1. Metal contracts in the cold. If you are familiar with some basic physics, you know that metal contracts when the temperature is low. The same can happen to all the metallic components of a garage door, such as the tracks, hinges, springs, and cables. For this reason, the garage door won’t close when cold.Find the Chamberlain garage door opener technical support you need to help fix any issues you may be having with your garage door opener and parts. From informational videos to product manuals and troubleshooting articles, the Chamberlain Group resource library has the information you need. If you're Craftsman, Chamberlain, etc garage door opener is closing and then opening up - its likely a common problem related to the stop limit mechanism. He...Remove the sensors from the brackets. Remove the wires from the wire nuts or cut the sensor wires 12" from the sensors. Strip both ends of wires from each sensor and twist like colored wires together. Proceed with both sensors to the garage door opener motor unit. NOTE: This step is not necessary for safety sensors 041-0136. This video demonstrates what to do if your garage door won't close and the lights on your LiftMaster garage door opener are blinking. Additional Resources:Su...The garage door won’t open with wall switch The following process describes a detailed diagnosis of a garage door that cannot open with a wall switch; Step 1. Test the power outlet. Unplug the opener from the outlet. Take a cellphone charger, plug your phone in, and plug it into the outlet to your garage door opener was connected. Follow the steps below to align your safety sensors. Locate both safety reversing sensors located on each side of the garage door, usually fastened to the door tracks, no higher than 6 inches above the garage floor. Loosen the wing nut on the front of the receiving sensor (green LED) then align the sensor so both lenses are pointing at each ...Get A New Light Bulb. The simplest fix to Chamberlain garage door opener lights not working is the installation of a new light bulb in the unit. If the bulb was working perfectly just a few days ago, and you’ve had no issues for months, then the bulb has likely gone bad. There isn’t much that you can do about this situation with the light ...Jul 18, 2023 · Lex20 / Getty Images. If the garage door won't open, sometimes the reason is that the door is off track due to a loose track. The problem may be preceded by balky or slow movement or by squeaks and unusual noises. To get a garage door back on track, loosen the screws that hold the track to its frame. Garage Door in question: Chamberlain 41A5021-1E ½ HP Security +. Problem: With the open/closing button mounted on the wall, it has started not closing unless you keep the button pushed down until it is closed completely. At any time during the closing, you release the button, it will reverse and open right back up. BTW, it opens with no problems.Besides @longneck's excellent points, if the garage door or opener is a new installation and has not worked before, it could be that the opener's internal "tension sensor" is not correctly set. If the door can be reasonably easily opened and closed by hand, but the opener balks at closing the door, the tension setting probably needs to be ... First make sure that the remote batteries are fresh. Use a battery tester (not just a voltmeter), or just replace the battery. Double check that the receiver antenna wire (if any) is not mangled and has a good connection internally. If the problem persists, it is most likely the receiver/control module.Check the following in order: Check the balance of the garage door opener Disengage the garage door from the opener.Manually lift the garage door 3 to 4 feet off the floor and release.If the garage door forcefully closes to the floor, or is difficult to manually open and close, contact a trained door technician to have the door serviced.In case you cannot find this control, make sure to check the garage door manual, or contact a professional. 5. Faulty Garage Door Opener. As the name itself implies, garage door openers are responsible for opening your garage door. In this case, the issue could be in the sensitivity of the garage door opener and it may have to be adjusted. Besides @longneck's excellent points, if the garage door or opener is a new installation and has not worked before, it could be that the opener's internal "tension sensor" is not correctly set. If the door can be reasonably easily opened and closed by hand, but the opener balks at closing the door, the tension setting probably needs to be ...This video demonstrates what to do if your garage door won't close and the lights on your LiftMaster garage door opener are blinking. Additional Resources:Su...Go to Settings. Tap Applications. Tap Manage applications. Choose the myQ app, and view permissions. This will indicate if the app has a connection to the internet. Uninstall and reinstall the app. After reinstalling the app, look for the app with the myQ logo. Use the links below to verify the correct app is installed. Mar 21, 2018 · If you're Craftsman, Chamberlain, etc garage door opener is closing and then opening up - its likely a common problem related to the stop limit mechanism. He... 8. Activated Lock-Out Button. The purpose of a garage lock-out button is to prevent the garage door from being activated by a wireless controller (like the remote). If this button is engaged when you’re attempting to use the remote, it’s going to cause issues whenever the garage door tries to open or close. Jul 18, 2023 · Lex20 / Getty Images. If the garage door won't open, sometimes the reason is that the door is off track due to a loose track. The problem may be preceded by balky or slow movement or by squeaks and unusual noises. To get a garage door back on track, loosen the screws that hold the track to its frame. Leave the myQ app and go to your phone's Wi-Fi settings. Tap the network that begins with myQ- XXX. Return to the myQ app and tap Next. Select your home Wi-Fi network from the list. Enter your network password and tap Next. Your garage door opener is now connecting. Name your garage door opener and tap Next.If you hear a beep, tap Yes. Apple users: Tap Join to connect to the network myQ-NNN. Android users go to step 11. Select your home Wi-Fi network from the list. Enter your network password and tap Next. Your garage door opener is now connecting. Tap Finish on the success screen. Go back to the Devices screen.In case you cannot find this control, make sure to check the garage door manual, or contact a professional. 5. Faulty Garage Door Opener. As the name itself implies, garage door openers are responsible for opening your garage door. In this case, the issue could be in the sensitivity of the garage door opener and it may have to be adjusted. A 9V battery powers most outside keypads. Yes, your outside keypad has a battery. If your outside keypad is not working, the first thing you want to check is the battery. The easiest way to tell if your battery needs replacement is if the backlight is not shining. The backlight is what lights up the keys, so you can see them at night.I have a Chamberlain 4200 garage door opener. I'm trying to program the remote. I hold down the Transmitter, press the Learn button on the opener, and it doesn't seem to learn.Aug 27, 2010 · Garages, Garage Door Openers, Work Shops & Sheds, Breezeways and Carports - Chamberlain opener won't learn travel limits - Trying to set travel limits on Chamberlain hd800d opener. Original logic board was bad right out of the box. It would not learn the code from remotes, but the door opener worked fine from wall How to Set Up a Chamberlain Secure View Belt Drive Wi-Fi Garage Door Opener in the myQ App. This video is intended for demonstration purposes only. Please consult the manual for complete instructions and safety information. ... 1:55 Connecting your garage door opener to Wi-Fi. Channel: Chamberlain Support Length: 04:29.Unplug the opener and reconnect the wires to the red and white terminals or #1 and #2 screw terminals.Go to the door control, take the door control off the wall by popping off the push button. There is a screw under the push button that holds the door control on the wall. Remove the wires from the back of the door control.Test the remote controls.Nov 16, 2005 · Garage Door in question: Chamberlain 41A5021-1E ½ HP Security +. Problem: With the open/closing button mounted on the wall, it has started not closing unless you keep the button pushed down until it is closed completely. At any time during the closing, you release the button, it will reverse and open right back up. BTW, it opens with no problems. The garage door won’t open with wall switch The following process describes a detailed diagnosis of a garage door that cannot open with a wall switch; Step 1. Test the power outlet. Unplug the opener from the outlet. Take a cellphone charger, plug your phone in, and plug it into the outlet to your garage door opener was connected.A garage door that stops and goes back up is usually due to malfunctioning infrared sensors. If there is such an issue, you can see one of the sensor lights blinking. Malfunctioning sensors can be caused by a blockage, dirty eyes, loose wires, or just bad sensors in general. This causes the transmitters to not function well in closing the ...Jul 2, 2017 · Chamberlain Lift Master Garage Door Opener Troubleshooting. If your garage door opener clicks and doesn't move the door. You have a circuit board issue. M... Aug 27, 2010 · Garages, Garage Door Openers, Work Shops & Sheds, Breezeways and Carports - Chamberlain opener won't learn travel limits - Trying to set travel limits on Chamberlain hd800d opener. Original logic board was bad right out of the box. It would not learn the code from remotes, but the door opener worked fine from wall Apr 21, 2021 · Step 4: Attempt to Close the Garage Door. If you can, it is best to disengage the sensors when the garage door is down. If the garage door is open, the door could fall when you switch to manual mode. If it’s open and it won’t close, move onto the next step. If you have managed to close the door, proceed to step 6. Jan 28, 2023 · Step 3: Apply Lubricant. Cold weather can lead to parts of your garage door expanding or contracting, which can cause the parts to grind together instead of moving smoothly. You will need to add lubricant to your garage door’s moving parts to keep them from getting stuck. You should apply grease or oil to moving parts such as hinges, rails ... Oct 31, 2019 · How to Unlock Your Door Opener. Check to see if your wall control station has a switch. If it does, ensure the switch is in the unlocked position, usually depicted by a visual picture of a locked and unlocked padlock. If you have a lock button, press that lock button and the LED should go solid, showing that the opener is now unlocked. My Garage Door Won't Open All the Way What to Do When Your Garage Door Won't Open All the Way Your garage door opener features adjustable travel and force settings. Travel adjustment allows you to set where the door stops in the up and down position. A 9V battery powers most outside keypads. Yes, your outside keypad has a battery. If your outside keypad is not working, the first thing you want to check is the battery. The easiest way to tell if your battery needs replacement is if the backlight is not shining. The backlight is what lights up the keys, so you can see them at night.Dec 10, 2021 · Garage doors can have all sorts of wonky problems. You might find your garage door is opening itself or the garage door won't open with the remote. But when your auto-reverse feature isn't working correctly, you really have a problem. Use the following tips to adjust the settings. 1. Test the Auto-Reverse Function Jun 19, 2020 · If you suspect that your garage door opener may have been affected by a thunderstorm or lightning, give us a call. Circuit boards can run about $100 per board, which is not cheap! But it's less expensive than replacing the entire unit. Give John a call at 864-506-6735 if you suspect that you need a new circuit board. Leave the myQ app and go to your phone's Wi-Fi settings. Tap the network that begins with myQ- XXX. Return to the myQ app and tap Next. Select your home Wi-Fi network from the list. Enter your network password and tap Next. Your garage door opener is now connecting. Name your garage door opener and tap Next.If you are having trouble pairing your garage door opener with a RED/ORANGE learn button , choose the GREEN button option when going through the in-app setup. In some instances, interference may occur when the hub has been installed too close to the motor unit. Unplug the hub and move it at least 4-6 feet away from the motor-head.The replacement logic board will provide obstruction notifications once it is installed. If the door makes contact with an obstruction while opening, the door will stop, the opener will beep and the lights will flash five (5) times. When the door is in any position other than closed and the garage door opener is activated, the door will close. The garage door won’t open with wall switch The following process describes a detailed diagnosis of a garage door that cannot open with a wall switch; Step 1. Test the power outlet. Unplug the opener from the outlet. Take a cellphone charger, plug your phone in, and plug it into the outlet to your garage door opener was connected.If you're Craftsman, Chamberlain, etc garage door opener is closing and then opening up - its likely a common problem related to the stop limit mechanism. He...Apr 19, 2023 · Allow the motor to cool for about 15 minutes before restoring power and using the garage door opener. Pull the emergency door release and check the up-and-down travel of the garage door for binding. Repair the garage door if it doesn't travel smoothly. If it overheats after a single use and the garage door travel is smooth, replace the motor. We suspect our house got hit by lightning or a power surge and knocked out this Chamberlain garage door opener (part # HD950WFi). Then panel was unresponsiv...Oct 31, 2019 · How to Unlock Your Door Opener. Check to see if your wall control station has a switch. If it does, ensure the switch is in the unlocked position, usually depicted by a visual picture of a locked and unlocked padlock. If you have a lock button, press that lock button and the LED should go solid, showing that the opener is now unlocked. Blinking/Flashing. Blue and Green. One (1) beep. Unable to connect to your home Wi-Fi router. Unable to Connect the Wi-Fi Garage Door Opener to Wi-Fi Network and LED Lights Flash Blue and Green. Blinking/Flashing Green. Two (2) beeps. Unable to connect to myQ internet server. Dec 1, 2020 · This video demonstrates what to do if your Chamberlain garage door won't fully open. Your garage door is designed to stop if it senses resistance or an obstr... See full list on garageadviser.net Chamberlain, Craftsman, and Raynor garage door models made after January 1st, 2011 may require a repeater kit. Chamberlain and Raynor units with My Q or Security Plus 2.0 technology and Craftsman Assurelink units will need a repeater kit. To confirm that you need a repeater kit to make your Car2U transmitter compatible, check for a yellow learn ...When you see your garage door opener lights flashing and the garage door will not close, it could be the safety reversing sensors or the LOCK button.; If there is a safety reversing sensor issue, the main light (s) flash 10 times. Start with aligning the safety sensors. Note : You can close the garage door by pressing and holding the door ...Dec 1, 2020 · 17.9K subscribers Subscribe 277K views 2 years ago Troubleshooting This video demonstrates what to do if your garage door won't close and the lights on the Chamberlain garage door opener... Step 2: Check that the Sensors Are Aligned. Garage door sensors are either sending sensors or receiving sensors. The sending sensor has a yellow or orange LED light that should always be viable. The receiving sensor has a green or red LED light that will only be visible when functioning correctly.The replacement logic board will provide obstruction notifications once it is installed. If the door makes contact with an obstruction while opening, the door will stop, the opener will beep and the lights will flash five (5) times. When the door is in any position other than closed and the garage door opener is activated, the door will close.Jan 28, 2023 · Step 3: Apply Lubricant. Cold weather can lead to parts of your garage door expanding or contracting, which can cause the parts to grind together instead of moving smoothly. You will need to add lubricant to your garage door’s moving parts to keep them from getting stuck. You should apply grease or oil to moving parts such as hinges, rails ... If you hear a beep, tap Yes. Apple users: Tap Join to connect to the network myQ-NNN. Android users go to step 11. Select your home Wi-Fi network from the list. Enter your network password and tap Next. Your garage door opener is now connecting. Tap Finish on the success screen. Go back to the Devices screen.Jan 27, 2022 · A 9V battery powers most outside keypads. Yes, your outside keypad has a battery. If your outside keypad is not working, the first thing you want to check is the battery. The easiest way to tell if your battery needs replacement is if the backlight is not shining. The backlight is what lights up the keys, so you can see them at night. Aug 27, 2010 · Garages, Garage Door Openers, Work Shops & Sheds, Breezeways and Carports - Chamberlain opener won't learn travel limits - Trying to set travel limits on Chamberlain hd800d opener. Original logic board was bad right out of the box. It would not learn the code from remotes, but the door opener worked fine from wall A garage door that stops and goes back up is usually due to malfunctioning infrared sensors. If there is such an issue, you can see one of the sensor lights blinking. Malfunctioning sensors can be caused by a blockage, dirty eyes, loose wires, or just bad sensors in general. This causes the transmitters to not function well in closing the ...Dec 19, 2019 · 1. Garage Door Opener Model: Lift-master 1245R (by Chamberlain) Ok, so this has been quite the puzzle. Roughly a couple of months ago, one of my parents' garage door openers started having problems. The problem was that the garage door seemed to open, but not close when using the remote (it worked fine with the wall button). If the garage door opener button did not work and you do not have a yellow learn button LiftMaster or Chamberlain garage door opener, then you have a bad circuit board and should move to step 4. With a yellow learn button opener, if the wall control LED lit up when you hooked up the jumper wire but nothing happened, bad logic board.If you suspect that your garage door opener may have been affected by a thunderstorm or lightning, give us a call. Circuit boards can run about $100 per board, which is not cheap! But it's less expensive than replacing the entire unit. Give John a call at 864-506-6735 if you suspect that you need a new circuit board.Jun 5, 2021 · When the Lock button is active, the door opener will only work from the Wall switch keypad but the garage door remotes. Start with locating the lock button on the door control. Gently press the lock button to turn this feature off. The light will flash two times. Now, press the remote control button to check whether the door responds. Find the Chamberlain garage door opener technical support you need to help fix any issues you may be having with your garage door opener and parts. From informational videos to product manuals and troubleshooting articles, the Chamberlain Group resource library has the information you need. Here is all you need to do; Detach the wall control unit from the wall and then disengage the wires linking the wall control at the back. This is the test step. Bring the bare ends of the disconnected wall console wires into contact and observe whether the garage door moves. There are also two possible outcomes; If you suspect that your garage door opener may have been affected by a thunderstorm or lightning, give us a call. Circuit boards can run about $100 per board, which is not cheap! But it's less expensive than replacing the entire unit. Give John a call at 864-506-6735 if you suspect that you need a new circuit board.The remote control will not work. To unlock your garage door opener, push the lock button for 5 seconds. Once you push this button, the light on the garage door opener will flash twice. Once you see the double flash, press the control button on the remote control. If this doesn’t fix your problem, then the problem is more than likely the ...Leave the myQ app and go to your phone's Wi-Fi settings. Tap the network that begins with myQ- XXX. Return to the myQ app and tap Next. Select your home Wi-Fi network from the list. Enter your network password and tap Next. Your garage door opener is now connecting. Name your garage door opener and tap Next.Remove the sensors from the brackets. Remove the wires from the wire nuts or cut the sensor wires 12" from the sensors. Strip both ends of wires from each sensor and twist like colored wires together. Proceed with both sensors to the garage door opener motor unit. NOTE: This step is not necessary for safety sensors 041-0136.The Down Travel Needs to be Adjusted. The steps to adjust the travel vary by model. Reference the articles listed below for assistance with making adjustments. How To Adjust The Limit Or Travel On A Garage Door Opener With Manual Adjustment Screws. How To Program The Travel Limits on Garage Door Opener Models 3500D, 3500C, HD800D, WD952KCD ...1. Garage Door Opener Model: Lift-master 1245R (by Chamberlain) Ok, so this has been quite the puzzle. Roughly a couple of months ago, one of my parents' garage door openers started having problems. The problem was that the garage door seemed to open, but not close when using the remote (it worked fine with the wall button).If you suspect that your garage door opener may have been affected by a thunderstorm or lightning, give us a call. Circuit boards can run about $100 per board, which is not cheap! But it's less expensive than replacing the entire unit. Give John a call at 864-506-6735 if you suspect that you need a new circuit board.Sun light can cause interference with the safety sensors, causing the operator to act as if the sensors are blocked. The door will open but will not close and the lights blink 10 times when trying to close. This is caused by sun light shining into the receiving sensor (the one with the green LED), blocking the infrared light from the sending ...The Down Travel Needs to be Adjusted. The steps to adjust the travel vary by model. Reference the articles listed below for assistance with making adjustments. How To Adjust The Limit Or Travel On A Garage Door Opener With Manual Adjustment Screws. How To Program The Travel Limits on Garage Door Opener Models 3500D, 3500C, HD800D, WD952KCD ...Get the LiftMaster garage door support you need from Chamberlain Group. Whether you have a belt drive, chain drive or wall-mount model, find helpful resources for your LiftMaster garage door opener and parts – manuals, videos and more – to help you diagnose and fix the problem. Parts. We suspect our house got hit by lightning or a power surge and knocked out this Chamberlain garage door opener (part # HD950WFi). Then panel was unresponsiv...The Down Travel Needs to be Adjusted. The steps to adjust the travel vary by model. Reference the articles listed below for assistance with making adjustments. How To Adjust The Limit Or Travel On A Garage Door Opener With Manual Adjustment Screws. How To Program The Travel Limits on Garage Door Opener Models 3500D, 3500C, HD800D, WD952KCD ...This video demonstrates what to do if your Chamberlain garage door won't fully open. Your garage door is designed to stop if it senses resistance or an obstr...8. Activated Lock-Out Button. The purpose of a garage lock-out button is to prevent the garage door from being activated by a wireless controller (like the remote). If this button is engaged when you’re attempting to use the remote, it’s going to cause issues whenever the garage door tries to open or close. Follow the steps below to align your safety sensors. Locate both safety reversing sensors located on each side of the garage door, usually fastened to the door tracks, no higher than 6 inches above the garage floor. Loosen the wing nut on the front of the receiving sensor (green LED) then align the sensor so both lenses are pointing at each ...Here are the ones to recognize: Code 1: Safety sensors aren’t aligned properly or even blocked completely. Code 2: The sensors aren’t wired correctly. Code 3: The door control and/or wires aren’t connected. Code 4: The sensors aren’t working part of the time. Code 5: The system can’t detect any RPM activity.Garages, Garage Door Openers, Work Shops & Sheds, Breezeways and Carports - Chamberlain opener won't learn travel limits - Trying to set travel limits on Chamberlain hd800d opener. Original logic board was bad right out of the box. It would not learn the code from remotes, but the door opener worked fine from wallIf you are having trouble pairing your garage door opener with a RED/ORANGE learn button , choose the GREEN button option when going through the in-app setup. In some instances, interference may occur when the hub has been installed too close to the motor unit. Unplug the hub and move it at least 4-6 feet away from the motor-head.Chamberlain Lift Master Garage Door Opener Troubleshooting. If your garage door opener clicks and doesn't move the door. You have a circuit board issue. M...Mar 10, 2019 · If your Chamberlain garage door opener doesn't want to close, and the light clicks 10 times, check this common problem. It's more than likely a safety sensor... The Chamberlain Group LLC, the corporate parent company to LiftMaster, Chamberlain, Merlin and Grifco, is a global leader in access solutions and products. We design and engineer residential garage door openers, commercial door operators and gate entry systems.
@LiftMaster #garagedoor #dyiGarage Door Won't stay Closed - FIXEDIn this video I show you how to easily fix your garage door that wont stay closed.=====.... Nail salons that
the yellow antenna for about 7 seconds until the led near it turns on and turns. back off then release the yellow button. You want to repeat this 3x in a row the opener should beep when successfully. cleared. Note the accessories like remotes and keypad anything wireless will need to be. reprogrammed to the opener.Lock Mode. When the garage door opener is in lock mode, the LED light on the door control will constantly flash and the hand held remote controls will not operate your garage door opener. The light bulb on the opener will also flash twice when you attempt to activate the door with your remote. To take the unit out of lock mode, press and hold ... 17.9K subscribers Subscribe 277K views 2 years ago Troubleshooting This video demonstrates what to do if your garage door won't close and the lights on the Chamberlain garage door opener...Find the Chamberlain garage door opener technical support you need to help fix any issues you may be having with your garage door opener and parts. From informational videos to product manuals and troubleshooting articles, the Chamberlain Group resource library has the information you need.Using a flat screwdriver, twist the “down” screw in quarter-turn increments, checking how your garage door operates between adjustments. Adjust it until the door closes all the way and compresses the rubber seal slightly. If the door closes and bounces back open, back the “down” adjustment off. 6. Check Your Manual.Apr 19, 2023 · Allow the motor to cool for about 15 minutes before restoring power and using the garage door opener. Pull the emergency door release and check the up-and-down travel of the garage door for binding. Repair the garage door if it doesn't travel smoothly. If it overheats after a single use and the garage door travel is smooth, replace the motor. Lock Mode. When the garage door opener is in lock mode, the LED light on the door control will constantly flash and the hand held remote controls will not operate your garage door opener. The light bulb on the opener will also flash twice when you attempt to activate the door with your remote. To take the unit out of lock mode, press and hold ...When your opener won't activate from either the remote control or door control, it could be the garage door opener is overheated. The overload protector may have tripped as a result of running the opener multiple times during installation or an adjustment. The most common causes are: No power to the opener. The garage door opener is overheated. 8. Activated Lock-Out Button. The purpose of a garage lock-out button is to prevent the garage door from being activated by a wireless controller (like the remote). If this button is engaged when you’re attempting to use the remote, it’s going to cause issues whenever the garage door tries to open or close. Dec 1, 2020 · 17.9K subscribers Subscribe 277K views 2 years ago Troubleshooting This video demonstrates what to do if your garage door won't close and the lights on the Chamberlain garage door opener... Door MUST reverse on contact with 1-1/2" high (3.8 cm) object (or 2x4 laid flat) on the floor. To prevent damage to vehicles, be sure the open door opens fully to provide adequate clearance. Before making any adjustments to your garage door opener, we recommend that you test the balance of your garage door.Here are possible solutions to try when the garage door opener hums and the door does not move. The following garage door openers will have different resolutions: Chain or belt drive openers. Screw drive openers. Wall-mounted openers. Resolve Humming Issues For a Chain or Belt Drive Opener Resolve Humming Issues for a Screw Drive OpenerI have a Chamberlain 4200 garage door opener. I'm trying to program the remote. I hold down the Transmitter, press the Learn button on the opener, and it doesn't seem to learn.Besides @longneck's excellent points, if the garage door or opener is a new installation and has not worked before, it could be that the opener's internal "tension sensor" is not correctly set. If the door can be reasonably easily opened and closed by hand, but the opener balks at closing the door, the tension setting probably needs to be ... My Garage Door Won't Open All the Way What to Do When Your Garage Door Won't Open All the Way Your garage door opener features adjustable travel and force settings. Travel adjustment allows you to set where the door stops in the up and down position.Dec 31, 2020 · Step 4 - Check Obstacle Sensors. Although four (instead of five) flashes typically indicates an issue with the sensors, it’s worth taking a quick look to see if it resolves the issue. Check the sensors located on either side of the door opening, near the bottom. If either one is blinking, that will stop the door from closing and cause it to ... .