Reviewed by Lukasz Zelezny for the Lester Controls range. Lester Controls manufactures components used across lifts sold under other names. Engineers and technically-minded building managers will find help here identifying the specific Lester Controls part, recognising the way it usually fails, and ordering the correct spare without a second attempt. End-user fault-finding is out of scope; component work is engineer-only.
Quick Diagnosis
Answer up to three questions. We'll point you at the most likely Lester Controls fault on this page — full detail stays visible below either way.
Common Lester Controls Faults
The lester controls lift problems reported most often to UK service desks — expanded in the order owners typically encounter them. Several are resolved by routine Lester Controls maintenance rather than a call-out, and the rest are far quicker to fix when you can describe the symptom precisely to whoever handles your Lester Controls repair.
Identifying a Lester Controls drive or machine in the machine room
Engineer onlyConfirming the Lester Controls drive, motor, or gearless machine fitted to your lift.
Read this through before booking any Lester Controls repair. The answer is often simpler than it looks.
The drive or traction machine of a UK commercial lift is the single most expensive component in the fitting, and identifying it accurately protects the value of every spare and every service decision.
The plate on a Lester Controls machine gives the model designation, serial number and often the maximum load — photograph it in full.
On modern MRL (machine-room-less) lifts the Lester Controls machine is above the shaft rather than in a separate machine room. Either way, only a competent lift engineer should be inside the space.
Building operators should ask their contractor for a photo of the Lester Controls plate at the next visit and file it with the lift's log.
Whatever the outcome, note the date and the symptom in your Lester Controls maintenance record. A clear history makes the next Lester Controls servicing visit quicker.
Lester Controls brake not holding or not releasing
Engineer onlyThe Lester Controls traction brake is showing symptoms of holding failure or drag.
Most people arriving at Lester Controls troubleshooting pages describe the problem in roughly these words.
The brake on a Lester Controls traction machine is a safety-critical component: it must hold the loaded car at the floor with the motor de-energised. Must release cleanly when the drive commands a start.
When a Lester Controls brake fails to hold, the car rolls slightly at every stop and produces the classic levelling error above or below the floor; when it fails to release.
The drive trips on over-current within seconds of the call. Both are engineer-only diagnoses on any Lester Controls machine and both are more and more urgent.
A brake fault is one of the fastest routes from "in service" to "unsafe". Building operators noting the symptom pattern accurately helps the Lester Controls engineer diagnose the fault at the first visit.
Write down what you saw and when. Regular Lester Controls servicing catches most of these early, and good Lester Controls maintenance notes shorten the engineer's diagnosis.
Lester Controls encoder feedback loss
Engineer onlyThe Lester Controls drive has tripped with an encoder or feedback fault.
Before you phone anyone about a Lester Controls repair, work through the description below. The encoder on a Lester Controls traction machine reports position and velocity back to the drive.
It is the reference the drive uses to command the motor.
An encoder fault on a Lester Controls drive shows up either as a specific coded trip on the drive display or as more and more erratic levelling at floors.
Diagnosis is engineer-only; the Lester Controls drive log records the trip and the underlying cause is usually an encoder cable fault, a connector working loose with vibration, or the encoder disc itself contaminated.
Building operators seeing the same Lester Controls trip repeatedly should pass the trip code to the contractor rather than accepting a mains reset as the resolution.
If it becomes a repeat event, treat it as a Lester Controls servicing question rather than a one-off Lester Controls repair; recurring symptoms usually trace back to a missed maintenance interval.
Lester Controls motor overheating
Engineer onlyThe Lester Controls traction motor thermal is tripping the lift out of service.
This symptom accounts for a steady share of the Lester Controls repair enquiries we see each month.
A Lester Controls traction motor has a thermal cut-out that fault-locks the lift when the motor winding temperature exceeds its rated limit. Repeated thermal trips on a Lester Controls motor are always symptomatic.
They can be caused by airflow to the machine or MRL space being blocked, by ambient temperatures in the machine room rising above the design limit in summer, by mechanical drag increasing the load on the motor, or by a fault in the Lester Controls drive that is pulling more current than the motor can shed as heat.
Building operators should check the Lester Controls machine-room airflow is clear and log any recent changes. The underlying cause is a Lester Controls engineer diagnosis. Keep the Lester Controls maintenance paperwork with the lift.
Whoever attends the Lester Controls repair will want to see when the last service was done.
Lester Controls drive tripping on over-current or over-voltage
Engineer onlyThe Lester Controls VVVF drive is showing repeated over-current or over-voltage trips.
This is one of the most common reasons UK owners look up Lester Controls troubleshooting in the first place.
The Lester Controls VVVF (variable-voltage, variable-frequency) drive protects itself and the traction machine by tripping on abnormal current or voltage.
Repeated Lester Controls trips on the same indicator are diagnostic: over-current usually points to a mechanical load fault (brake dragging, guide-shoe seizure), over-voltage to a regenerative-braking issue where the Lester Controls drive can't dump the energy of a descending loaded car quickly enough.
Neither is a building-operator diagnosis. The Lester Controls drive event log is the primary source of truth.
The value of building staff noting the pattern is that it tells the engineer whether to bring parts for the mechanical or the electrical suspect.
Faults in this family are largely prevented by keeping to the Lester Controls servicing schedule, so check the date of your last Lester Controls maintenance visit while the paperwork is out.
Lester Controls traction machine bearing noise or vibration
Engineer onlyThe Lester Controls machine is developing a rumble or vibration that carries into the car ride.
Of every Lester Controls troubleshooting question sent to us. This symptom is among the most frequent.
Bearing wear on a Lester Controls traction machine is characteristically an ageing symptom: the ride quality of the Lester Controls lift gradually degrades, a low-frequency rumble appears on travel that wasn't there at start-up testing, and vibration more and more transmits into the car.
Left alone, bearing wear ends with a machine seizure and a long out-of-service period.
The value of catching it early is huge — a planned Lester Controls bearing service is a fraction of the cost and time of a failed-machine recovery.
Building operators should log ride-quality changes on the Lester Controls lift on the maintenance log rather than waiting for a fault to be reported by users. Add it to the log.
Planned Lester Controls maintenance is always cheaper than reactive Lester Controls repair. The log is what turns a vague complaint into a booked servicing job.
Lester Controls repair
Before booking a Lester Controls repair, separate the symptom from the cause. A lift component that halts mid-travel, one that will not start, and one that starts then stops are three different jobs even when they look identical from the landing. Note which of the three you have, plus the last thing that changed — a power cut, a new floor covering, a delivery knock — and hand that to whoever attends.
Anything behind a cover or panel, in the pit or shaft, or involving doors, gates and interlocks is engineer-only work. Your part of a Lester Controls repair is to check and report: mains power on, isolator on, emergency stop out, nothing in the door threshold, and a written note of the fault code.
What Noise Is Your Lester Controls Lift Making?
Lifts talk. Not eloquently — but a grind, a beep or an ominous silence each means something. Press play, compare, and pick the closest match.
Example sounds are synthesized approximations to help you compare — not recordings of Lester Controls equipment.
Grinding — likely causes on a Lester Controls lift
⚠️ Engineer only- Motor bearing at end of life on a drive unit
- Door-operator gearbox worn out
- Sheave or pulley bearing failure
Grinding from a Lester Controls lift component in service is a bearing or gear reaching end of life — motor, sheave, door-operator gearbox, or drive input.
The correct response from a lift engineer is to spot which unit is the source (bearings and gears each have distinct signatures on a stethoscope), order the correct Lester Controls service part, and plan the shutdown.
This is not a page for end users to work from: any mechanical work on Lester Controls drive. Motor or door components needs manufacturer training and the correct lifting equipment.
Building managers should log the fault and route the Lester Controls part number to their contractor.
What Light Is Your Lester Controls Lift Showing?
Lifts also talk in light. Pick what you can see.
Steady red — on a Lester Controls lift
⚠️ Engineer only- Drive-unit fault LED latched on the controller
- Door-operator fault indicator raised at end-of-stroke
- External enable input from the whole-lift controller withdrawn as a fault
A red lamp that stays on rather than blinking on a Lester Controls lift points to an interrupted safety circuit or a fault the controller is holding.
In practice the trigger is usually something ordinary that the person using the lift can see. Start with the owner-safe checks — confirm the doors close fully. That no stop switch is left operated.
That nothing visible is holding a safety contact open. Should the light go out and normal travel return, no further action is needed. Should it stay on, the fault needs an engineer.
Leave the power on and send your service company a note of the indicator state.
Is It Safe to Keep Using It?
Three questions. Ten seconds. Answer honestly.
When to Call an Engineer
Owner checks stop here. All on this list is for the engineer who maintains your Lester Controls lift. Call them or use the form below:
- Repeat faulting within minutes of a reset.
- Burning smell, smoke, or visible damage to cables or control equipment.
- Water ingress in the pit, machine room or car.
- A car that has travelled beyond its normal range or landing level.
- Doors, gates or interlocks showing intermittent behaviour.
Lester Controls servicing
Ask any provider quoting for Lester Controls servicing what is actually included: number of visits, whether the alarm and emergency lowering are tested each time, whether batteries and consumables are covered, and what the response time is when something fails between visits. Two quotes at the same price often describe very different contracts.
Keep every service sheet. A dated history of Lester Controls servicing tells the next engineer which parts have already been changed, supports any warranty claim, and is the first thing a buyer's surveyor asks for when the property changes hands.
Lester Controls at a glance
Quick reference: how Lester Controls lifts are built, how they show faults, and where the official documentation lives.
- Segment
- Component (controllers)
- HQ / market
- UK
- Key products
- Lift control systems and control panels
- How faults are shown
- Controller event log and fault codes
- Coverage on this page
- System-level
- Platform / ownership
- Fitted across many UK lift brands
- Official code source
- Lester Controls manuals
About Lester Controls
Reviewed by Lukasz Zelezny for the Lester Controls range. Lester Controls manufactures components used across lifts sold under other names. Engineers and technically-minded building managers will find help here identifying the specific Lester Controls part, recognising the way it usually fails, and ordering the correct spare without a second attempt. End-user fault-finding is out of scope; component work is engineer-only.
Lift Troubleshooting is an independent resource and is not affiliated with or endorsed by Lester Controls. See our full disclaimer.
Lester Controls maintenance
Treat Lester Controls maintenance as a short weekly routine: confirm the lift component responds normally from every landing, confirm the alarm is audible where somebody would hear it, and confirm the charge indicator behaves as it always has. Anything outside that pattern goes to your provider rather than into a toolbox.
Nothing in owner-level Lester Controls maintenance involves removing covers, entering the pit or shaft, or adjusting doors, gates or interlocks. If a check cannot be done from the landing with the equipment behaving normally, it belongs to a qualified engineer.
Frequently Asked Questions
Which Lester Controls models does this guide cover?
Lester Controls is a component (controllers) manufacturer active in UK. The ranges most often met in the UK are Lift control systems and control panels.
The fault-finding below is written around the behaviour those Lester Controls ranges share rather than around one model number.
So start here and then confirm your exact model from the rating plate before you quote anything to an engineer.
One thing worth knowing: the reference note for Lester Controls reads "Fitted across many UK lift brands". This can change whose manual actually applies to your machine.
How do I read the fault indication on a Lester Controls component?
On Lester Controls equipment the sign is described as: Controller event log and fault codes.
Codes are not standardised between makers, or even between board generations within Lester Controls, so photograph exactly what you see.
The characters, the lamp colour, the flash pattern — and report that with the model from the plate. Read the sign; do not open the Lester Controls controller or any panel to chase it.
What usually goes wrong first on a Lester Controls component?
The fault this page opens with is "Identifying a Lester Controls drive or machine in the machine room". Confirming the Lester Controls drive, motor, or gearless machine fitted to your lift.
The next most reported Lester Controls symptom is "Lester Controls brake not holding or not releasing".
Work through the safe checks listed against each one, note what you observe, and pass that to a competent lift engineer.
All on this page stops at check-and-report: nothing here asks the maintenance contractor to force a door, move a stalled car, remove a panel or enter a pit or shaft.
Where do official Lester Controls manuals come from?
The authoritative reference for this brand is the Lester Controls manuals. Lester Controls publishes to its own channels and to registered trade accounts rather than openly.
So if you have no account, ask your maintenance contractor to supply the Lester Controls document that covers your fitting.
Our own coverage of Lester Controls is currently rated "System-level", so treat this page as an orientation and the manufacturer's document as the authority.
Can building staff work on Lester Controls components?
No. Every Lester Controls component covered here — doors. Drives, machines, brakes, controls — is engineer-only.
This page exists so you can spot what is fitted and describe a symptom accurately, never. So that anyone outside the trade opens equipment.