43 Return Air Temperature Too High (Check Alarm)

Thermo King Alarm Code

Description	Corrective Action
Return Air temperature Too High (Check Alarm) During defrost: Return air temperature increases above 40 C (104 F). Indicates: Defective return or evaporator coil sensor. Return and evaporator coil sensor connections are reversed.	Check for sensor alarm codes. Check supply and return sensor connections and locations.