Smart Lock Not Working? Troubleshooting Steps

Rainbow Locksmith technician troubleshooting a door lock in NYC

When a smart lock stops working, replacing the entire lock should not be the first response. A smart lock combines mechanical locking hardware, batteries, a motor, electronics, a keypad or reader, wireless communication, software, and door alignment. A failure in any one of those areas can produce the same frustrating result: the door does not […]

Dead Smart Lock Battery? What to Do

Rainbow Locksmith technicians servicing electronic door hardware in NYC

A completely dead smart-lock battery can make the keypad go dark, stop app commands, disable fingerprint or code entry, and make the lock look as though the entire electronic system has failed. But a dead battery does not automatically mean the lock itself is broken. The correct recovery method depends on the exact model. Some […]

Door Latch Not Catching? Alignment & Repair Guide

Testing a door lever and spring latch that will not catch in NYC

A door that closes but immediately swings back open usually does not have a “lock problem” in the general sense. More often, the spring latch is failing to enter and hold inside the strike plate. That can happen because the door has sagged slightly, the strike moved, hinge screws loosened, the latch is sticking inside […]

How to Fix Door Latch Misalignment: Step-by-Step Guide

Checking door and frame alignment at the latch on an NYC office door

A misaligned door latch is usually easy to recognize: the latch works normally when the door is open, but when you close the door, it hits the strike plate instead of entering the opening cleanly. The important part is deciding why the latch and strike stopped lining up before you modify either one. The strike […]

Mortise Lock Won’t Turn? Diagnosis & Solutions

Commercial mortise lock with lever trim on a metal door in NYC

A mortise lock that suddenly refuses to turn does not automatically need to be replaced. The problem might be the key. It might be inside the cylinder. The threaded mortise cylinder may be sitting at the wrong depth. The rear cam may be incorrect or out of position. The lock case may be binding. Or […]

Stuck Interior Door Lock Button? Diagnose the Lock Before Forcing It

Interior door lock and knob checked for a stuck privacy button in NYC

A stuck button on a bedroom or bathroom lock can look like a very small problem. Sometimes it is. Other times, the button is only the visible symptom of a failing latch, worn knob or lever chassis, loose hardware, or internal privacy mechanism that is no longer moving correctly. The first thing to understand is […]

Lock Cylinder Fell Out? What to Do Before the Door Becomes Unsecured

Lock cylinder and keys re-secured after coming loose on an NYC door

If the entire key cylinder comes out when you remove your key, that is not normal lock operation. Something that is supposed to retain the cylinder has either loosened, disconnected, broken, been installed incorrectly, or worn enough that the cylinder is no longer securely held inside the lock. The important part is determining what actually […]

Key Turns But Door Won’t Open? Troubleshooting Guide

Key turning in a door lock cylinder while the door stays closed in NYC

A key that will not turn usually points toward the keyway or cylinder. A key that does turn but the door still will not open is a different problem. The cylinder may be rotating without properly operating the bolt. The deadbolt may have retracted while the latch remains stuck. The lock may be working but […]

Frozen Door Lock? How to Thaw & Repair an Apartment Lock Safely

Exterior metal door and lock exposed to winter weather in NYC

A key that suddenly refuses to enter or turn on a freezing morning does not automatically mean the lock has failed. Moisture can enter or condense inside an exposed lock cylinder. When the temperature drops below freezing, that moisture can immobilize the cylinder and make an otherwise functional lock feel completely seized. ASSA ABLOY specifically […]

Swing Door Closer Installation: Professional Tips

Rainbow Locksmith technician adjusting a swing door closer on a glass office door in NYC

A door closer can be installed with every screw perfectly tight and still perform badly. The reason is simple: a closer is not just a box attached to the top of a door. Its performance depends on the relationship between the door width, door weight, closer spring power, mounting geometry, arm position, hinges or pivots, […]