A1204 / F1205 fault in WEG CFW900 Drive

A1204 / F1205 Slot B Temperature Warning / Fault Temperature or overtemperature inside the Slot B accessory is high. fault in WEG CFW900 Drive

These codes indicate a Slot B Temperature anomaly. This means the accessory in Slot B is overheating, likely due to high ambient cabinet temperatures.
Cause:

  • Temperature around the inverter is close to or above 60 ºC.

Remedy:

Check and improve enclosure ventilation. Inspect cooling fans or auxiliary cabinet cooling systems. Ensure ambient operating temperature is within limits.