Mitsubishi FR-A800 Error Code E.THT

Mitsubishi PLC & VFD Major Overload

Model: FR-A800 | Code: E.THT

Applicable Systems
MELSEC FX3U MELSEC FX5U FR-A800 FR-A700 MR-J4 iQ-R Motion Controller (R32MTCPU/R16MTCPU)

Symptoms

Inverter overload (thermal) tripped.

Possible Causes

  • Inverter overload
  • Cooling fan failure
  • Inverter undersized

Troubleshooting Steps

  1. Step 1: Check inverter load
    Current within rated range
  2. Step 2: Verify cooling fan operation
    Fan running
  3. Step 3: Verify inverter sizing
    Inverter properly sized

How to Reset

Reset via parameter unit after inverter cools.

Related Mitsubishi Fault Codes

Source: Mitsubishi FR-A800 Instruction Manual, Mitsubishi Electric

Category: PLC & VFD