What the code means
Err 155.02: Outdoor EEV motor fault
The Trane variable-speed alert table identifies EEV MTR ERR when the outdoor electronic expansion valve electric coil is open or intermittently shorted.
Troubleshooting code
Back to all 4TWV8X48A1 error codes
Trane 4TWV8X48A1 Err 155.02 troubleshooting
Outdoor EEV motor fault. Use this page to document the issue and prepare for service. GreenFlow should handle diagnosis for electrical, refrigerant, lockout, or recurring conditions.
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.
Err 155.02 questions
What does Err 155.02 mean on a Trane 4TWV8X48A1?
The Trane variable-speed alert table identifies EEV MTR ERR when the outdoor electronic expansion valve electric coil is open or intermittently shorted.
What Trane message is associated with Err 155.02?
The Trane source used for this page associates Err 155.02 with "Outdoor EEV motor fault". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.
What system area does Err 155.02 point to?
This code is grouped under electronic expansion valve in the source-backed Trane troubleshooting data.
Which Trane documentation supports this Err 155.02 page?
Source-backed Trane 4T-V8-SF-1G-EN Service Facts variable-speed alert-code table for 4TWV8/4TTV8 outdoor units.
Is Err 155.02 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 Err 155.02 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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