9 Merlo diagnostic codes on file — with the full diagnosis, repair steps, and field insights open to read free, no signup required.
Disclaimer: General reference information for trained, qualified technicians only. Codes and procedures vary by model, serial number and software version. Always follow the manufacturer's service manual and your site's safety procedures. Use at your own risk. Not affiliated with or endorsed by any manufacturer.
| Code | System | Symptom | Full fix |
|---|---|---|---|
| Code 0233 | Electrical | Boom Functions Locked Out | View fix |
| Code 238 | Safety | Overload Alarm (False) | View fix |
| Code 418 | Electrical | Total Machine Lockout | View fix |
| E03 | Hydraulics | All Boom Functions Disabled | View fix |
| E26 | Safety | Boom Won't Extend | View fix |
| E44 | Safety | Deadman Active | View fix |
| E876 | Auxiliary | Attachment Lock | View fix |
| Error 31 | Hydraulics | Lockout / No Boom Move | View fix |
| SPN 522320 FMI 02 | Safety / ASCS | Hydraulics Cut Out / Red Display Flashing | View fix |
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