Code 237-3019: UM3: Umrichter antwortet nicht auf Kommando %4
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical UM3: Umrichter antwortet nicht auf Kommando %4 alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
von der CC %1 [Cause of error] - Der Umrichter antwortet innerhalb einer vorgegebenen Zeit nicht auf das angegebene Kommando von der CC (Kommando Code ist dezimal angezeigt, aber hexadezimal zu interpretieren) [Error correction] - Steuerung neu starten - Kundendienst benachrichtigen
Source: HEIDENHAIN NC Error Messages — TNC7/640/620/320/128, CNC PILOT 640, MANUALplus 620 (10/2023)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Heidenhain TNC Series CNC Alarms
Heidenhain controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 237-3019 on the TNC Series CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Heidenhain's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4497 Heidenhain TNC Series CNC codes.
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