener (pull the emergency release cord)
  2. Manually lift the door halfway
    • Door should stay in place
    • If it drops or rises, springs need adjustment
  3. Test the door's movement throughout its range

Step 3: Inspect Electrical Connections

Check for electrical issues:

  1. Disconnect power to the opener
  2. Inspect all visible wiring for damage
  3. Check for loose connections
  4. Look for signs of burned or discolored components

⚠️ Important Safety Warning

Never attempt to repair electrical components without proper knowledge and training. Electrical repairs can be dangerous and should be handled by qualified professionals. Always disconnect power before inspecting the opener.

Signs of Motor Circuit Problems

Watch for these indicators:

  • Burning smell from the opener
  • Motor running unusually hot
  • Humming sound without door movement
  • Intermittent operation
  • Slow or irregular door movement

Prevention Tips

To prevent Error 6 from recurring:

  • Maintain proper door balance
  • Keep the motor unit clean and well-ventilated
  • Avoid excessive use in short periods
  • Schedule regular maintenance checks
  • Address unusual sounds or operation promptly

When to Call a Professional

Contact a professional immediately if:

  • Error persists after cooling period
  • You notice burning smells
  • There's visible damage to electrical components
  • Door is severely unbalanced
  • Motor makes unusual sounds

Long-term Solutions

Consider these options for preventing future issues:

  • Install a ventilation system near the opener
  • Upgrade to a higher-capacity opener if door is heavy
  • Regular professional maintenance
  • Replace aging components before they fail