Daikin E425 (USDA1-optional)~E427 (USDA2-optional) E429 (USDA3-optional)~E433 (CTS-optional)

Alarm
Logic		 E425 USDA sensor 1 (USDA1) is not functioning correctly
E427 USDA sensor 2 (USDA2) is not functioning correctly
E429 USDA sensor 3 (USDA3) is not functioning correctly
E433 Cargo temperature sensor (CTS) is not functioning correctly
Possible
Causes
  • Setting are incorrect
  • Device malfunction
Sensor failure / Controller failure / Broken wire / Connector disconnected / short circuit
Trouble
Shooting
  • Check optional function setting mode refer to page 2-19
  • If it is set to "4" or "3'' on USDA setting, it needs to match actual sensor number
  • Check setting is turned OFF when unit has no USDA connection (optional)

  • Check connector CN47 on CPU board, USDA connector and cable is open or short circuit
  • Check components and wiring for open or shorted circuit. Repair as needed

Check the resistance value of each sensor USDA and
Cargo temperature sensor (CTS)

 Sensor is functioning if it matches the resistance and USDA sensor characteristics table (Section 6-8 refer to USDA sensor characteristics table)

  • Caution! There are different USDA sensor characteristics type ''1" and ''2". The condition setting mode option shows the what refer to page 2-22.
Controller
Action		 E425 Alarm display only
E427 Alarm display only
E429 Alarm display only
E433 Alarm display only
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