Traulsen Intela-Traul Error Codes
Applies to: Intela-Traul reach-ins. Compiled and paraphrased from two Traulsen manuals: the Master Service Manual, form TR36015, covering Full Size Undercounter, G-Series and R&A refrigerator, freezer, dual-temp and hot food units from 2010 onward, and the Owner's Manual, form TR35743, whose alarm explanations section publishes the display text. Sensor values and thresholds are Traulsen's published figures. Always confirm against the manual for your exact model. Table last updated Aug 14, 2026.
How to read the codes
Traulsen's Intela-Traul control shows SHORT TEXT ALARMS on its three-digit display rather than numbered fault codes: cHI, cLO, SN1, rUn Err and the rest below. The display strings here come from Traulsen's owner's manual; the alarm conditions and the sensor values come from the master service manual, whose own alarm table renders its code column as ICONS that did not survive extraction, so we have not reproduced those symbols and will not guess at a character a technician might act on. Match by the display text or the condition, and confirm any symbol against the manual for your control generation. Two things that are NOT faults: dEF means a defrost cycle is running, and Traulsen refrigerators run an off-cycle defrost about once an hour. One thing worth checking on any inherited box: the AUDIBLE ALARM SHIPS TURNED OFF, so a unit can sit in alarm silently while the text displays. Units made before 2010 use an earlier control with some different parameters.
The codes
| Code | Meaning | Likely causes | Operator-safe steps | Technician work |
|---|---|---|---|---|
| Refrigeration system low charge | The control has detected behaviour consistent with a low refrigerant charge | Leak in the sealed system, or a restriction causing the same symptoms | Note when it appeared and whether the cabinet is still holding temperature; do not keep resetting it | Leak search, charge weight check, superheat 5 to 7F and subcooling 4 to 12F against Traulsen spec |
| cHI | High cabinet temperature: cabinet air has risen above the alarm band and stayed there | Door left open, heavy warm load, dirty condenser, iced evaporator, failed fan, or a genuine refrigeration fault | Check the door seals and that nothing is blocking the evaporator, then clear the condenser filter. Alarm clears when the cabinet returns to range | Condenser and evaporator inspection, sensor verification, then system diagnosis |
| cLO | Low cabinet temperature: cabinet air has fallen below the alarm band | Set point too low, cabinet sensor out of tolerance, or a compressor relay stuck closed | Check the set point has not been altered; move product at risk of freezing | Cabinet sensor ohm test, compressor relay contacts, control parameters |
| Door Open | Door open: a door has been open longer than the control allows | Door genuinely left open, a failed door switch, or a sagging hinge holding the door off the seal | Close the door. If the alarm persists with the door shut, the switch or the hinge is the fault, not the refrigeration | Door switch continuity at the yellow input, hinge and gasket adjustment |
| Electrical Loss | Power loss: the unit lost power and the control is flagging it on return | Supply interruption, tripped breaker, or a loose connection | Press alarm cancel to clear, and CHECK PRODUCT TEMPERATURES before assuming the load is safe | Supply and connection check if it recurs without a known outage |
| Clean Filter | Clean condenser: liquid line temperature reached 140F on R&A series, which Traulsen uses as a dirty-condenser signal | Grease and dust blinding the condenser coil or filter | Clean the condenser coil, which Traulsen schedules every three months. Alarm clears once the coil is clear | Coil clean, then verify liquid line temperature falls; compressor cycles off on high limit at 160F |
| Cabinet sensor open or shorted | The green cabinet air sensor is reading out of range | Failed thermistor, disconnected harness, or a loose pin at the control | Nothing to do at operator level; the unit cannot control temperature properly until it is replaced | A display reading of -40F indicates an open sensor or circuit, 266F a short. All sensors read 32K ohms at 32F within 10 percent |
| Coil sensor open or shorted | The blue evaporator coil sensor is reading out of range | Failed thermistor or harness fault | Expect icing, because defrost termination depends on this sensor | Ohm test at 32F; the control terminates defrost at 45F coil temperature and uses this sensor for fan delay |
| Liquid line sensor open or shorted | The yellow liquid line sensor is reading out of range | Failed thermistor or harness fault | May present as the compressor cycling off early | Ohm test; this sensor triggers the clean-coil alarm at 140F and cycles the compressor off at 160F |
| Discharge line sensor open or shorted | The discharge line sensor is reading out of range | Failed sensor or harness fault | No operator action | Replace the discharge line sensor |
| Defrost terminating by time for 72 hours | Defrost has ended on the timer rather than on coil temperature for three days running, which means defrost is not working properly | Coil sensor out of tolerance, failed defrost heater, open heater relay, or defrost lockouts programmed too close together | Expect a frozen evaporator and rising cabinet temperature. Worth reporting early: this alarm appears BEFORE the box fails | Coil sensor ohm test, defrost heater continuity, purple relay output at the module, and review of defrost lockout parameters |
| SN1 / SN2 / SN3 | Sensor failure, shown on the display | A cabinet air, evaporator coil, discharge line or liquid line sensor has failed. Traulsen does not publish which sensor each number refers to, so the digit alone does not identify the failed part | Nothing to do at this level. The alarm text stays until the sensor is replaced | Read the cabinet air, evaporator coil and discharge line sensor temperatures in the control: -40F means the sensor or circuit is open, 266F means shorted, and a sensor can also fail anywhere between the two. Confirm in an ice bath at 32F, where all three should read about 32k ohms within 10 percent |
| rUn Err | Run error: the compressor has run continuously for more than 24 hours | Doors not sealing, a dirty condenser, low refrigerant charge, or a set point the cabinet cannot reach. Continuous run is usually a load or heat rejection problem rather than a control fault | Check door seals and gaskets and clean the condenser coil | Charge, airflow and set point verification. The text remains until the cause is corrected |
| DEF Err | Defrost error: defrost did not terminate on temperature during a 36 hour period | Coil sensor out of tolerance, an open defrost heater or its relay, or defrost lockouts set so aggressively that defrost cannot run | Check whether defrost lockout windows have been set to cover peak hours | Defrost circuit and coil sensor diagnosis. Distinct from the service manual condition where defrost has been terminating on time rather than temperature for 72 hours |
If this needs a refrigeration technician
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Related: the PM checklist that prevents the most common codes outright, and the operator guides for symptom-first diagnosis.
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