The Check Valve Wasn’t the Problem: An Otis Elevator Maintenance Checklist

In September 2022, I approved an elevator repair quote in about thirty seconds. That decision took nine days and roughly $4,600 to undo — maybe $4,300 if I don’t count the after-hours call. I’d have to check the ledger.

Car 2 in a six-story condo building near Piedmont Atlanta had been settling a few inches below the landing overnight. The contractor on call said it was probably the check valve in the hydraulic unit. I signed the work order. He swapped the valve. Nine days later, Car 2 was settling again.

The check valve wasn’t the problem. The leak was at the hydraulic cylinder packing. It would have shown up during a pressure test and a quick look at the pit. I skipped that step because it wasn’t on any checklist I had. That’s on me, not the elevator.

I coordinate elevator service for a group of Atlanta-area properties. I’m not a mechanic. I’m the person who approves quotes, keeps records, and explains to the board why the elevator budget is what it is. Over the last seven years, I’ve made enough expensive mistakes to fill a small binder. This checklist is the part I actually use.

Who should use this checklist

Use this if you are a facility manager, property manager, or condo board member who signs elevator repair authorizations. You don’t need to know how to rebuild a valve. You do need to know when a repair process is moving too fast.

Most of the buildings I look after are Otis equipment. The list applies to them directly; it applies to other manufacturers almost as well. The building that generated this list? That was an Otis elevator near Piedmont Atlanta, and it taught me more than I wanted to learn about hydraulic repairs.

Step 1: Pull the nameplate and service history before you pick up the phone

“Otis elevator” covers a lot of territory. An old traction machine, a hydraulic unit, and a modern Gen2 machine-room-less elevator all carry the same logo but share almost no parts. If the work order just says Otis, the tech is guessing before he arrives.

Ask for a photo of the machine room nameplate and the serial number. Ask what model and revision the quote is based on. If the contractor cannot tell you, that is useful information too.

I once approved a ticket based on a phone description and sent a technician out with the wrong door operator part. The visit turned into a $620 diagnostic bill and two days of avoidable downtime. The nameplate would have been free to check.

Step 2: Walk the landing before you open the machine room

A lot of preventable elevator problems start outside the elevator. Look at the landing doors the same way an inspector would. Is there anything blocking access?

I have heard the sentence “it’s just a screen door” twice, and both times it needed to be removed. If a screen door, security gate, or storm door is installed in front of an elevator landing, it can interfere with the landing door and with emergency access. It may also surprise the code inspector who sees it during the annual test. ASME A17.1, the safety code that most U.S. jurisdictions adopt, is not generous when it comes to barriers in front of hoistway doors.

The rule is simple: no new doors or gates around an elevator landing without the elevator contractor and the local code authority signing off first.

Step 3: If the unit is hydraulic, prove the check valve is the problem before you replace it

A hydraulic elevator that settles slowly when it parks is often diagnosed as a failed check valve. The check valve is a one-way valve that keeps pressurized oil from flowing back into the tank. It is a real failure point. But it is not the only one.

The cylinder packing — the seal where the piston enters the cylinder — can leak too. So can the control valve, and so can a fitting in the piping. A leaking packing usually leaves oil somewhere visible, either in the pit or on the cylinder.

Before you approve a check valve replacement, ask the contractor to do a basic leak test: run the car up, stop the pump, and watch whether the pressure or position holds. Ask for a photo of the pit. A good contractor will take the five minutes. If the quote names a part but offers no test, that is a reason to slow down.

Since then, I follow what my team calls the “Otis gray glasses” rule on hydraulic repairs: no test data, no part. It would have saved the September 2022 invoice.

Step 4: Set rules for what goes into the passenger cab

Passenger elevators move people. They also move furniture, ladders, and a surprising number of objects that should have used the service elevator or the stairs.

One resident in a building I manage asked me, only half joking, “are memory foam mattresses good?” She was deciding whether to let a delivery team put a compressed queen-size mattress into the passenger elevator. The delivery box fits. The problem is what happens if someone cuts the wrapping open inside the cab — memory foam expands, and it does not wait politely for the doors to close.

That exact scenario produced an after-hours service call, a cab full of foam, and a door track that needed cleaning. The fix took about two hours and much more money than an elevator booking policy would have cost. Add a note to your move-in rules: no unboxing in the elevator, no furniture without protection, and no oversized loads without the service elevator.

Step 5: Judge the ride the way residents do

Your elevator contractor checks for code compliance and safety. That is important. But neither of those tells you what a resident feels when the cab arrives.

Does it stop level with the floor, or does everyone step down? Do the doors open at a consistent speed, or do they hesitate and bang? Is the car clean, or does it say the building does not care? Those small signals form a tenant’s impression of the entire property.

The cab is branding. You can’t see the check valve from the lobby, but you can feel a rough stop. Ride your elevators monthly. Make a note of leveling, door behavior, and noise. If something feels worse than it did last month, log it before it becomes an emergency.

The short version

Every expensive mistake I have made on elevator work came from the same habit: trusting a first diagnosis without asking for the evidence behind it.

Before you approve the next repair, do this:

• Photo of the nameplate and serial number.
• A written service history, not a verbal summary.
• A diagnostic test or inspection that matches the symptom.
• A visual check of the pit and landing, especially on hydraulic units.
• A clear policy for what can ride in the passenger cab.
• One ride in the elevator after the work is done — not just a technician’s sign-off.

The point is not to prevent every breakdown. The point is to make sure that when a part fails, you pay for the actual failure and not for someone else’s guess.