Traulsen Coil Sensor Open or Shorted Error Code
The Intela-Traul control reads the evaporator coil sensor as open or shorted.
Source: TRAULSEN/00213 Traulsen Intela-Traul Alarms Tech Bulletin TTB0013 (07-15).pdf
What does Traulsen Coil Sensor Open or Shorted mean?
This alarm indicates the controller cannot read a valid signal from the evaporator coil sensor because its circuit is open or shorted. The coil sensor is used for defrost termination and coil monitoring, so a bad reading can disrupt defrost behavior. A correct sensor reads about 32.7K ohms at 32F within ten percent.
Symptoms
- Alarm LED illuminated and horn sounding on the control
- Coil temperature reading missing or implausible
- Defrost cycles not terminating correctly
- Sensor resistance out of the expected range when tested
Common causes
- Coil sensor probe disconnected or loosely connected
- Open circuit in the coil sensor wiring
- Shorted coil sensor
- Failed coil sensor reading outside the 32.7K ohm range at 32F
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Diagnostic steps
Locate the coil sensor
Gain access to the coil sensor inserted on the return-air side of the evaporator coil.
Check the connection
Confirm the coil sensor probe is properly connected and reconnect it if loose or disconnected.
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.
Replace a failed sensor
If resistance is outside that range, replace the coil sensor.
Confirm correct placement
On freezer models center the sensor about two inches from the top through the coil; on refrigerator models mount it on top of the coil.
When to call a professional
Call a technician if reconnection does not clear the alarm or if you cannot meter the probe against the 32.7K-ohm spec. Coil-sensor placement differs between freezer and refrigerator models, and incorrect placement affects defrost termination. Accessing the evaporator coil, testing in an ice-water bath, and replacing the sensor 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 discharge line 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.