Traulsen Liquid Line Sensor Open or Shorted Error Code
The Intela-Traul control reads the liquid line sensor as open or shorted.
Source: TRAULSEN/00213 Traulsen Intela-Traul Alarms Tech Bulletin TTB0013 (07-15).pdf
What does Traulsen Liquid Line Sensor Open or Shorted mean?
This alarm means the controller cannot read a valid signal from the liquid line sensor because its circuit is open or shorted. The liquid line temperature is monitored on Smart Control units and contributes to liquid-line and shutdown alarm logic, so an invalid reading must be corrected for the control to protect the system properly.
Symptoms
- Alarm LED illuminated and horn sounding on the control
- Liquid line temperature reading missing or implausible
- Liquid line or shutdown alarm status behaving unexpectedly
- Sensor resistance out of the expected range when tested
Common causes
- Liquid line sensor probe disconnected or loosely connected
- Open circuit in the liquid line sensor wiring
- Shorted liquid line sensor
- Failed liquid line sensor reading outside the expected range
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Diagnostic steps
Locate the liquid line sensor
Access the liquid line sensor on the refrigeration circuit per the unit's service documentation.
Check the connection
Confirm the liquid line probe is properly connected and reconnect it if loose or disconnected.
Test sensor resistance
Disconnect the sensor and verify resistance against the Intela-Traul sensor spec of about 32.7K ohms at 32F plus or minus ten percent.
Replace a failed sensor
If resistance is outside the expected range, replace the liquid line sensor.
Confirm alarm clears
After reconnection or replacement, verify the liquid line alarm status returns to normal on the control.
When to call a professional
Call a technician if reconnecting the probe does not clear the alarm or if you cannot meter the sensor against spec. The liquid line sensor feeds liquid-line and shutdown alarm logic, so a wrong reading can mask a real sealed-system problem. Testing and replacing refrigeration-circuit sensors are service tasks best handled 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 discharge line sensor as open or shorted.
Defrost has terminated by time rather than by temperature for 72 hours on the Intela-Traul control.