The elevator controller with no repair path, still running in thousands of buildings
Most owners think of obsolescence as a date somewhere in the future. It is not a date. It is a spectrum, and your building already sits somewhere on it. The uncomfortable part is that where you sit was decided years ago by a manufacturer's product roadmap, not by how well you have maintained the equipment. Here is how to find out where you are before a board fails and decides for you.
THE SIGNAL
Obsolescence is a spectrum, not a date, and one widely installed platform has no OEM repair path at all today.
We published the Elevator Controller Obsolescence Index this week to put the major control platforms in one table. The headline finding is that obsolescence is not one cliff that everyone falls off on the same day. It is a range. At one end, the Dover DMC and DMC-I families have no OEM parts support today. For the DMC-I the index records no repair path at all, on a legacy base of roughly 80,000 units, with independent support very limited. Those elevators run until a board fails, and then there is no part to buy. At the other end, platforms like Virginia Controls MH3000 and Alpha are non-proprietary and fully field-serviceable. In between sit the big proprietary families, KONE, ThyssenKrupp, Schindler and Mitsubishi, all rated mixed or at-risk: newer generations supported, older ones tightening inside the same product family. That last group is where most owners actually are, and it is the group most likely to be told their equipment is fine right up until it is not.
What this means for you: Find out which controller you have, by name and generation, and write it down. Not the elevator brand, the controller platform. It is on the controller cabinet in the machine room and it should be on your maintenance contract's equipment schedule. Then ask your service provider one question in writing: is this platform still supported by the manufacturer for parts, and if not, what is the repair path when a board fails. Get the answer in writing, because the difference between a planned modernization and an emergency one is the most expensive gap in this industry. If you are on a Dover DMC or DMC-I, you are on borrowed time and should be planning a modernization on your own schedule rather than on the schedule a failed board picks for you.
Source: ElevatorBlueprint, The Elevator Controller Obsolescence Index (2026)
INDUSTRY WATCH
A proprietary controller can restrict the software, the service tools and the parts, which is a decision you make once at purchase and live with for thirty years.
The controller you buy determines who is allowed to work on it later. A proprietary controller may restrict access to software, service tools, diagnostic functions or replacement parts, which quietly narrows the field of companies able to bid your next maintenance contract. Non-proprietary platforms are specified the other way: onboard diagnostics, field-adjustable settings, complete wiring diagrams, service and adjustment manuals, and replacement parts available for the service life of the equipment. If you are specifying a modernization right now, this is the single clause with the longest tail, because it sets your leverage for every renewal after it.
Source: CED Elevator, Controller Modernization and Sourcing Non-Proprietary Systems
Obsolescence is partly a business decision, and buildings are usually not funded for the day it arrives.
Parts go obsolete for several reasons and not all of them are technical. The list includes manufacturing issues, mergers, original equipment manufacturer business strategy, technological advancement and simple discontinuation of a product line. That matters because it means the timing is not purely about your equipment wearing out, and the owner usually learns about it in the form of a proposal. The knock-on effects are the expensive part: sourcing a suitable part is often difficult, time-consuming and costly, and in some cases the owner ends up replacing the entire system. The financial reality is the quiet line in all of this. Buildings are usually not prepared financially for this unexpected cost.
Source: The Elevator Consultants, Understanding Elevator Parts Obsolescence: Challenges and Solutions
THE DEEP CUT
How to work out where your building sits on the obsolescence curve, in about fifteen minutes
You do not need a consultant for the first pass. Go to the machine room and read the controller cabinet: you want the platform name and generation, for example TAC20 rather than just ThyssenKrupp. Photograph the data plate and the controller nameplate. Next, pull your maintenance contract and find the equipment schedule, which should list the same platform; if the contract and the cabinet disagree, that discrepancy is itself worth raising, because your contract is priced against whatever the schedule says. Then check three things against the index. First, status: obsolete, mixed or at-risk, or supported. Second, whether independent support exists, because that is what determines whether anyone other than the incumbent can realistically bid the work. Third, the confidence label, so you know whether the status rests on a published bulletin or on a general market timeline. If you land in obsolete, your next step is a modernization budget line, not a repair strategy. If you land in mixed or at-risk, your next step is the written parts-support question above, before your next renewal rather than after it.
The Elevator Controller Obsolescence Index, with status and confidence by platform
Free tool: the Contract Scanner
Obsolescence and your maintenance agreement are the same conversation. If your platform is at-risk, the contract is what decides who is allowed to touch it, what parts are covered, and how long you are locked in while the parts situation gets worse. Paste your agreement into the Contract Scanner and it flags the clauses that matter, including auto-renewal terms and coverage exclusions. Free, no account needed.
P.S. Want more than a flag? The Decode report is a full line-by-line breakdown of your specific agreement.