LiftMaster Garage Door Error Code 20: How to Fix It
Easy 5-10 minutes Medium Severity
Verified June 2026
- Error Code
- 20
- Brand
- LiftMaster
- Product Type
- garage_door
- Severity
- Medium
- DIY Difficulty
- Easy
- Estimated Fix Time
- 5-10 minutes
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Tools You'll Need
- Phillips screwdriver (if applicable)
- New 9V battery or CR2032 battery
How to Fix Error Code 20
-
Locate the keypad
-
Open the keypad battery compartment
-
Remove the old battery
-
Insert a new battery
Dispose of old batteries properly. -
Close the keypad cover
-
Test the keypad
Parts You May Need
9-Volt Battery (or CR2032)
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9-Volt Battery (or CR2032)
Check Price on Amazon
9-Volt Battery (or CR2032)
Check Price on Amazon
9-Volt Battery (or CR2032)
Check Price on Amazon
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When to Call a Professional
If replacing the battery does not clear the error, the keypad may be faulty or there may be a wiring issue. Contact a professional garage door technician for further diagnosis.Frequently Asked Questions
Why is my LiftMaster keypad beeping?
A beeping keypad usually indicates a low battery. Replace the battery as described above.
How often should I change the keypad battery?
Keypad batteries typically last 1-2 years depending on usage. Replace it annually to avoid unexpected failures.
What type of battery does my LiftMaster keypad use?
Most LiftMaster keypads use a 9-volt battery. Some newer models use a CR2032 coin cell. Check your manual or open the keypad to confirm.
Will resetting the opener fix error code 20?
No, error code 20 is specifically a low battery warning. Resetting the opener will not replace the battery. Replace the battery first.
Can I use a rechargeable battery?
Rechargeable 9-volt batteries may work, but standard alkaline batteries are recommended for optimal performance.