41 Supply Air Temperature Too High (Check Alarm)

Thermo King Alarm Code

Description	Corrective Action
Supply Air Temperature Too High (Check Alarm) During Chill or Frozen Mode: Supply air temperature is too high compared to return air temperature under operating conditions. Indicates: Low refrigerant charge Incorrect connection or location of supply or return air sensor Air leakage at supply air sensor cable  Ice or frost on evaporator coil Incorrect evaporator fan operation	Check the refrigerant charge using the “Unit Health Check Procedure” on page 6-5. Check for sensor or evaporator fan alarm codes.  Open evaporator door. Inspect coil for ice or frost and initiate manual defrost if necessary. Check for correct evaporator fan motor rotation and operation. Check supply and return sensor connections and locations.