Traulsen Discharge Line Sensor Open or Shorted Error Code
The Intela-Traul control reads the discharge line sensor as open or shorted.
Source: TRAULSEN/00213 Traulsen Intela-Traul Alarms Tech Bulletin TTB0013 (07-15).pdf
What does Traulsen Discharge Line Sensor Open or Shorted mean?
This alarm means the controller cannot read a valid signal from the discharge line sensor because its circuit is open or shorted. The discharge sensor monitors hot-gas temperature near the compressor and feeds the system leak detection logic, so a faulty probe can both trigger this alarm and interfere with leak detection. A correct sensor reads about 32.7K ohms at 32F within ten percent.
Symptoms
- Alarm LED illuminated and horn sounding on the control
- Discharge temperature reading missing or implausible
- System leak detection behaving unexpectedly
- Sensor resistance out of the expected range when tested
Common causes
- Discharge line sensor probe disconnected or loosely connected
- Open circuit in the discharge sensor wiring
- Shorted discharge line sensor
- Dislocated or uninsulated probe, or a failed sensor outside the 32.7K ohm range at 32F
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Diagnostic steps
Locate the discharge sensor
Access the discharge sensor mounted on the hot-gas side of the compressor (R and A Series).
Check the connection
Confirm the discharge probe is properly connected and reconnect it if loose.
Test sensor resistance
Disconnect the sensor and place the probe in ice water; at 32F resistance should read about 32.7K ohms plus or minus ten percent.
Verify placement and insulation
Ensure the probe sits close to the compressor before the hot-gas loop and is insulated as required.
Replace a failed sensor
If resistance is out of range or the probe is damaged, replace the discharge line sensor.
When to call a professional
Call a technician if reconnecting and re-placing the probe does not clear the alarm. The discharge sensor must be positioned near the compressor before the hot-gas loop and insulated; getting this wrong skews leak detection. Testing the probe against the 32.7K-ohm spec and replacing it are service tasks that should be done by qualified personnel.
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Other Traulsen Error Codes
Cabinet temperature has risen above the high-temperature alarm setpoint on the Intela-Traul control.
Cabinet temperature has dropped below the low-temperature alarm setpoint on the Intela-Traul control.
The Intela-Traul control detects a cabinet door open longer than the allowed time.
The Intela-Traul control detected an interruption of power to the unit.
The Intela-Traul control detects a refrigeration system leak based on discharge-line temperature behavior.
The Intela-Traul control signals that the condenser coil needs cleaning or that condenser airflow is restricted.
The Intela-Traul control reads the cabinet air sensor as open or shorted.
The Intela-Traul control reads the evaporator coil sensor as open or shorted.
The Intela-Traul control reads the liquid line sensor as open or shorted.
Defrost has terminated by time rather than by temperature for 72 hours on the Intela-Traul control.