46 Evaporator Coil Temperature Too Low (Check Alarm)

Thermo King Alarm Code

Description

Corrective Action

Evaporator Coil Temperature Too Low codes. (Check Alarm) During Chill or Frozen Mode: Evaporator coil temperature is too low compared to return air temperature under actual operating conditions. Controller initiates defrost if no recent defrost. Indicates: Airflow is blocked in the container Evaporator fans do not operate Fresh air exchange vent open too much on frozen load Defective evaporator coil or return air sensor

Check for sensor or evaporator fan alar Open evaporator door. Inspect coil for ice or frost and initiate manual defrost if necessary. Check for correct evaporator fan rotation and operation. Inspect return air grille and cargo load. Remove any debris or cargo from blocking return air grille. At setpoints below 5 C (41 F), maximum air vent setting is not allowed. Check evaporator coil and return air sensor connections and locations.