Test your garage door once a month with three checks: balance (the door stays put when lifted halfway by hand), auto-reverse (the door reverses when it meets a 2x4 on the floor) and photo eyes (the door stops when the beam is blocked). If any test fails, stop using the opener and have a technician look at it.
Why test every month
A garage door is the largest moving object in most homes. In a safety alert, the U.S. Consumer Product Safety Commission (CPSC) reported that about 73 children between 2 and 14 had been trapped and killed under automatic garage doors since March 1982, and it asks homeowners to inspect the door and opener every 30 days.
The three tests below take about ten minutes and need no tools beyond a short length of lumber. They check the three systems that protect people: the springs that balance the door, the reversing system and the photo eyes.
What you need
- A 2x4 board, laid flat
- A soft cloth for the sensor lenses
- Your opener's owner's manual for the adjustment steps
- Someone to stay clear of the door while you test
Run each test from the wall control or the remote. Never put your hand or foot under a moving door to see if it will reverse.
Test 1: the balance test
Close the door
Start with the door fully closed. Pull the red release handle to disconnect it from the opener.
Lift it by hand
Lift the door slowly about halfway. A balanced door stays in place when you let go. CPSC describes a properly operating door as one that stays where it is stopped in any partly open position.
Stop if it is heavy
If the door feels heavy, drops, rises on its own or binds, lower it carefully and stop. That is a spring or cable problem. Do not adjust the springs yourself; see garage door spring repair.
Reconnect the opener
Close the door, then re-engage the release as your manual shows.
Test 2: the auto-reverse test
Place the 2x4
With the door open, lay a 2x4 flat on the floor in the center of the door's path.
Close the door
Close the door with the wall control and stay clear. The door should stop and reverse as soon as it meets the board. Chamberlain's instructions describe a 1-1/2 inch object, which matches a 2x4 laid flat.
If it does not reverse
Stop using the opener's automatic close. Adjust the down travel and force only as the owner's manual directs, then test again. CPSC says an opener that does not reverse on the 2x4 should be disengaged until it is adjusted, repaired or replaced.
Test again after any adjustment
Repeat the test after every change. Chamberlain advises testing monthly and after any adjustment.
Test 3: the photo-eye test
Since 1993, openers must have an entrapment protection system, such as an electric eye or a door edge sensor, according to CPSC. If your door uses photo eyes, they should be installed at a height of 4 to 6 inches above the floor, one on each side of the door.
Clean both lenses and check that each indicator light is steady. Then close the door with the wall control and, from the side, pass a broom handle through the beam as the door travels down. The door should stop and reverse. A blinking light, a door that ignores the beam, or a sensor that has been pushed out of line needs attention: see why a garage door will not close.
Reading your results
| Test | A pass looks like | A fail looks like | Next step |
|---|---|---|---|
| Balance | The door stays put when lifted halfway | It feels heavy, drops or rises | Stop and call a technician |
| Auto-reverse | The door reverses on the 2x4 | The door stops on the board or keeps closing | Adjust per the manual, retest, then call |
| Photo eyes | The door stops and reverses when the beam is blocked | The door ignores the beam or the light blinks | Clean and realign, then call if it persists |
These tests check safety. They do not replace a full inspection.
When to call a technician
Call if any test fails after one careful adjustment, if the door is heavy or crooked, or if a cable or spring looks damaged. Our 12-point safety inspection is $89 and covers the springs, cables, rollers, tracks, sensors and opener. We repair doors in cities such as Riverside, Long Beach and Thousand Oaks. Call (213) 340-4232 or send the estimate form.
Questions people ask
How often should I test my garage door?
CPSC recommends inspecting the door and the opener every 30 days. Test the reversing feature monthly and after any adjustment.
What is the 2x4 test?
You lay a 2x4 flat on the floor in the door's path and close the door. The door should reverse when it meets the board. If it does not, the opener should be adjusted according to the manual, repaired or replaced.
If the door reverses on the board, do I still need to test the photo eyes?
Yes. The reversing system and the photo eyes are separate protections, and both should work.
Can I adjust the springs if the balance test fails?
No. Springs and cables are under high tension. A door that fails the balance test needs a technician.
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