Danfoss Error Code and Repair Guides - 16 Guides
Danfoss industrial controls troubleshooting hub with 16 guides for fault codes, alarms, symptoms, parts checks, and repair decisions.
Use this page when your Danfoss drive, CNC, servo, or controls hardware posts an alarm during production. Start with the exact code, then open the fix guide for overloads, encoder faults, communication alarms, power quality issues, and drive or board failures.
Tip: search the exact brand, model, and alarm together, for example "Danfoss F0001" or "Danfoss overcurrent fault".
Start With These Danfoss Guides
Danfoss FAQ
Where should I start with Danfoss error codes?
Start with the exact Danfoss model and displayed code or alarm, then open the closest guide on this page. Match the symptom, recent service history, and any secondary codes before resetting the equipment or ordering parts.
Do Danfoss fault codes always mean a bad control board?
No. Many Danfoss codes point to airflow, water flow, sensors, wiring, power quality, filters, switches, or operating conditions. Check the simple causes in the guide before replacing an expensive board.
When should I stop troubleshooting a Danfoss fault myself?
Danfoss industrial alarms can involve stored energy, moving machinery, high-voltage drives, servo systems, and production interlocks. Stop and use the repair checklist or compare service options when the guide points to line voltage, machine guarding, stored energy, safety circuits, or repeated faults after a reset.
| Error Code | What It Means | Guide |
|---|---|---|
| Danfoss FC302 Fault Codes | Alarm 14, 29, 38, and 57 | Fix → |
| Danfoss FC102 VLT HVAC Drive Fault Codes | Danfoss FC102 fault-code guide for AL 2, AL 14, AL 17, AL 29, BACnet/Modbus faults, LCP resets, cooling fans, thermistors, and drive checks. | Fix → |
| Danfoss AKC Controller Fault Codes | Complete Guide | Fix → |
| Danfoss VLT 2900 Fault Codes: Complete Guide | Danfoss VLT 2900 VFD fault codes and diagnostics. AL-series alarm codes, causes, and technician-level troubleshooting for VLT 2900 drives. | Fix → |
| Danfoss FC 51 Fault Codes | Danfoss VLT Micro FC 51 alarms 13, 14, 29, 38, and 46. Check motor cables, earth faults, cooling, phase loss, and internal faults. | Fix → |
| Danfoss FC301 Fault AL 14 | Ground Fault Causes & Fix | Fix → |
| Danfoss FC302 Alarm AL 29 | Causes & Fix | Fix → |
| Danfoss RX Controller Fault Codes | Danfoss RX controller guide for sensor, compressor, defrost, communication, relay, and refrigeration control fault diagnostics. | Fix → |
| Danfoss VFD Fault AL 14 | Ground Fault Fix | Fix → |
| Danfoss VFD Fault Codes | FC301, FC302, FC102 Reference | Fix → |
| Danfoss VFD Fault E-Trip | Causes & Fix | Fix → |
| Danfoss VFD Fault OCL | Causes & Fix | Fix → |
| Danfoss VFD Fault OL | Causes & Fix | Fix → |
| Danfoss VFD Fault UL | Causes & Fix | Fix → |
| Danfoss VFD W30 Brake Resistor Overheat | Danfoss W30 means the brake resistor exceeded its thermal limit. Check resistor sizing, wiring, braking duty, FC301/FC302 setup, and ventilation. | Fix → |
| Danfoss VLT Alarm 14 Earth Fault | Danfoss VLT Alarm 14 guide for earth-fault trips, output current leakage, motor insulation, cable damage, grounding, and safe drive testing. | Fix → |