True T-23DT - Error Lo: Low Temperature Alarm

🛑 Critical / Stop Operation
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, the "Lo" error code signifies a low temperature alarm, indicating the cabinet temperature has fallen below the set point or its lower alarm threshold. This often points to a faulty temperature sensor, a malfunctioning electronic controller, or a refrigeration system issue causing the compressor to run excessively. Prompt diagnosis and repair are crucial to prevent product freezing and potential equipment damage.

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Technical Details

Repair Steps:

  1. Verify Actual Temperature: Use a calibrated external thermometer to confirm the actual internal cabinet temperature. Compare this reading with the display and the unit’s set point. If the actual temperature is indeed very low, proceed to investigate the refrigeration system.
  2. Check Temperature Sensor (Thermistor): Locate the temperature sensor inside the cabinet. Inspect its wiring for any signs of damage, corrosion, or loose connections. If accessible, test the sensor’s resistance using a multimeter and compare it to the manufacturer’s specifications for ambient temperature, as a faulty sensor can send incorrect readings to the controller.
  3. Inspect Electronic Controller/Thermostat Settings: Access the electronic control panel. Verify that the temperature set point, differential, and any low-temperature alarm limits are correctly configured according to the desired operating parameters for your T-23DT. An incorrect setting or a malfunctioning controller could trigger the alarm.
  4. Examine Refrigeration System Operation: Observe the compressor’s cycling. If it’s running continuously, investigate potential causes such as a stuck contactor, a faulty defrost timer/termination switch, or an issue with the expansion valve (if applicable) causing excessive cooling. Check for signs of evaporator coil icing, which could indicate a defrost system failure causing the sensor to read inaccurately.
  5. Clean Condenser Coil: Although typically associated with high-temperature alarms, an exceptionally clean and efficient condenser, when coupled with other minor system imbalances or a slightly miscalibrated sensor, could contribute to overcooling if the compressor runs for extended periods. Ensure the condenser coil is free of dirt and debris to allow the system to operate optimally and predictably.

Common Questions:

Q: What does “Lo” actually mean on my TRUE T-23DT?

A: On a TRUE T-23DT, the “Lo” error indicates that the cabinet’s internal temperature has fallen below the lower alarm limit or set point, meaning the unit is running colder than intended.

Q: What are the primary causes for a low temperature alarm on a TRUE T-23DT?

A: The main causes typically include a malfunctioning temperature sensor providing an inaccurate reading, a faulty electronic control or thermostat, or issues within the refrigeration system leading to continuous compressor operation.

Q: Should I continue operating my TRUE T-23DT if it’s showing a “Lo” alarm?

A: No, it’s not advised. Prolonged low temperatures can freeze and damage stored products, making them unusable. Additionally, an underlying system fault causing the overcooling could lead to increased energy consumption or further equipment damage.

When to call a technician

For this error, we recommend calling a certified technician. Do not continue operation or attempt repair yourself.

  • Equipment shows a critical or stop-operation fault.
  • You smell gas, burning, or see smoke or sparks.
  • Error returns after following the steps above.
  • You are not trained to work on this equipment.
  • Warranty or safety could be affected by DIY repair.

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Other T-23DT Error Codes

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