Trane HVAC Error Code 44: How to Fix It

Hard 45-90 minutes for diagnostics; compressor replacement is a multi-hour professional job Medium Severity Verified June 2026
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Error Code
44
Brand
Trane
Product Type
hvac
Severity
Medium
DIY Difficulty
Hard
Estimated Fix Time
45-90 minutes for diagnostics; compressor replacement is a multi-hour professional job
Trane HVAC error code 44 indicates a compressor windings imbalance, meaning the electrical resistance or current draw across the compressor motor windings is uneven or outside the acceptable range. This is typically a sign that the compressor motor is degrading, has a shorted or open winding, or is experiencing electrical supply issues. While this is a medium-severity fault, ignoring it can lead to complete compressor failure and a much more expensive repair.
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Tools You'll Need

How to Fix Error Code 44

  1. Power Down the System Safely

    High-voltage electricity is present in HVAC equipment. Always shut off power at both the disconnect and the main breaker before inspecting internal components. Failure to do so can result in severe injury or death.

  2. Inspect and Reset the System

  3. Check Electrical Supply Voltage

    This step requires measuring live voltage. Only perform this step if you are comfortable and trained in working with live electrical circuits. If in doubt, skip to calling a professional.

  4. Inspect Wiring and Electrical Connections

    Confirm power is fully disconnected before opening the unit and touching any wiring or terminals inside.

  5. Test the Run Capacitor

    Capacitors store a lethal electrical charge even when system power is off. Always discharge the capacitor before touching or testing it. Use an insulated handle tool or a dedicated capacitor discharge tool.

  6. Measure Compressor Winding Resistance

    Ensure the system has been powered off and the capacitor fully discharged before touching compressor terminals. Incorrect measurements can occur if any power remains in the circuit.

  7. Check for Compressor Ground Fault

  8. Evaluate Whether the Compressor Needs Replacement

    Do not attempt to replace the compressor or handle refrigerant yourself. Handling refrigerants without EPA certification is illegal and dangerous.

Parts You May Need

Dual run capacitor or single run capacitor
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Compressor contactor
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HVAC compressor motor
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Compressor hard start kit
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Dual run capacitor or single run capacitor
Check Price on Amazon
Compressor contactor
Check Price on Amazon
HVAC compressor motor
Check Price on Amazon
Compressor hard start kit
Check Price on Amazon
Dual run capacitor or single run capacitor
Check Price on Amazon
Compressor contactor
Check Price on Amazon
HVAC compressor motor
Check Price on Amazon
Compressor hard start kit
Check Price on Amazon
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When to Call a Professional

You should call a licensed HVAC technician immediately if: (1) compressor winding resistance tests show a short, open winding, or ground fault — compressor replacement requires EPA refrigerant certification; (2) supply voltage is abnormal and you need an electrician to evaluate your panel or service entrance; (3) you are not comfortable working around high-voltage electrical components; (4) the error code 44 persists after replacing the run capacitor and confirming clean wiring connections; or (5) the system is under warranty, as DIY repairs may void it. Compressor replacement on a Trane system is a significant repair — get multiple quotes and ask about whether system replacement is more cost-effective, especially on older units.

Frequently Asked Questions

What does Trane error code 44 mean?
Trane error code 44 indicates a compressor windings imbalance. This means the electrical resistance measured across the compressor motor windings is uneven or out of the specified range, which can signal a failing compressor, damaged wiring, a bad run capacitor, or an issue with the electrical supply voltage.
Can I still run my AC with error code 44?
It is not recommended. Running the system with a compressor winding imbalance can cause the compressor to overheat, draw excessive current, and fail completely — which turns a potentially fixable problem into a full compressor replacement. Turn the system off and diagnose the issue as soon as possible.
How much does it cost to fix a Trane error code 44?
The cost depends on the root cause. A run capacitor replacement typically costs $150–$300 including labor. Wiring repairs vary by complexity. A compressor replacement is the most expensive scenario, typically ranging from $1,200 to $2,800 or more depending on the system size and refrigerant type. On older units, full system replacement may be more economical.
Can a bad capacitor cause error code 44 on a Trane system?
Yes. A failing run capacitor is one of the most common causes of error code 44. When the capacitor degrades, the compressor motor struggles to start and run properly, creating uneven current draw across the windings — which the control board interprets as a winding imbalance. Replacing the capacitor is a relatively inexpensive fix and should be one of the first components tested.
Is Trane error code 44 the same as a failed compressor?
Not necessarily. Error code 44 is a warning that the system has detected an imbalance in the compressor windings, but the root cause could be a bad capacitor, loose wiring, low voltage, or an actual failing compressor. A full electrical diagnosis — including winding resistance and ground fault testing — is required to confirm whether the compressor itself has failed or if a simpler component is at fault.

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