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The repair vs replace decision for commercial door hardware follows three rules. Replace when the failure is structural (cracked housing, broken spring, worn bearing). Repair when the failure is service-level (dirty mechanism, loose fastener, misaligned strike). Replace when the unit is past 60% of its design cycle life and the failure is the second one this year. Below are the 12 failure modes facility teams see most, the root cause, the field diagnostic, and the decision matrix. Across the 12, repair beats replace about 40% of the time. The other 60% replacement is cheaper in 5-year total cost of ownership than serial repairs.

The decision tree

Three questions to ask on every hardware failure:

1. Is the failure structural or service-level? Structural means the part is physically broken or worn beyond spec (broken spring, cracked housing, worn cam). Service-level means the part is dirty, misaligned, or has a loose fastener. Service-level usually repairs in 15-60 minutes for $20-100 in parts.
2. Is this the second failure this year? First failure on a 5-year-old closer: repair. Second failure within 12 months on the same unit: replace. The pattern indicates the underlying mechanism is worn out.
3. Is the unit past 60% of its design cycle life? A BHMA Grade 1 cylindrical lock is rated for 1,000,000 cycles. A heavy-use opening at 500 cycles/day reaches 60% at year 3. After that, repair labor is a losing investment.

Run these three questions on every failure. The answer narrows the call.

Failure mode 1: door closer oil leak

Symptom: closer body weeping or pooling oil at the bracket. Closing speed becomes inconsistent over weeks or months.

Root cause: internal seal failure inside the closer body. Usually due to age or hydraulic over-pressure from a kickdown holder or someone forcing the door past back-check.

Field diagnostic: visible oil staining on the closer body, door arm, or floor below. Close speed varies day to day.

Call: replace. Oil leaks are not field-repairable on most modern closers. The internal seal is captive and the cost of disassembly exceeds replacement. Replacement closer runs $150-450 depending on series. For closer selection, see how to choose a commercial door closer.

Failure mode 2: panic device latch wear (latch retracts but does not throw)

Symptom: pushing the panic bar retracts the latch correctly, but releasing the bar does not throw the latch fully. Door does not lock when closed.

Root cause: spring fatigue inside the mechanism, or worn latchbolt cam.

Field diagnostic: remove the dogging cylinder, manually retract and release the latch. Watch for slow or partial throw.

Call: replace the latch mechanism cartridge (most modern panic devices are modular) if the panic is under 5 years old. Replace the full panic device if older or if the latch is on a Grade 2 device that has cycled past spec. Cartridge replacement runs $80-250, full device $350-1,200. Read exit device types: rim vs SVR vs mortise vs CVR.

Failure mode 3: hinge sag and door drop

Symptom: door scrapes the floor or the strike at the latch edge. Top of door pulls away from the head jamb.

Root cause: top hinge has worn or pulled out of the frame. On hollow metal frames, hinge screws sometimes back out over years; on wood frames, screws strip.

Field diagnostic: open the door 90 degrees and observe the gap at top and bottom of the latch edge. If the latch edge is closer to the frame at the bottom than at the top, the top hinge is the culprit.

Call: repair first. Replace short screws with 3" hinge screws into the frame studs (wood frame) or weld a stud and re-tap (metal frame). If hinge knuckle itself is worn (visible play in the pin), replace the hinge. Hinge replacement runs $40-120 per hinge. Read how to adjust spring-loaded hinges complete professional guide.

Failure mode 4: electric strike chatter (buzzes but does not unlock)

Symptom: strike emits a buzzing sound when access control fires, but the keeper does not release. Tenant pushes the door, gets stuck.

Root cause: usually voltage drop at the strike (not the strike itself). Other causes: misalignment between strike and latch, worn solenoid plunger, or stuck keeper.

Field diagnostic: measure voltage at the strike with a multimeter during the trigger event. If voltage drops below the strike's minimum (typically 10VDC on a 12V strike, 20VDC on a 24V strike), the issue is the power supply or wire run. If voltage is correct but the keeper does not release, the issue is the strike.

Call: repair if voltage drop (upgrade power supply, shorten run, increase wire gauge). Replace strike if internal failure. Strike replacement $80-300. Read how to choose an electric strike and how to choose an access control power supply.

Failure mode 5: maglock holding force loss

Symptom: door pulls open with less force than it should. Maglock holds when tested but releases under hand pull.

Root cause: armature plate misaligned with the magnet face. Air gap reduces holding force exponentially.

Field diagnostic: with the maglock energized, run a piece of paper between the magnet and the armature. The gap should be zero or minimal contact. If you can move the paper freely, the alignment is off.

Call: repair. Loosen the armature plate, re-seat against the magnet face, re-tighten. Use the manufacturer-provided alignment shims if available. 30-minute fix on most installations. If the magnet itself fails (uncommon), replace. Read how to choose a magnetic lock maglock.

Failure mode 6: mortise lock spring failure (lever does not return)

Symptom: pushing the lever down works, but the lever does not return to horizontal under spring force.

Root cause: return spring inside the lock body has fatigued or broken. Sometimes the spring cage itself has worn.

Field diagnostic: remove the lock from the door, manually cycle the lever. Listen for the spring engagement; failure is usually obvious.

Call: repair if the lock is a serviceable model (Schlage L9000, Sargent 8200, Corbin Russwin ML2000 all have field-serviceable spring cartridges). Replace if the lock is a budget model or older than 15 years. Cartridge $50-150, full lock $400-900. Read Schlage L9000 vs Sargent 8200 vs Corbin ML2000.

Failure mode 7: cylinder pin wear (key sticks or rotates roughly)

Symptom: key insertion or rotation requires extra force. Eventually, the key will not turn.

Root cause: worn cylinder pins, dirty cylinder, or worn key. On high-use openings (1000+ cycles/day), pins reach the wear limit in 3-7 years.

Field diagnostic: cycle the cylinder with a known-good key. If the new key turns smoothly, the original key is worn. If the new key also sticks, the cylinder pins are worn.

Call: repair. Re-pin the cylinder with new bottom pins (30-80) but the cylinder itself is rebuildable. Read SFIC vs LFIC interchangeable cores explained.

Failure mode 8: door sweep degradation

Symptom: visible gap at the bottom of the door, drafts, or in fire-rated doors, smoke leakage.

Root cause: rubber or vinyl sweep insert has compressed or torn after years of contact with the floor.

Field diagnostic: visual inspection. Most sweeps show a permanent compression set after 5-7 years.

Call: replace the sweep insert (not the full sweep assembly). Most Pemko, NGP, and Reese sweeps have replaceable inserts. $20-60 per sweep. Read how to choose a wrap-around door plate sizing guide for related door-bottom hardware.

Failure mode 9: continuous hinge spreading (door pulls away from frame)

Symptom: the door appears to pull away from the frame along the hinge edge. Often discovered during fire door inspection.

Root cause: continuous hinge fasteners have loosened or stripped. On geared continuous hinges, the gear teeth can wear, but usually the issue is fastener-side.

Field diagnostic: check each fastener along the hinge length. Loose fasteners are usually obvious.

Call: repair if fastener-level. Re-fasten with longer or larger-diameter screws. If the hinge gears themselves are worn, replace the hinge. $200-500 for continuous hinge replacement plus labor. Read continuous geared hinges sizing specs common mistakes.

Failure mode 10: keypad lock battery drain (batteries last weeks not years)

Symptom: batteries deplete in weeks instead of the expected 2-4 years on a standalone keypad lock.

Root cause: usually a sticking solenoid or motor that draws current intermittently. Sometimes a cracked seal allows moisture into the battery compartment.

Field diagnostic: remove batteries, test the motor with a benchtop power supply at rated voltage. Excess current draw indicates a mechanical bind.

Call: replace if the lock is past 5 years old and out of warranty. Repair if newer (manufacturer support typically replaces the motor module). Read Alarm Lock DL2700 vs Schlage FE595 vs Kaba Simplex.

Failure mode 11: panic bar dogging mechanism stuck

Symptom: dogging key turns but the panic bar will not depress and stay down (or vice versa).

Root cause: dogging cam stuck due to dirt, worn cam, or bent dogging key.

Field diagnostic: remove the dogging cylinder cap, inspect cam and pawl. Look for visible wear or debris.

Call: repair. Clean cam, replace dogging cylinder if worn ($30-80 part). Full panic device replacement only if the device is older than 10 years and showing other issues.

Failure mode 12: closer arm bracket loose

Symptom: closer arm rocks at the door or frame mounting point. Closer may seem to work but the door slams or fails to latch.

Root cause: mounting fasteners have backed out, or the bracket has worked loose from impact.

Field diagnostic: with the door at rest, grab the closer arm and check for play at each mounting point.

Call: repair. Replace the fasteners with the next size up, or weld a stud and re-tap if the frame has stripped. 30-minute fix. Read how to install a door closer complete professional installation guide.

5-year TCO of repair vs replace

The decision should be made on 5-year total cost of ownership, not single-event cost.

Strategy	Year 1	Years 2-5 (cumulative)	5-year total
Replace at first failure	$400	$0 (under warranty)	$400
Repair, then replace at second failure	$150 + $400	$0	$550
Serial repair (3 repairs in 5 years)	$150 × 3	$0	$450 + downtime cost

The math favors replacement when the unit is past 60% of design cycle life or when the failure is structural. Repair wins when the unit is fresh and the failure is service-level.

When repair is the right call

Repair beats replace in three patterns:

1. Hardware is under 3 years old. Most warranty repairs are free, and the unit has 70% of its design life left.
2. Failure is service-level (alignment, fastener, debris). Repair labor is 30-60 minutes.
3. Repair part is in stock. Cartridge, spring kit, dogging cylinder. Replacement may require 4-6 week lead time.

When replacement is the right call

Replacement wins in three patterns:

1. Hardware is past 60% of design cycle life and has failed before.
2. Failure is structural (cracked housing, broken spring, worn bearing in a non-serviceable unit).
3. The opening is critical and downtime cost exceeds hardware cost. Lobby entry, mechanical room, life-safety opening.

FAQ

How do I know the cycle count on an existing opening? Estimate based on opening type. Lobby entry: 200-500 cycles/day. Tenant suite entry: 50-200 cycles/day. Mechanical room: 5-20 cycles/day. Multiply by days in service to estimate cumulative cycles.

Are warranties typically transferable? Most commercial hardware warranties run with the product, not the owner. Resale or building transfer typically does not affect warranty. Confirm with the manufacturer at time of purchase.

What is the typical labor cost for a repair? Locksmith labor runs $90-180/hour in most US markets. Most repairs are 30-90 minutes plus parts.

Do I need a locksmith or can in-house staff repair commercial hardware? Most service-level repairs (alignment, fasteners, sweep replacement) are in-house work. Structural repairs (cylinder re-pinning, mortise lock disassembly, panic device cartridge replacement) typically require locksmith training. Read common security mistakes and how to avoid them.

Should I keep replacement parts in stock? For a 100+ door portfolio, yes. Common stock: dogging cylinders, closer adjustment caps, hinge screws (3"), strike plates, sweep inserts, batteries. Total inventory cost $200-500, saves multiple emergency callouts per year.

Next step

If you are managing a portfolio with recurring hardware failures, start the audit by classifying each failure against the 12 modes above. The door closers, exit devices, and mortise locks categories carry both serviceable replacement parts and full-unit replacements. Our commercial desk maintains a same-day shipping stock on the highest-failure items across the major brands.