Known as the Door Operator Guru, Roy Bardowell is one of the most respected and knowledgeable men in the garage door and operator industry.  His special passion for residential garage door, commercial door and gate operators leaves an impression on everyone he meets.  Roy's training sessions at IDA Expos are always the one of the most widely attended sessions. He has been recognized by IDEA with the "Commitment to Excellence Award" and is an IDEA Certified Door Dealer Consultant.  Roy was Operations Manager at Guardian until 2012.  We hope that you find Roy's articles informative and entertaining.  Feel free to leave your comments for Roy.


by Roy Bardowell, CDDC

Specs, rules, guidelines, observations, and common data on residential operators

A few months ago, I was called to job where the homeowner claimed his newly installed door operator would only open his seven-foot high door six feet. I thought this would be an easy repair simply by adjusting the up limit or maybe the open force was set to low. The worst case would be a broken torsion spring. Regardless of how I adjusted the limits I could only achieve less than enough travel to fully open the door.

This is when I got down to basics. Even though the homeowner insisted his garage door was 7-feet high, it looked wrong, so I got out my trusty tape measure and measured 7-feet, 6-inches. The guy couldn’t believe it until he saw for himself. He asked, “is your tape measure accurate”. I chuckled, but not too loudly. He said the installer of his operator said the door was 7-feet high. I told him “seven feet is the norm, but there are exceptions and you have one”.

The door height measured exactly 90-inches high (7’6”). Then I measured the rail which measured 99 inches long. Boom! There’s the problem. T-bars for a 7-foot door should be 111 inches long. It’s a pretty simple calculation. Most trolley type operators require a rail that is 2 feet (24”) more than the door height. When you get to commercial sectional doors using a drawbar type operator you will need rails that are 3 feet more than the door height. At this home an unexperienced installer assembled the rail to an operator for a seven-foot-high door and installed it on a 7’6” high door. There are no rails made for a 7’ 6” high door, so you must employ a rail for the next common door height. When I told the homeowner his door needed the rail for an 8-foot high door he wanted to know if the repair and parts were free? I’m pretty sure he thought I was scamming him. Of course, I said, “NO”, but told him to call the original installing company and ask them to make it right, since it was them who goofed; where they promptly told him to take a leap. “The warranty had expired.”

Wanting to make the guy happy and not think door guys were crooks, I told him I would fix the problem for my cost. All I had to do is take down the operator and swap out the rail for the proper one. Then remount the head a little further back with new perforated angle. I went the extra mile by buying a belt rail to provide a little less noise than he had before.

Overall, I spent about 90 minutes to make the door right and acquired a lifelong customer. The guy even tipped me after the job was done. The guy wanted to know why it was done wrong to begin with, which I didn’t have an answer. I can say that the installing company charged about $100.00 more than I would and has been in our industry magazines exposed as a Bad Bob. This is what happens when you’re taught how to scam and oversell first and good training takes a back seat. Operator specifications are readily available, but sometimes ignored which has led to problems. Honestly, most of my repairs are to correct an incorrect installation.

Just for example how many installers install a 1/2 HP motor on every door regardless if it is well balanced or not. When I started installing operators in 1972, residential door operators were powered only with a ¼ or 1/3 HP motor and they opened doors perfectly, all day long for many years. Installing a 1/2 or ¾ HP on a well-balanced residential door is a waste of power, electricity, a waste of money, and completely unnecessary.

Plain & simple—if a door cannot be manually operated easily, then fix the door so it can be manually operated easily. Easily is by using one arm. Installing a ¾ HP or more powerful to lift a broken door is irresponsible and dangerous. Even operators using a ¼ HP motor will exhibit hundreds of pounds of downward pressure. It only takes five pounds to choke off a person’s windpipe. If a power outage occurs and someone releases the heavy door it will be like a huge guillotine which can injure, crush or kill someone underneath the door.

Believe me this has happened before and more than once.

So, more power is not always the best choice. When Ryobi® started selling door operators at The Home Depot with a 2 HP rated motor, I was scared that someone would be seriously injured by the over-powered opener and bone crushing door.

Specs, rules, guidelines, observations, and common data on residential door operators:

● Regardless of whether the operator has an AC or DC motor the operator will plug into a standard house 120-volt receptacle. Most residential door operator manufacturers provide a 4 to 6-foot power cord which will reach most outlets in the garage ceiling if the electrical contractor responsible for the house electrical placed the outlet correctly. Electrical contractors who wire homes have historically been confused by the placement of the operator outlet. Many new homes are pre-wired for an operator and miss-place the pushbutton wires in the wall too low. Everyone should know the pushbutton should be placed higher than 5-Feet above a standing surface. The push-button or wall console must be higher than 60 inches from a standing surface.

A standing surface could be the floor or from a stair. If the button was pre-wired and lower than 60-inches, ignore that and make it right, even if you have to place the bell wire on the wall and ceiling with staples. Safety over-rules looks! ALL THE TIME!

● If the garage has no available power outlets which is rarely the case, it is NOT your responsibility to wire and provide one. It is the responsibility of the homeowner to call in a licensed electrician and supply the power receptacle. Most times there is a light in the middle of the garage and a homeowner may think this will suffice. Although there will be 120-volts at the light, it is on a switch which can be turned off. Too many times I have found the outlet seven feet back from the header forcing me to supply a 6-foot extension cord which is not recommended. I guess the electricians think the operator for a 7-foot door will be only seven feet long. If a seasoned doorman can make this mistake, then any other person can and will—Murphy’s law.

● Some operator manufacturers can provide a slightly longer power cord that would reach a misplaced ceiling outlet and you should carry one or two units with the longer cord just for these weird garages.

● Federal law dictates that all residential door operators sold in the US must be evaluated, approved, and meet the requirements of the Underwriters Laboratories (UL) 325 safety standard.

● All residential door operators are provided with a set of photo sensors that pulse infrared light. Many believe the photo beam is a straight line like a lazar, but in reality, the beam is pulsing like a strobe.

Infrared light is invisible to the naked eye, but surrounds us all day within the regular light spectrum from the sun. The receiver sensor can fault if it gets direct sunlight. This usually happens during sunrise or sunset when the sun is on the horizon. One of the sensor units emits a pulse of light and the other sensor looks for it and counts the pulses. If you suspect solar interference, you can test the sensor by blocking the sunlight hitting the sensor. Most of the time it will be the RX which is affected. If blocking the sunlight permits the door to close, you can cut a piece of cardboard to form into a shade and tape it to the sensor or reverse both the TX and RX sensors.

The unit that transmits light will be called the TX and the unit that receives the light pulses is known as the RX. Most manufacturers pulse at 7-10 times per second. This is known as the PULSE CODE and is the reason why photo-sensors are product brand specific and not universal. If the receiver is looking for 7 pulses per second and sees only 6, it will think there is an obstruction and reverse the door. Even a leaf blowing through the invisible beam can be detected and change the pulse count received at the RX.

Both sides must be installed no higher than six-inches from the floor. This is known as the six-inch rule, which now applies to every operator including commercial and gate operators.

● On hollow metal doors it is best to install a structural angle or an ARB bracket so the operator has a strong point to lift the door from. Actually, the support should be provided on every steel door. Make it a habit!

At minimum supply a 21-inch piece of punched angle and screw it vertically from the center hinge between the third and top panel to the top section. Homeowners who install their own operator usually forget this important structural component. Always have an ARB door bracket with you in case you visit a garage with a damaged top section.

● Most operator motor heads are 10 inches wide. If your new operator head is around the same it may line up with the support angles already bolted to the ceiling saving you time on the installation.

● The overall length of an operator and rail for a seven-foot high door will be approximately 124 inches long. This can vary by manufacturer, but it will only vary by a few inches.

● On a sectional door, the curved arm connects to the door bracket, but on a one-piece door the straight arm connects to the door bracket and the curved arm connects to the trolley. With sectional doors set the down limit so the straight arm is angled slightly back toward the motor head when the door is closed. With your left shoulder next to the door the straight arm should point at 1 o’clock. and no more. Pointing it more will cause you to lose power at start.

● Operators with dual lighting on the sides such as the Guardian 628 are superior to one light in your face when you drive into a garage at night. After-all you really want to provide light where people exit the car and walk.

● If you want to electrically operate a door over 7 feet high you will need to use the rail for the next length up, (8’). This must be observed even if the door is only 3 inches over seven feet high. So, doors that are slightly higher than 7 feet need an operator rail for an 8-foot door. Price and plan the job accordingly. A nine-foot high door needs the rail for a 10-foot door. Consult the factory if not sure.

● Chain drives are strongest and the most durable.

Belts are quieter, but weaker than chain, and more expensive.

Screw drives are less efficient than chain or belt drives. They are inefficient because of the extreme friction produced. This is why screw trolleys continuously fail or wear out. The friction destroys them quickly.

● Remotes and wireless keypads transmit on low power RF which stands for RADIO FREQUENCY. And must be approved by the rules and regulations of the FCC (Federal communications commission under CFR 47 article 15.

47 C.F.R. 15.5 contains a general provision that says; devices may not cause interference and must accept interference from other sources. It also prohibits the operation of devices once the operator is notified by the FCC that the device is causing interference.

Basically article 15 says our remotes cannot produce any interference that may affect other wireless devices, but must accept interference from other RF transmitters.

It is due to this standard we sometimes have interference in our radio devices. It is a federal rule!

● When you attach the red release handle to the trolley, ensure the handle or knob is only 72 inches from the floor so children can reach it.

● Most residential door operator manufacturers provide the more secure rolling code for their remotes with millions of potential codes. The rolling code changes with each operation and even if someone grabbed or copied the code, it would be useless to them.

● Make sure all wires are secured well and not breached by a staple.

Shorted wires are a common issue. If the homeowner claims the door has opened on its own, check the wires. Most of the time the problem will be a short by a staple. On dry days everything will be fine, then after a rain storm, the humidity goes up and the damp staple shorts the circuit. You should also inspect the wires behind the pushbutton. If you come across an old fashion key-switch you should convince the homeowner it compromises they’re security and offer the more secure keypad.

● Remotes on car visors also compromise security. In warmer climates people sometimes leave the car window open a few inches where someone can reach in and steal the remote or walk up to a car parked in the driveway and press on the remote button with a stick and open the garage door. The best way to prevent this and enhance their security is to upgrade the customer to mini keychain remotes.

Then the mini remote goes with the person’s keys in their pocket, or purse and typically brought inside the home every night.

● See the specs below for CORRECT rail lengths

• 7-foot high door                      9 feet, 3 inches
• 7-foot, 3-6 inches                    9 feet, 9 inches
• 7-foot, 6-10 inches                   10 feet, 3 inches
• 8-foot high                                10 feet, 3 inches
• 9 or 10-foot high door             11-12 feet long

Roy Bardowell, CDDC, served as Operations Manager at Guardian Access & Door Hardware until 2012. He has been in the door and operator industry since 1973 and is known as one of the industry’s most experienced operator technicians and trainers. Roy received the IDEA Commitment to Excellence award in 2008 and IDA’s Jerry R. Reynolds Volunteer Service Award in 2017. Contact him at

  1. Brian's picture
    Dec 04, 2017

    Dear Alayne,

    Some gargae door openers have a special control console that can provide this function.  Your Guardian opener is not adaptable to this console,  A less expensive alternative would be to replace the light switch in your carage with a passive infrared motion sensor wall switch.  This switch will recognize a presence in the room/garage and turn on/off lights accordingly.  A garage door opener system works with a set timer, so lights can remain on even after the person has left the garage.  The switch could be purchased at any hardware of store or home center.


  1. Steve's picture
    Jan 30, 2018

    I recently posted complaining about the motor. I found a number for Guardian technical services online and as a last effort I called them. Technical services was great and helped me fix the problem fairly easily with directions over the phone. I’m impressed with corporate but still disappointed in the local installer as since the day they installed the opener they come across as more interested in generating charges than doing what’s right for the customer.

    Thanks to Technical Services!

  1. Shirley Rankin's picture
    Feb 05, 2018

    I'm in New Zealand. If I can't source this for my Guardian 21230DL, I'll have to discard an entire garage door opener which works perfectly well just because it can't receive the signal from the remote.

    I looked for an internet sale on your website but couldn't find it.

    Considering that it will cost $800 to replace the whole door opener unnecessarily, I would really appreciate your help.


  1. Brian's picture
    Feb 11, 2018

    Guardian products can be found in New Zealand at Windsor Doors

    Windsor Doors Auckland

    347 Great South Rd.

    Takanini 2112, Auckland

    P: 09 298 8655

    F: 09 298 0626


    Windsor Doors Christchurch

    Doric Way, Waterloo Business Park


    P: 03 343 3276

    F: 03 343 3761


    Windsor Doors Wellington

    (Incorporating Castle Doors Ltd)

    95 Nelson Street,

    Petone, Wellington

    P: 0800 020 785

    F: 04 589 3986

    Windsor Doors Hamilton Unit 8

    170 Maui Street

    Te Rapa, Hamilton

    P: 07 850 6140

    F: 09 298 0626

  1. Marty Marias's picture
    Mar 01, 2018

    Roy, I have six two button remotes, the black rubber inserts fall out and I have to use a small object to activate the opener. Would it be possible to send me five or six replacements. I would happily pay for them.
    Marty Marias
    310 328-6278
    201 Ruth Ave.
    Venice CA 90291

  1. Jamie's picture
    Mar 24, 2018


    My garage door motor is beeping every 15 minutes. Is this due to my remote battery being low or the motor being low? I'm having trouble locating a batter on the actual motor.

  1. Brian's picture
    Mar 25, 2018

    Hi Jamie,

    A good answer can't be provided without more information.  Please call 1-424-272-6998 and a tech will be able to assess the issue and provide a solution. 

  1. smith's picture
    May 01, 2018

    I read the comment on how a clicker is not universal and will not work on guardian garage doors. Specifically could you please suggest one that will work? Your tech phone number is useless! I've left two messages and not received a return call yet and its been three days. No one ever answers either.

  1. Brian's picture
    May 06, 2018

    Any Guardian remote control listed on the remote controls page on this website will work with any Guardian operator.

    If there are issues reaching technical service please feel free to contact a regional office (also listed on the website).

  1. Sherri's picture
    May 13, 2018

    My garage door will not work with the wall panel unit. The remote control units work and the keypad outside works. Any suggestions?

  1. Brian's picture
    May 14, 2018

    Hi Sherri,

    Is the LED back light on the panel glowing?  Check the wiring first.  The plug on the end of the wire leading from the control banel should be securely plugged into the "wall box" recepticle on the motor head.  Check for any wire shorts due to staples holding the wire to the wall.  Check the wire terminal connections on the back of the panel.. If more help is needed please call 1-424-272-6998.

  1. Robert Johnson's picture
    Jun 29, 2018

    The drive belt on my 3/4 HP Guardian executive series 600SL has broken. How do I get it fixed? I called your 800-989-8769 phone number and the phone company said the number is disconnected so no one answered

  1. Brian's picture
    Jul 04, 2018


    Please call Guardian Tech Service at 424-272-6998 for help.  

  1. Jada's picture
    Aug 12, 2018

    Lost power and opened the garage manually, power came back on the door opened almost completely and stopped. Beeping 20 times checked no lights on. Metered the wires for power, 21.08 tried aligning can't get any LEDs on?

  1. Brian's picture
    Aug 13, 2018

    Dear Jada,

    20 beeps signified a photo-eye misalignment or faliure.  Please call Guardian Tech Service at 1-424-272-6998 to resolve.  Thanks

  1. Clinton's picture
    Jan 05, 2019

    No lights on the photo eyes. I think the logic board is out. Can you help me?

  1. Brian's picture
    Jan 07, 2019

    Hi Clinton,

    If the operator still opens the door and a constant pressure on the push button (PE override) closes the door, then the circuit board is probably not the problem.

    1. Check at the operator head to see if wires are in the 4 photo-eye terminals.  Sometimes installers will twist wires togther and use only 2 of the terminals.  This reduces power to the photo-eyes.  It may work initially, but over time as the wire develops more resisitivity, power declines.

    2. Check the alignment of the eyes.

    3. If LEDs fail to appear, after careful alignement, then replace the phot-eyes.

    4. Call 424-272-6998 for further help.

  1. Clinton 's picture
    Jan 15, 2019

    I have no lights on my photo eyes. I have two garage door openers and tried the logic board in the other opener and the lights would come on. This tells me the logic board is good. Wondering if it might be the transformer.

  1. Brian's picture
    Jan 23, 2019


    If you plug the photo-eyes that do not light-up when plugged into operator A into operator B and they light-up, the eyes are good.  Replace the logic boaed in operator A.

    Call 424-272-6998 for additonal assistance.

  1. Jim Loges's picture
    Apr 02, 2019

    Hi Roy,

    Thank you for the blog. We have a Guardian Pro Series 628 which was installed about two years ago. We have constant problems with the sensors and believe this is cause by glare from the sun since we experience the problems mostly during the day. Are there specific safety sensor sun shields (that's a mouthful) that work with these units? Also, the green light on that side blinks slowly all the time but the door still goes up/down. Is that normal? I thought both lights should be solid.


  1. Brian's picture
    Apr 03, 2019

    Hi Jim,

    There are no stock sun shields for photo-eyes.  Fabricate a shiled from cardboard or an empty paper tube and tape to the red (receiver) photo-eye.  Another trick would be to reverse the position of the eyes, placing the receiver eye on the shaded side (if there is one eye in bright sun and the other in the shade). 

    You are right, both red and green LEDs should be steady.  The flashing green could be due to misalignment or a poor connection at the operator head.  First, check the PE alignment.  If necessary, remove the wing nut holding the sensor for full range of motion.  Next, check the terminal block on the back of the motor head.  The first 4 terminals (L to R) are for photo-eye wires.  Each terminal should have one wire inserted.  At times, installers twist together pairs of wires.  Not using all terminals cuts the ammoun of current avaialble to the sensor and could cause the LEDs to flash.  If these two steps do not work, call 424-272-6998.


  1. Brian's picture
    Apr 30, 2019

    Hi Marty,

    We'll send you some.

  1. Susan's picture
    Jun 19, 2019

    We had a long power outage and when power was restored opener would not open. I pulled the red cord to open manually and now the opener doesn't work at all. It doesn't even seem to be connected. Do I just need to reprogram the opener? Thanks!

  1. Brian's picture
    Jun 24, 2019

    Hi Susan,

    Please call 424-272-6998 for trouble shooting assistance.

  1. THOMAS FLANNERY's picture
    Mar 13, 2020

    I bought a Guardian Garage Door opener and from day 1 it has been temperamental when using the remote to open and close. If i am too close or push the button to long or too short a time. I had the installer return and ask questions, it appears Guardian knows their problem is the RF signal being sent at too rapid a rate or something of the like.
    DOES GUARDIAN HAVE A SOLUTION TO CORRECT YOUR ISSUE? At present i would never recommend this product or ever buy another, my second door will not be replaced with a Guardian.

  1. Brian's picture
    Mar 14, 2020


    Please call tech service at 424-727-6998.  A technician will help you resolve the issue you are having with your radio controls.

  1. Deep Chakraborty's picture
    Apr 25, 2020

    Garage door is stuck and not opening....beeps 10 times

  1. Brian's picture
    Apr 27, 2020

    Hi Deep,

    Please call 1-424-272-6998 and a tech will be able to assess the issue and provide a solution. 

  1. Mike's picture
    May 03, 2020

    Checked the sensors they are solid green and red. When I depress the button it beeps 5x I tried holding down the button no movement. Try resetting the limits it let me reset the up but would not the down beeps 12x any suggestion it is a ,1yr old guardian 6200sl

  1. Brian's picture
    May 03, 2020

    Hi Mike,

    The down relay on the circuit board may be stuck.  Please call 424-272-6998 for troubleshooting assistance.

  1. Rick Ulrich's picture
    May 17, 2020

    Motor is making noise only when opening door. No noise on closing. Is this a motor lube issue or a replace motor issue? Any input appreciated.



  1. GuardianWebAdmin's picture
    May 19, 2020

    Hi Rick,

    Please call 424-272-6998.  The noise could be better described to a tech or he can be allowed to listen to it in order to better assess the issue.  Thanks

  1. Thomas's picture
    Jun 18, 2020

    My green side is frequently blinking, so the door can't open/close. Lens are clean, no obstructions and we've tried adjusting the green side left/right, up/down with no luck. Sensor wiring appears secure. What am I missing??

  1. Brian's picture
    Jun 21, 2020

    Hi Thomas,

    First check to see whether the eyes have been properly wired into the operator head.  There are 4 terminals for photo-eyes.  All 4 must be used in order to provide full power to the eyes.  Lack of power can cause the blinking condition.

    A short in the photo-eye wires can also cause the green LED to blink.  Over time, expansion and contraction due to weather, can cause a staple to break the wire insulation. 

    See this link for more advice:

    Call Guardian Tech Service at 424-272-6998 for more advice.

  1. Paul DiModica's picture
    Oct 13, 2020

    I have the Guardian 615 opener and would like to add the MYQ Smart garage Door opener. Do you know if it is compatible?

  1. Brian's picture
    Oct 13, 2020

    Hi Paul,

    myQ is not compatible with Guardian garage door openers.  The Guardian model V2 Smart Control Kit would be your best option to use to have this feature.

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