870 StarCool Alarm Codes And Actions

870 PTI defrost
Description PTI Defrost Fault
Cause -
Trouble
shooting		 Possible causes:
  • Defective Tevap temperature sensor.
  • Defective Psuc pressure transmitter.
  •  Defective heaters.
  • Defective hot gas valve.
  • Evaporator was fi lled with too much ice.
Accompanied alarms:
  • N/A.
Trouble shooting:
  1. Defrosting is terminated when Tevap rises above +15°C (+59°F). Check Tevap and Psuc sensors according to trouble shooting in alarms AL 123 and AL 207.
  2. The heaters may be defective. Start the heaters in manual mode and see if the current consumption is higher than 5 A per phase else the heaters or the power cables for the heaters may be defective.
  3. The hot gas valve is not working properly and the heaters may be defective. Check trouble shooting for the hot gas valve in alarm AL 844.
  4. See if the evaporator is fi lled with ice (through the inspection holes). Be careful with the evaporators fans!
Criteria Defrost terminated on 45 min. time-out

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