Reviewed by Lukasz Zelezny for the ALGI range. ALGI is a component supplier whose parts sit inside lifts wearing badges from Otis, KONE, Schindler, TK Elevator and many others. This page helps engineers and technically-minded building managers identify the ALGI part fitted to their lift, understand its typical failure modes, and order the correct spare first time. It is not a fault-finding sheet for end users; all mechanical work on lift components is engineer-only.
Quick Diagnosis
Answer up to three questions. We'll point you at the most likely ALGI fault on this page — full detail stays visible below either way.
Common ALGI Faults
The algi lift problems reported most often to UK service desks — expanded in the order owners typically encounter them. Several are resolved by routine ALGI 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 ALGI repair.
Identifying a ALGI drive or machine in the machine room
Engineer onlyConfirming the ALGI drive, motor, or gearless machine fitted to your lift.
This is one of the most common reasons UK owners look up ALGI troubleshooting in the first place.
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 ALGI machine gives the model designation, serial number and often the maximum load — photograph it in full.
On modern MRL (machine-room-less) lifts the ALGI 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 ALGI plate at the next visit and file it with the lift's log.
Whatever the outcome, note the date and the symptom in your ALGI maintenance record. A clear history makes the next ALGI servicing visit quicker.
ALGI brake not holding or not releasing
Engineer onlyThe ALGI traction brake is showing symptoms of holding failure or drag.
Of every ALGI troubleshooting question sent to us. This symptom is among the most frequent.
The brake on a ALGI 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 ALGI 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 ALGI 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 ALGI engineer diagnose the fault at the first visit.
Write down what you saw and when. Regular ALGI servicing catches most of these early, and good ALGI maintenance notes shorten the engineer's diagnosis.
ALGI encoder feedback loss
Engineer onlyThe ALGI drive has tripped with an encoder or feedback fault.
Read this through before booking any ALGI repair. The answer is often simpler than it looks. The encoder on a ALGI 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 ALGI 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 ALGI 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 ALGI 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 ALGI servicing question rather than a one-off ALGI repair; recurring symptoms usually trace back to a missed maintenance interval.
ALGI motor overheating
Engineer onlyThe ALGI traction motor thermal is tripping the lift out of service.
Most people arriving at ALGI troubleshooting pages describe the problem in roughly these words.
A ALGI 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 ALGI 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 ALGI drive that is pulling more current than the motor can shed as heat.
Building operators should check the ALGI machine-room airflow is clear and log any recent changes. The underlying cause is a ALGI engineer diagnosis. Keep the ALGI maintenance paperwork with the lift.
Whoever attends the ALGI repair will want to see when the last service was done.
ALGI drive tripping on over-current or over-voltage
Engineer onlyThe ALGI VVVF drive is showing repeated over-current or over-voltage trips.
Before you phone anyone about a ALGI repair, work through the description below. The ALGI VVVF (variable-voltage, variable-frequency) drive protects itself and the traction machine by tripping on abnormal current or voltage.
Repeated ALGI 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 ALGI drive can't dump the energy of a descending loaded car quickly enough.
Neither is a building-operator diagnosis. The ALGI 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 ALGI servicing schedule, so check the date of your last ALGI maintenance visit while the paperwork is out.
ALGI traction machine bearing noise or vibration
Engineer onlyThe ALGI machine is developing a rumble or vibration that carries into the car ride.
This symptom accounts for a steady share of the ALGI repair enquiries we see each month.
Bearing wear on a ALGI traction machine is characteristically an ageing symptom: the ride quality of the ALGI 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 ALGI bearing service is a fraction of the cost and time of a failed-machine recovery.
Building operators should log ride-quality changes on the ALGI lift on the maintenance log rather than waiting for a fault to be reported by users. Add it to the log.
Planned ALGI maintenance is always cheaper than reactive ALGI repair. The log is what turns a vague complaint into a booked servicing job.
ALGI repair
A genuine ALGI repair starts with an accurate description of the fault, not with a part number. Record the error shown on the display or keypad, when it appears, and whether the lift component behaves differently on the way up than on the way down. Engineers quote far more accurately from that detail, and you avoid paying for a diagnostic visit that only repeats what you already know.
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 ALGI 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 ALGI 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 ALGI equipment.
Grinding — likely causes on a ALGI 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 ALGI 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 ALGI service part, and plan the shutdown.
This is not a page for end users to work from: any mechanical work on ALGI drive. Motor or door components needs manufacturer training and the correct lifting equipment.
Building managers should log the fault and route the ALGI part number to their contractor.
What Light Is Your ALGI Lift Showing?
Lifts also talk in light. Pick what you can see.
Steady red — on a ALGI 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
Solid red on a ALGI lift is the controller saying it will not move until an open safety input is closed or a latched fault is cleared.
The usual culprits are everyday ones rather than deep faults inside the drive. Before anything else, confirm the doors close fully. That no stop switch is left operated.
That nothing visible is holding a safety contact open. Cleared red and normal travel means carry on.
Still red means stop calling the lift, leave it switched on, and email the details of what you saw to your service company.
Is It Safe to Keep Using It?
Three questions. Ten seconds. Answer honestly.
When to Call an Engineer
Anything touching the safety chain belongs to a qualified engineer, not the owner. Contact whoever maintains your ALGI lift — or use the form below — when you see:
- Repeat faults that come straight back after a reset.
- Any burning smell, smoke, or obvious damage to wiring or controls.
- Water reaching the pit, the machine room or the inside of the car.
- A car that overshoots the landing or leaves its usual travel range.
- Door, gate or interlock behaviour that is not the same every time.
ALGI servicing
ALGI servicing intervals are set by the installer and by how hard the lift component works: a domestic unit used a few times a day is not on the same schedule as one in constant use. If you have inherited the equipment with a property, ask the incoming provider for the last service sheet before agreeing a plan.
Keep every service sheet. A dated history of ALGI 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.
ALGI at a glance
Quick reference: how ALGI lifts are built, how they show faults, and where the official documentation lives.
- Segment
- Component (hydraulics)
- HQ / market
- Germany
- Key products
- Hydraulic cylinders, valves, power units
- How faults are shown
- Power unit and valve fault indications
- Coverage on this page
- System-level
- Platform / ownership
- Fitted on hydraulic lift installations
- Official code source
- ALGI technical documentation
About ALGI
Reviewed by Lukasz Zelezny for the ALGI range. ALGI is a component supplier whose parts sit inside lifts wearing badges from Otis, KONE, Schindler, TK Elevator and many others. This page helps engineers and technically-minded building managers identify the ALGI part fitted to their lift, understand its typical failure modes, and order the correct spare first time. It is not a fault-finding sheet for end users; all mechanical work on lift components is engineer-only.
Lift Troubleshooting is an independent resource and is not affiliated with or endorsed by ALGI. See our full disclaimer.
ALGI maintenance
The owner's share of ALGI maintenance is observation. Listen for new sounds, watch for a landing stop that is drifting out of level, and note anything that has changed since last week. Reporting a small change early is what keeps it from becoming a call-out.
Nothing in owner-level ALGI 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
Is my own ALGI component covered by this page?
ALGI is a component (hydraulics) manufacturer active in Germany. The ranges most often met in the UK are Hydraulic cylinders, valves, power units.
The fault-finding below is written around the behaviour those ALGI 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 ALGI reads "Fitted on hydraulic lift fittings". This can change whose manual actually applies to your machine.
Where does an ALGI component show its fault code?
On ALGI equipment the sign is described as: Power unit and valve fault indications. Codes are not standardised between makers, or even between board generations within ALGI, 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 ALGI controller or any panel to chase it.
Which ALGI problem comes up most often?
The fault this page opens with is "Identifying a ALGI drive or machine in the machine room". Confirming the ALGI drive, motor, or gearless machine fitted to your lift.
The next most reported ALGI symptom is "ALGI 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.
Is there an official ALGI source for fault information?
The authoritative reference for this brand is the ALGI technical paperwork. ALGI 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 ALGI document that covers your fitting.
Our own coverage of ALGI is currently rated "System-level", so treat this page as an orientation and the manufacturer's document as the authority.
How do I identify which ALGI component is fitted?
The ALGI manufacturer's plate is on the component itself. It is not the badge on the car — a lift wearing one brand's name usually carries ALGI parts inside.
Ask your engineer to photograph the ALGI plate during a planned visit. The car top, machine room and MRL space are engineer-only areas.