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Trane TAMXA0C42V41 Red 9 Flash troubleshooting

Frost issue. 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

Red 9 Flash: Frost issue

Trane AHR-SVX007C-EN red LED fault-code table for 5TAMX variable-speed air handlers identifies 9 flashes as a frost issue.

System area
Frost protection
Service level
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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.

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Red 9 Flash questions

What does Red 9 Flash mean on a Trane TAMXA0C42V41?

Trane AHR-SVX007C-EN red LED fault-code table for 5TAMX variable-speed air handlers identifies 9 flashes as a frost issue.

What Trane message is associated with Red 9 Flash?

The Trane source used for this page associates Red 9 Flash with "Frost issue". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.

What system area does Red 9 Flash point to?

This code is grouped under frost protection in the source-backed Trane troubleshooting data.

Which Trane documentation supports this Red 9 Flash page?

Source-backed Trane AHR-SVX007C-EN MCB and red LED fault-code tables for 5TAMX variable-speed air handlers.

Is Red 9 Flash an LED or flash-pattern code?

Yes. The Trane source row for this item is based on a displayed LED or flash pattern. Count the pattern exactly and compare it with the documented Red 9 Flash entry before interpreting the fault.

What information should be captured for Red 9 Flash 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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