When an elevator stops between floors or refuses to close its doors, the first thing a facility manager sees isn’t the mechanical failure-it’s a cryptic string of numbers and letters on the controller display. Understanding these elevator error codes is the difference between an expensive emergency service call and a simple, informed conversation with your maintenance provider.
At CED Elevator & Electrical, we specialize in providing the high-quality elevator components and technical support needed to keep vertical transportation moving. Here is your guide to decoding what your elevator is trying to tell you.
1. Decoding the Prefix: F vs. E Codes
Most modern controllers use a standardized “alpha-numeric” system. While every manufacturer (like Otis, Kone, or Schindler) has a unique library, the prefixes often follow a similar logic:
- “F” Codes (Faults): These generally indicate a “hard” fault that has tripped a safety circuit. The elevator will usually remain out of service until it is manually reset.
- “E” Codes (Errors): These are often “soft” errors, such as a door taking too long to close. The system may attempt to reset itself several times before shutting down.
2. Common Error Codes and Their Meaning
While you should always consult your specific elevator controller manual, these three categories cover 80% of building issues:
Door Timing Errors (e.g., “DTO” or Error 20)
- What it means: The “Door Time Open” limit was exceeded. Something is likely blocking the infrared edges or the door track.
- The Fix: Check for debris in the sills or a misaligned door operator component.
Leveling and Position Errors (e.g., “LRV” or Error 50)
- What it means: The elevator doesn’t know exactly where it is in the hoistway. This is often caused by a failure in the selector tape or a faulty floor sensor.
- The Fix: This typically requires a technician to recalibrate the positioning system.
Safety String Interruptions (e.g., Error 90-100)
- What it means: A critical safety switch (like the pit stop switch or the top-of-car stop) has been triggered.
- The Fix: Ensure all emergency stop buttons are pulled out and that no hoistway doors are slightly ajar.
3. When to Call for Parts vs. Service
Interpreting the code is only half the battle. If a code repeatedly points to a specific board or sensor failure, it’s often more cost-effective to perform a phased modernization or part replacement than to pay for repeated “reset” service calls.
Facility Manager Tip: Always take a photo of the error code before you attempt to reset the controller. This allows your elevator parts supplier to verify compatibility for the exact replacement you need.
4. Modern Solutions for Aging Controllers
If your building is plagued by obsolete error codes that even veteran technicians struggle to diagnose, it may be time to look at an electrical system upgrade. Modern micro-processor controllers offer remote monitoring and plain-English diagnostics, taking the guesswork out of facility management.
Get the Parts You Need to Clear the Code
Don’t let a “discontinued” part status keep your building at a standstill. At CED Elevator & Electrical, we pride ourselves on sourcing the most reliable commercial elevator parts to resolve even the most stubborn fault codes.
Are your elevators throwing codes you can’t solve? Contact CED Elevator & Electrical today for technical assistance and fast part fulfillment!