True T-23DT - Error UHi: Supply Voltage High

🛑 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 T-23DT unit, error code UHi signifies that the supply voltage to the refrigeration system is excessively high, exceeding its safe operational limits. This condition poses a significant risk of damaging internal electrical components and will likely activate safety shutdowns. Prompt investigation of the electrical supply and wiring is essential to prevent severe equipment malfunction.

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Technical Details

Repair Steps:

  1. Ensure Safety First: Immediately disconnect the TRUE T-23DT unit from its main power supply by unplugging it or tripping the dedicated circuit breaker. Do NOT attempt any troubleshooting while the unit is powered.
  2. Verify Incoming Voltage: Using a multimeter, carefully measure the voltage at the wall outlet or junction box where the unit is connected. Compare this reading to the unit’s specified voltage requirements (typically 115V AC for T-23DT). If the voltage is significantly above the acceptable range (e.g., consistently over 126V for a 115V unit), the issue is external to the cooler.
  3. Inspect Power Cord and Plug: Examine the unit’s power cord and plug for any visible signs of damage, fraying, burn marks, or loose connections. A damaged cord can sometimes create erratic voltage readings, although high voltage usually originates upstream.
  4. Check Internal Wiring and Connections: With the unit still unplugged, carefully remove the rear access panel to expose the internal electrical components. Visually inspect all wiring connections, especially those leading to the compressor relay, control board, and power transformer, for any signs of loosening, corrosion, or heat damage.
  5. Examine the Control Board: While rare for high voltage directly, a faulty control board could potentially misinterpret voltage signals or, in some cases, regulate power incorrectly. Look for any burnt components or bulging capacitors on the main control PCB.
  6. Consider External Electrical System Issues: If the incoming voltage at the outlet is confirmed to be excessively high, the problem lies within your facility’s electrical infrastructure. This could be due to issues with the building’s main power supply, a faulty generator, incorrect wiring by an electrician, or power fluctuations from the utility company. Consult a licensed electrician for further diagnosis of the building’s power.
  7. Professional Service: If the incoming voltage is correct and all internal visual checks yield no obvious faults, but the error persists upon reconnection, or if any internal components appear damaged, it is critical to call a certified commercial refrigeration technician. High voltage issues can be complex and dangerous to troubleshoot without proper expertise and equipment.

Common Questions:

Q: What are common causes for a “Supply Voltage High” (UHi) error on a TRUE T-23DT?

A: The most common causes include issues with the building’s electrical supply, such as voltage spikes from the utility company, a misconfigured or faulty power generator, incorrect wiring in the facility, or less commonly, a failing internal power component on the unit itself misreporting voltage.

Q: Is it safe to continue operating my TRUE T-23DT unit if it displays a UHi error?

A: No, it is absolutely not safe. High supply voltage can cause severe damage to the unit’s electrical components, including the compressor, control board, and fans, leading to costly repairs or even fire hazards. Disconnect power immediately and do not operate until the issue is resolved.

Q: Can I resolve the UHi error on my TRUE T-23DT without professional help?

A: You can safely perform initial checks like verifying the outlet voltage with a multimeter and inspecting the power cord. However, if the high voltage is confirmed at the outlet or if internal components appear damaged, professional assistance from a licensed electrician or refrigeration technician is highly recommended due to the safety risks and complexity involved with high voltage diagnostics.

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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