Automatic Door Repair

The technician runs the door through a full cycle in both automatic and manual modes before anything is opened up. How the door behaves through that cycle narrows the fault to one of four groups: the drive and running gear, the sensing and activation package, the controls and power, or the frame and structure the door sits in.

From there it is a matter of confirming rather than guessing — belt tension and carrier condition checked by hand, board and power supply checked at the terminals, detection zones walked and observed, and the opening measured for square where the symptoms point to the frame.

We tell you what failed and what caused it. A carrier set that has worn out in eight months is a symptom of a bent track, and replacing only the carriers puts you back in the same position by the end of the year.

Inside the header the wear items are the motor and gearbox, the drive belt and pulleys, and the encoder and limits that tell the operator where the door is. A stretched or slipping belt makes a door slow, jerky or unable to finish its cycle. A failing motor or gearbox makes it noisy, weak or intermittent, and often only under load.

On swing systems we repair and replace arms, linkage, spindles and the operator body. On revolving doors we service canopy and ring drives, speed control and the night lock. On folding doors we repair hinge and pivot assemblies and the panel hardware.

Where an operator has been undersized for the door from the outset, we say so rather than repairing it a third time.

Worn carriers and hanger rollers make a sliding door drag, bind or come off its track, and a bent or contaminated track will destroy a new set of rollers within weeks.

We replace carriers, hanger and anti-riser rollers, bottom guides and damaged track sections, clean and realign the track and square the opening. Where a panel has derailed, we correct the alignment rather than forcing the panel back on — forcing it is what turns a running-gear repair into a panel replacement.

Floor tracks in high-cycle buildings are cleared of grit and debris as part of the repair, because that is what is grinding the guides down in the first place.

Intermittent faults, doors that reset at random and entrances that are simply dead are traced through the power supply, transformer, control board, encoder and limits, relay board and low-voltage wiring — including the fire alarm interface and the access control connections that can hold a door open or keep it locked.

We repair and replace control boards and logic modules across current and obsolete platforms, and cross-reference discontinued boards to a current equivalent where the original is no longer made.

Where an entrance keeps tripping or resetting, we check the supply and the earth before replacing anything, since a board that fails twice in a year is usually telling you about the circuit rather than about itself.

A surprising share of automatic door faults are structural rather than mechanical. A racked or dropped frame makes a swing operator fight the door on every cycle. A header that has sagged puts the panels out of plumb and wears the carriers unevenly. A threshold that has lifted catches the bottom guide.

We square frames, correct header support, repair and replace thresholds and jambs, and reset the hardware before touching the operator settings — because an operator tuned to compensate for a bent opening is never right for long.