Why will the door open but not close?

The photoelectric sensors are the usual cause. Check that both indicator lights are steady and that nothing obstructs the beam.

How long should an opener last?

Ten to fifteen years is typical. On a door that is kept in balance, many last longer.

Can an opener damaged by lightning or a surge be repaired?

Often, by replacing the control board. If other components were affected, we compare the cost with that of a new unit.

Why has the range of my remote diminished?

A weak battery is the first thing to check. Certain retrofit light bulbs near the unit can also interfere with the receiver.

Do you repair wall-mounted operators?

Yes. Their diagnosis differs from that of rail-mounted units, and we are familiar with both.

Should the opener’s memory be cleared when a house changes hands?

We recommend it. All previous remotes and codes are erased, and the new owner’s are programmed afresh.

Openers

Garage Door Opener Repair in Hartland, Wisconsin

When a garage door stops responding, the opener is the natural suspect. Sometimes it is guilty. Quite as often, it has been overworked by a door that is out of balance, and the opener’s failure is the consequence.

(000) 000-0000

Technician adjusting a garage door mechanism by hand

First step: Test the door by hand
Common remedy: Sensor alignment
Advice given: Repair or replace

Checks worth making before you call

A number of apparent failures have simple explanations, and an owner may rule them out in a few minutes.

Power. Confirm that the unit is plugged in and that its outlet is live. Outlets in garage ceilings are commonly protected by a ground-fault device elsewhere in the garage, which may have tripped.
The lock function. Many wall controls have a lock or vacation setting that disables the remotes. It is easily engaged by accident.
The sensors. Each of the two photoelectric units near the floor has an indicator light. Both should be steady. A flashing or unlit indicator means the beam is obstructed or the units are out of line.
The remote. If the wall control works and the remote does not, replace its battery.
The release. If the motor runs and the door does not move, the trolley may have been disengaged. Operating the unit through a full cycle will usually re-engage it.

If none of these resolves the matter, the fault needs proper diagnosis.

Reading the symptoms

What is observed	The likely explanation
The motor hums and the door does not move	Frequently a broken door spring. Otherwise a failed capacitor or a stripped drive gear.
The door closes, then immediately reopens	Sensors obstructed or misaligned, or the close limit set beyond the floor
The door reverses partway down	Binding in the track, or a door out of balance, registering as an obstruction
The door stops short of closing or opening fully	Travel limits have drifted
The wall control works, the remotes do not	Batteries, programming, or radio interference, sometimes from retrofit light bulbs
The lights flash and nothing else happens	A diagnostic code. The number of flashes identifies the fault.
The motor runs with a grinding sound and the door stays put	A worn drive gear within the housing
The door operates of its own accord	A stuck button on a remote or keypad, or damaged control wiring
Operation is slow or labored in cold weather	Stiffened lubricant and a door requiring more force than the setting allows

The door is examined first

This is the principle on which sound opener repair depends. We disconnect the operator and raise the door by hand. A door in proper balance lifts easily and stays where it is put. A door that is heavy, that sticks, or that hangs unevenly has been imposing loads on the operator that it was never designed to bear.

To repair the operator alone in such a case is to treat the symptom. The new gear or board will fail as the old one did. We therefore correct the door, as described under garage door repair, and then attend to the operator.

To repair the operator alone, when the door is at fault, is to treat the symptom.

The components we repair

Photoelectric sensors. Realigned, rewired, or replaced. The low-voltage wire that connects them runs along the wall near the floor, where it is vulnerable to garden tools, stored goods, and mice.

Drive gears. On many chain- and belt-drive units, a nylon gear transmits the motor’s effort to the drive. It is designed as the sacrificial part, and when it wears the motor runs freely while the door stands still. Replacing the gear assembly restores the unit.

Circuit boards. The control board is sensitive to electrical surges. Boards for current and recent models can be replaced. We recommend a surge protector at the outlet thereafter.

Capacitors. A motor that hums and will not start may need only this small component.

Belts, chains, and trolleys. Chains are tensioned. Belts and worn trolleys are replaced.

Limit and force settings. These drift with time and with the seasons. A force setting raised too high defeats the purpose of the safety reversal and should be corrected.

Wall-mounted operators. Their faults differ somewhat: cable tension monitors, position sensing, and the collar that couples the unit to the shaft.

Controls. Wall stations, remotes, and keypads are reprogrammed or replaced. For a newly purchased house, we suggest clearing the operator’s memory entirely so that no earlier remote will work.

Before and after

A worn drive motor and an operator restored to working order

The before image shows an electric gear motor removed from an operator for examination. The motor and its reduction gear are the working heart of any opener, and when the gear wears or a bearing fails, the unit hums, grinds, or stalls.

The after image shows an operator coupled to the torsion shaft and running as intended, with clean components and nothing out of place. A repair of this sort involves testing the door for balance, replacing the worn drive parts, resetting travel and force, and verifying both safety reversals. The owner is left with an opener that responds reliably and stops when it should.

Before: Worn gear motor removed from an operator — Illustrative comparison using licensed stock photography. It shows the kind of change this service makes and is not a documented customer project.

After: Operator and torsion shaft in clean working order — Illustrative comparison using licensed stock photography. It shows the kind of change this service makes and is not a documented customer project.

Whether to repair or replace

Our inclination is to repair any operator that has useful life remaining. A unit under ten or twelve years old with a single failed component is nearly always worth repairing.

Replacement is the better course in a few circumstances.

The unit has no photoelectric sensors. Operators manufactured before 1993 were not required to have them. For reasons of safety, such a unit should be retired.
Parts are no longer supplied. Boards and gears for older models become unobtainable.
Several components have failed together. A board, a gear, and a pair of sensors on a unit twenty years old will cost most of the price of a new one.
The owner wants what the old unit cannot provide. Battery backup, connected control, and the quiet of a direct-current motor cannot be added to an old alternating-current chain drive.

We give the cost of both courses and leave the decision with the owner. Replacement is described under garage door opener installation.

The two safety systems

Every operator fitted since the early 1990s has two independent means of preventing a closing door from causing harm, and both should be tested periodically.

The first is the photoelectric beam across the opening. If it is interrupted while the door is closing, the door must stop and reopen.

The second is contact reversal. If the closing door meets an obstruction, it must reverse. The accepted test is to lay a two-by-four flat on the floor in the path of the door. On touching it, the door should return to the open position.

We test both on every visit, whatever the reason for the call. A door that fails either test should not be closed with the operator until the fault is corrected.

Operators in a Wisconsin winter

Cold weather exposes any weakness in an operator.

Lubricant on the rail and within the gear housing thickens, and the motor must draw more current to do the same work. The door stiffens for the same reason. An operator whose force was set on a mild day may read the added resistance of a January morning as an obstruction, and reverse. The proper remedy is to service the door and rail and then reset the force correctly. Raising the force to its maximum conceals the fault and compromises the safety reversal.

Frost can lift a concrete floor by a fraction of an inch, which is enough to move a sensor bracket out of alignment. Low afternoon sun in December may shine directly into a sensor on a west-facing door and hold the door open until the sun moves on.

Ice storms and high winds interrupt the supply. Where the garage is the principal way into the house, an operator with battery backup is a sensible provision, and it is one of several items discussed under garage door opener accessories.

Noise

An operator that has become louder is usually signaling wear: a slack chain, a dry rail, a worn gear, or loosened mounting. An operator that has always been loud is probably a chain drive doing what chain drives do. Where vibration is transmitted into a room above, isolating mounts between the unit and its hangers will reduce it considerably.

Questions and answers

Questions about opener repair

Why will the door open but not close?: The photoelectric sensors are the usual cause. Check that both indicator lights are steady and that nothing obstructs the beam.
How long should an opener last?: Ten to fifteen years is typical. On a door that is kept in balance, many last longer.
Can an opener damaged by lightning or a surge be repaired?: Often, by replacing the control board. If other components were affected, we compare the cost with that of a new unit.
Why has the range of my remote diminished?: A weak battery is the first thing to check. Certain retrofit light bulbs near the unit can also interfere with the receiver.
Do you repair wall-mounted operators?: Yes. Their diagnosis differs from that of rail-mounted units, and we are familiar with both.
Should the opener’s memory be cleared when a house changes hands?: We recommend it. All previous remotes and codes are erased, and the new owner’s are programmed afresh.