True T-23DT - Error E2: Sensor 2 Defect

⚠️ Caution / Monitor Closely
Warning: The information provided here is for educational purposes only. Working with commercial kitchen equipment involves high voltage, gas, and high temperatures. We strongly recommend contacting a certified service technician for any repairs. We are not responsible for any damage or injuries resulting from DIY repair attempts. This information is provided 'as is' without any guarantees of completeness or accuracy.

TLDR

On your TRUE T-23DT unit, error code E2 indicates a defect with Sensor 2, which is typically the evaporator coil sensor. This usually points to a faulty sensor, loose wiring connections, or a short/open circuit. Address this promptly to ensure proper temperature regulation and prevent product spoilage.

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Technical Details

Repair Steps:

  1. Safety First: Before attempting any repairs, always disconnect the TRUE T-23DT unit from its power source to prevent electrical shock.
  2. Locate Sensor 2: Sensor 2 on a TRUE T-23DT typically refers to the evaporator coil temperature sensor. It’s usually clipped directly to the evaporator coil within the refrigerated compartment. You may need to remove an interior panel to access it.
  3. Visual Inspection: Carefully inspect the sensor and its wiring. Look for any visible signs of damage, corrosion, loose connections, or pinched wires. Check for any excessive ice buildup around the evaporator that might be impacting the sensor.
  4. Check Wiring Continuity: Disconnect the sensor from the controller. Use a multimeter to check for continuity in the wiring harness leading to the sensor. Ensure there are no open circuits or shorts between the wires. Wiggle the wires gently while testing to identify intermittent faults.
  5. Measure Sensor Resistance: With the sensor disconnected, measure its resistance using a multimeter. Compare this reading to the manufacturer’s temperature-resistance chart for the specific thermistor used in your TRUE unit. A significant deviation from the expected resistance for the ambient temperature indicates a faulty sensor. Most TRUE sensors are NTC (Negative Temperature Coefficient), meaning resistance decreases as temperature increases.
  6. Inspect Controller Connections: If the sensor and its wiring test good, inspect the connections at the main control board (controller). Ensure all terminals are secure and free from corrosion. Sometimes, a faulty control board input can mimic a sensor error.
  7. Sensor Replacement: If the sensor’s resistance is out of specification or there’s clear physical damage, replace the evaporator coil sensor with a genuine TRUE OEM part. Ensure proper placement and insulation.
  8. Test Operation: After replacing the sensor or fixing any wiring issues, reassemble the unit and reconnect power. Monitor the unit’s operation for proper temperature control and to confirm the E2 error code clears.

Common Questions:

Q: What is the function of Sensor 2 on a TRUE T-23DT?

A: Sensor 2 on a TRUE T-23DT is typically the evaporator coil sensor. Its primary function is to monitor the temperature of the evaporator coil, which is critical for initiating and terminating defrost cycles and ensuring efficient refrigeration system operation.

Q: Can I continue to use my TRUE T-23DT with an E2 error?

A: It is strongly not recommended to continue using the unit with an E2 error. A faulty evaporator sensor can lead to improper defrosting, evaporator coil freeze-ups, or continuous compressor operation, compromising temperature stability and potentially spoiling stored products. It can also lead to increased energy consumption and premature wear on the compressor.

Q: What tools do I need to troubleshoot an E2 sensor defect?

A: To troubleshoot an E2 sensor defect on a TRUE T-23DT, you will typically need basic hand tools (screwdrivers, nut drivers), a multimeter capable of measuring resistance (Ohms) and continuity, and potentially a wire stripper/crimper if wiring repairs are necessary. An accurate thermometer can also be helpful for verifying ambient temperatures.

When to call a technician

Consider calling a certified technician if:

  • The error keeps coming back after you've tried the steps above.
  • You're not comfortable doing the checks or repairs yourself.
  • You notice unusual noise, smell, or behaviour.
  • Equipment is under warranty and you want official service.
  • You need the unit back in service quickly with minimal downtime.

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Other T-23DT Error Codes

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