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Troubleshooting code

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Trane 4TWV0X24A1 Alert 164.02 troubleshooting

Outdoor EEV migrated open. Use this page to document the issue and prepare for service. GreenFlow should handle diagnosis for electrical, refrigerant, lockout, or recurring conditions.

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What the code means

Alert 164.02: Outdoor EEV migrated open

The Trane variable-speed alert table identifies EEV OPEN ERR when the outdoor EEV appears migrated open and superheat is not at the desired set point.

System area
Electronic expansion valve
Service level
Call GreenFlow

Safe checks before calling

  • Confirm the thermostat is on, set correctly, and calling for heating or cooling.
  • Check the air filter and visible return-air path for obvious airflow restrictions.
  • Look around the outdoor unit for leaves, snow, ice, or other visible obstructions without opening the cabinet.
  • Take photos of the thermostat, outdoor unit, nameplate, and any visible flash pattern before scheduling service.

When to stop and call GreenFlow

Call GreenFlow if the code repeats, the system is locked out, heating or cooling is not restored, there is ice buildup, electrical odor, unusual noise, or any issue involving pressure switches, sensors, wiring, refrigerant, reversing-valve operation, or warranty coverage.

Share the visible code, model and serial number if available, photos, current symptoms, and whether the issue affects heating, cooling, or both.

Alert 164.02 questions

What does Alert 164.02 mean on a Trane 4TWV0X24A1?

The Trane variable-speed alert table identifies EEV OPEN ERR when the outdoor EEV appears migrated open and superheat is not at the desired set point.

What Trane message is associated with Alert 164.02?

The Trane source used for this page associates Alert 164.02 with "Outdoor EEV migrated open". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.

What system area does Alert 164.02 point to?

This code is grouped under electronic expansion valve in the source-backed Trane troubleshooting data.

Which Trane documentation supports this Alert 164.02 page?

Source-backed Trane 4T-V0-SF-1Q-EN Service Facts variable-speed alert-code table for 4TWV0/4TTV0 outdoor units.

Is Alert 164.02 tied to the refrigerant circuit?

The source-backed row points to refrigerant-circuit or refrigerant-control context: Electronic expansion valve. Use the documented code text rather than assuming a single cause such as charge, airflow, or valve position.

What information should be captured for Alert 164.02 before clearing alerts?

Capture the exact code, any displayed alert text, the model and serial number, thermostat or control status, operating mode, symptoms, and photos of the display or LED pattern before the alert history is cleared.

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