| Code | Description | Probable Cause | Free Fix / Check | | :--- | :--- | :--- | :--- | | | Drive Overcurrent | Short circuit in motor windings or brake coil. | Measure resistance across motor phases (U,V,W). Check brake release relays. | | TE-3012 | DC Link Overvoltage | Regeneration overload or bad braking resistor. | Check the braking resistor (DBR) for open circuit or cracks. Check incoming AC line voltage. | | TE-4015 | Drive Undervoltage | Mains supply dropout or faulty rectifier. | Check 3-phase input fuses. Measure voltage during building heavy load (HVAC startup). | | DQ-102 | Speed Feedback Loss | Encoder on the gearless machine failed. | Check encoder wiring for chafing. Clean the encoder lens (if optical). | | DQ-880 | Drive Overtemperature | Cooling fan failure or dirty heat sink. | Clean the controller air filters. Verify the cabinet fan (FAN1) spins freely. |

Standard reset procedures can often clear non-fatal errors and reinitialize the system.

Technical Overview: Schindler 5500 Error Code Diagnostics and Troubleshooting

Use this for persistent faults. Press the reset button, wait for the red LED to turn off, then press it again.