What the code means
A1000AA 2: Low speed MOC communication fault
Trane ODR-SVN003D-EN multi-speed status/fault tables for 5TWX7 heat pumps with ComfortSeek identifies A1000AA display value 2 as low-speed MOC communication fault.
Troubleshooting code
Back to all 5TWX7024A1 error codes
Trane 5TWX7024A1 A1000AA 2 troubleshooting
Low speed MOC communication 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.
A1000AA 2 questions
What does A1000AA 2 mean on a Trane 5TWX7024A1?
Trane ODR-SVN003D-EN multi-speed status/fault tables for 5TWX7 heat pumps with ComfortSeek identifies A1000AA display value 2 as low-speed MOC communication fault.
What Trane message is associated with A1000AA 2?
The Trane source used for this page associates A1000AA 2 with "Low speed MOC communication fault". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.
What system area does A1000AA 2 point to?
This code is grouped under outdoor drive communication in the source-backed Trane troubleshooting data.
Which Trane documentation supports this A1000AA 2 page?
Source-backed Trane ODR-SVN003D-EN multi-speed status/fault tables for 5TWX7 heat pumps with WeatherGuard and ComfortSeek. Local products are matched by documented 5TWX7 base model family.
Is A1000AA 2 related to communication between controls?
The Trane source row identifies this as a communication-related condition. Preserve the displayed code and any companion alert text before clearing or resetting controls.
Does A1000AA 2 involve a control, board, drive, or module?
The Trane source row points to outdoor drive communication. Record the exact code and visible alert text before any reset so the control history is not lost.
What information should be captured for A1000AA 2 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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