400 StarCool Alarm Codes And Actions

400  Mevap 1 overheat
Description Evaporator Motor 1 Overheat
Cause Indication of an overheated motor or a loose thermistor cable connection
Trouble
shooting		 Possible causes:

  • Evaporator motor 1 defective.
  • Cable for measuring evaporator motor 1 overheat defective.
  • Main controller defective.
  • Damage on cable for Mevap 1

Trouble shooting:

  1. Try to correct the error by uploading the latest software version to the controller.
  2. Turn off unit! Open inspection hatch and see if the evaporator fan can turn freely. If it cannot turn, remove ice or replace the motor. If the motor is hot, it may be overloaded and jammed or defective.
  3. If the cable for Mevap1 by inspection is defective, if unable to repair cable, replace it.
  4. Disconnect the wires for Mevap1 on the main controller according to the wiring schematics inside the control cabinet.
  5. Measure the resistance in the cable. If the resistance is more than 1 MΩ, the cable or the motor is defective and should be replaced. If the resistance is less than (<) 5 kΩ, the cable and motor should be OK.
  6. Turn unit on again. Measure the voltage across the connector for Mevap1. It should be between 4.80 V DC and 5.20 V DC.

a) If the voltage is inside the above range, connect cable again. Measure the voltage across the thermistor and check the voltage. If the voltage is less than (<) 2.5 V DC, the measurement is OK. If the alarm after 30 sec. is still active in the display, the main controller is defective - replace main controller.

b) If the voltage is outside the range, main controller is defective or another error might affect the voltage. Check other alarms before replacing main controller.
Criteria Value above high alarm limit 10K Ohm.
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