Question 1

door opens all the way but then immediately starts closing again by itself

Accepted Answer

DIAGNOSIS The up travel limit is set too far. The door is traveling past its mechanical stop, triggering a safety reversal that interprets the event as an obstruction. FIX Adjust the up limit switch. Locate the adjustment screws on the motor unit. Run the door to the fully open position. Turn the 'Up' limit screw clockwise in small increments (1/8 turn). Run the door. Repeat until the door stops just before it would strain against the opener's mechanism. IF THAT DIDN'T WORK The safety reversal may be due to a weak signal from a remote. The door may be receiving a second 'close' command from a faulty remote button that is sticking. Remove the batteries from all remotes and test operation using only the wall control panel. HEADS UP Improperly set travel limits are the primary cause of erratic door behavior. After adjusting the up limit, re-check the down limit to ensure the door still seals properly on the floor.

Question 2

remote works but the wall control panel is totally dead, no lights at all

Accepted Answer

DIAGNOSIS The wall control panel has no power. This is almost always a wiring issue between the motor unit and the wall mount. FIX Check the connections at the motor unit. The wall panel wires connect to terminals marked '1' and '2' on the opener's back panel. Ensure the wires are securely under the screw terminals and not touching each other. Next, inspect the wire run for damage, especially where it enters the wall or near the door track. IF THAT DIDN'T WORK The wall control unit itself may have failed. To test, temporarily disconnect the existing wires from terminals 1 and 2. Touch the bare ends of those two wires together briefly. The door light should turn on. If it does, the wiring is good and the wall unit is faulty and needs replacement. HEADS UP Always disconnect power to the opener before working on the wiring. The low-voltage terminals are safe, but the main power line to the unit is 120V AC and can cause serious injury.

Question 3

battery backup on my 87504 beeps every 30 seconds, how do i make it stop?

Accepted Answer

DIAGNOSIS The periodic beep indicates the backup battery is depleted, failing, or not properly connected. The system is alerting you it cannot function during a power outage. FIX Replace the backup battery. The required battery is a 12V, 18Ah sealed lead-acid battery with F2 terminal connectors. Disconnect the old battery's red and black wires, remove it, install the new one, and reconnect the wires. The beeping should stop immediately upon establishing a proper charge connection. IF THAT DIDN'T WORK If beeping continues with a new battery, the charging circuit in the opener may be faulty. Check the fuse on the opener's main control board. A blown fuse will prevent battery charging. Refer to for the fuse location and replacement spec. HEADS UP The battery is essential for operation during a power outage. Do not simply disconnect the battery to silence the beep. A non-functional backup system will leave the door locked shut if the power fails.

Question 4

the yellow learn button light on my liftmaster is blinking but i didn't touch it

Accepted Answer

DIAGNOSIS A blinking yellow light on the 'Learn' button indicates the opener is in programming mode, ready to receive a new remote or keypad code. This can be triggered by a nearby radio signal or a failing control board. FIX Press and release the 'Learn' button once. This will clear the blinking mode and exit programming. The light will turn off. All your previously programmed remotes and keypads will remain active. No further action is needed. IF THAT DIDN'T WORK If the blinking resumes spontaneously, a power surge or brownout may have corrupted the opener's memory. Perform a full system reset: unplug the opener for 30 seconds. While it is unplugged, also remove the battery backup (if installed). Reconnect power and reprogram all remotes and keypads. HEADS UP While the light is blinking, anyone with a compatible remote can program it to your opener. Clear the blinking mode as soon as you notice it to maintain security.

Question 5

myq says my garage door is open when it's definitely closed, status is wrong

Accepted Answer

DIAGNOSIS The travel limit switch for the 'closed' position is misadjusted or the sensor on the door is faulty. The opener does not physically know where the door is. FIX Manually adjust the down limit. Locate the adjustment screws on the side of the motor unit. With the door closed, turn the 'Down' limit screw counter-clockwise in small increments until the status light on the opener blinks once, confirming the new limit is set. Test the operation. IF THAT DIDN'T WORK The problem may be the wall control panel or its wiring. A short in the wires can send false 'open' signals. Temporarily disconnect the wall panel from its terminals on the motor unit. Use a remote to operate the door and check if the MyQ status becomes accurate. HEADS UP Do not rely on the inaccurate MyQ status for security. Readjust the limits immediately. An improperly set down limit can also cause the door to reverse before fully closing.

Question 6

garage door opener is making a loud grinding noise but only when going down

Accepted Answer

DIAGNOSIS This is likely worn gear and sprocket assembly noise, exacerbated by the load of lowering the door. The plastic gear inside the opener is designed to wear out first to protect the motor. FIX The unit requires a gear and sprocket replacement kit. Model 41A2034 is the common kit for this chassis. You must disconnect the opener from power and manually disengage the door carriage before starting. Follow the kit instructions to replace the plastic drive gear and the associated metal components. IF THAT DIDN'T WORK If the noise persists after gear replacement, the issue is external. Lubricate the door's metal rollers, hinges, and springs with a silicone-based lubricant. Do not use grease or WD-40. Check for binding in the tracks. HEADS UP Continuing to run the opener with a stripped gear will damage the motor. The unit will eventually stop moving the door entirely. Replace the gear kit at the first sign of grinding.

Question 7

liftmaster smart garage opener won't connect to my wifi, the light just blinks blue forever

Accepted Answer

DIAGNOSIS The opener's Wi-Fi module is in pairing mode but cannot establish a connection. This is typically a network compatibility issue. FIX Ensure your router broadcasts a 2.4 GHz network. The 87504-267 does not connect to 5 GHz bands. Disable any 'Smart Connect' features that merge bands. During setup in the MyQ app, when prompted, connect your phone to the opener's temporary network (starts with 'MYQ-'). Complete the process without switching apps. IF THAT DIDN'T WORK The opener may be too far from the router. The Wi-Fi signal must reach the motor unit, not just the door. Consider a Wi-Fi extender. Alternatively, a power cycle can reset the module: unplug the opener for 60 seconds, then restart the setup process from the beginning. HEADS UP The MyQ app requires you to create an account and add the opener as a new device. You cannot control it via a generic smart home app without the MyQ hub.

Question 8

my liftmaster 87504 just beeps three times when i try to close it, what's that mean?

Accepted Answer

DIAGNOSIS Your opener is detecting an obstruction in the door's path. This is a safety reversal. The three-beep pattern is the standard alert for this event. FIX First, clear the door's track and floor area of any objects. Check the photo-eye alignment. The small green lights on both sensor units must be solid, not blinking. If misaligned, adjust the brackets until both lights are steady. Test the door operation by holding down the wall button. IF THAT DIDN'T WORK The door's force limits may be set too low. Press and hold the wall button to close the door. If it reverses, increase the 'Close Force' setting one increment at a time using the opener's adjustment controls. Do not exceed what is necessary to close the door. HEADS UP Never try to bypass the safety sensors by holding the wall button. The three-beep error will persist until the obstruction condition is fully resolved.

LiftMaster 87504-267 Smart Garage Door Opener

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