Skip to content
ELKAR
Mitsubishi Electric · FR-A800Fault Code E.THMWarning

Mitsubishi FR-A800 — E.THM Motor Thermal Overload

Raised when the electronic thermal relay calculates motor overheating. Mechanical load or wrong current setting is the cause.

Updated: 2026-07-05

Symptoms

  • E.THM under long/high load
  • Motor heating
  • Recurs at a specific operating point

Probable Causes

  • Mechanical overload
  • Wrong electronic thermal current (Pr.9) setting
  • Long low-speed operation (reduced fan cooling)

Checkpoints

  • Measure motor current and load
  • Verify the Pr.9 thermal-current setting
  • Review the low-speed operating profile

Solution

If load is normal, correct Pr.9 to the motor nameplate; for continuous low-speed operation an external motor fan is recommended.

Related Products

ABB ACS580Sürücüler (İnverter / VFD)ABB ACS880Sürücüler (İnverter / VFD)Siemens SINAMICS G120Sürücüler (İnverter / VFD)Danfoss VLT AutomationDrive FC302Sürücüler (İnverter / VFD)

Related Faults

Schneider Altivar — OLF Motor OverloadSchneider Electric · Altivar ATV320OLFSiemens SINAMICS G120 — F07011 Motor OvertemperatureSiemens · SINAMICS G120F07011

Facing the same issue?

Send your faulty board to our lab or consult our expert team. Free pre-analysis.

Ask on WhatsAppGet a QuoteSend a BoardAsk Our Expert

+90 543 855 16 44 · info@elkarotomasyon.com