19 Temperature Too Far from Setpoint (Check Alarm)

Thermo King Alarm Code

Description

Corrective Action

Temperature Too Far from Setpoint (Check Alarm) After 75 minutes of operation, supply or return air temperature is not in-range and does not approach setpoint within preset pulldown rate. Indicates: Ice or frost on evaporator coil Low refrigerant charge Air exchange vent open too much Container air leakage (doors open)

Press SUP/RET key to check supply and return air sensor temperatures. COmpare temperatures to evaluate unit cooling capacity and performance.Temperature difference should be 4 C to 6 C. Open evaporator door. Inspect coil for rice or frost and initiate manual defrost if necessary. Check refrigerant charge  NOTE: This alarm can be activated if the supply or return air temperature varies, even if the mean temperature does approach setpoint.