An automatic door that hangs open, bounces back or crawls shut is more than an annoyance. On a shop in the Bullring, a surgery in Edgbaston or a warehouse off the A38, it lets heat out, lets draughts and rain in, and leaves your premises insecure at close. Most closing faults come down to a handful of causes, and some you can check yourself before calling anyone out.
The sensors are the first suspect in nine cases out of ten. Modern sliding and swing doors use a microwave motion sensor to open and an infrared safety sensor to stop the door closing on someone. If the safety sensor sees an obstruction, the door will stay open or reopen. That obstruction is often nothing more than a wet floor sign, a stacked delivery, a floor mat that has curled up, or a build-up of dirt on the sensor lens itself.
Sunlight is another surprising culprit. Low winter sun on a south or west facing entrance can flood an infrared sensor and make it read the doorway as blocked, so a door that behaves all morning may play up every afternoon from about three o'clock. Reflective floors, chrome fittings and glossy Christmas displays can do the same thing.
Before you book a visit, spend five minutes on the basics. Clear everything within about a metre of the opening on both sides, including signage and planters. Wipe the sensor units above the door with a soft dry cloth, as road grime builds up fast on entrances facing busy routes such as the Hagley Road or Stratford Road. Look along the floor track of a sliding door for stones, screws or compacted dirt, and brush it out.
Check the mode switch or key selector. It is remarkably common for a cleaner or new member of staff to knock the door into hold open or exit only mode without realising. Finally, if the door closes but bounces back a few centimetres, something is usually catching, so run your hand along the leading edge and the floor guide for damage. If the door is heavy, erratic or making a grinding noise, stop there and keep people clear of it.
Anything inside the operator housing, including the motor, gearbox, control board and drive belt, should be left to a trained engineer. Under BS EN 16005 and the Equipment and Machinery Regulations, a powered pedestrian door in a commercial setting is treated as a machine, and the person responsible for the building has a duty to keep it safe. A door that fails to close is often a door whose safety system is already compromised, so it is worth getting it looked at rather than propping it open.
Across Birmingham and the Black Country a standard callout during working hours typically runs from around £90 to £180 depending on the company and whether it is a contract customer. Sensor replacement commonly lands between £150 and £350 fitted. A new drive belt or roller set is often in the £120 to £300 range, while a control board or motor on an older operator can push past £500, at which point replacing a unit over fifteen years old can make more financial sense. These are indicative figures and the real cost depends on the make, the age of the door and access.
Most faults build up over months rather than appearing overnight. A sliding door on a busy Birmingham high street can easily complete two to three thousand cycles a day, and the rollers, belt and sensors all wear with use. A planned service every six to twelve months, with heavier traffic doors at the shorter end, lets an engineer catch worn rollers and drifting sensor alignment before the door stops closing altogether.
It also helps to keep a simple log by the door. Note when it misbehaves, what the weather was doing and whether anything was in the doorway. That record makes the fault far quicker to diagnose, and it is useful evidence for your insurer or landlord if the door is on a leased unit.
You can in the short term, but switch it to hold open mode on the selector rather than wedging it, as wedging a sliding door can damage the belt and carriage. Keep in mind it affects heating costs and security, so treat it as a stopgap of a day or two.
That pattern almost always points to low sun hitting the safety sensor. An engineer can adjust the sensor angle, change its sensitivity or fit a sun shield, and it is usually a quick fix once identified.
Most local automatic door companies offer same day or next working day attendance for faults within the city and surrounding areas such as Solihull, Sutton Coldfield and Wolverhampton. Contract customers normally get priority, with emergency response for insecure premises often within four hours.
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