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Troubleshooting code

Back to all A952V120DD5SB error codes

Trane A952V120DD5SB E18 troubleshooting

Blower control communication failure. 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

E18: Blower control communication failure

The RunTru by Trane A952V error-code table identifies E18 as blower communication failure on the control.

System area
Blower communication
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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Match supported indoor and outdoor equipment combinations to AHRI certification records for planning and documentation.

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Air Conditioner Blowing Warm Air

Find the cause of warm air from a central AC system and restore proper cooling where possible.

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Air Conditioner Not Cooling Repair

Diagnose an air conditioner that runs but does not provide expected cooling.

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Air Conditioner Short Cycling Repair

Diagnose frequent AC starts and stops involving airflow, controls, electrical parts, sizing, or refrigerant conditions.

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Diagnose condensate drainage, pan, coil, and pump conditions that cause water around an AC system.

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Diagnose an AC system that does not start or respond to the thermostat.

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E18 questions

What does E18 mean on a Trane A952V120DD5SB?

The RunTru by Trane A952V error-code table identifies E18 as blower communication failure on the control.

What Trane message is associated with E18?

The Trane source used for this page associates E18 with "Blower control communication failure". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.

What system area does E18 point to?

This code is grouped under blower communication in the source-backed Trane troubleshooting data.

Which Trane documentation supports this E18 page?

Source-backed RunTru by Trane FNR-SVX005A-EN integrated furnace control error-code table for A952V variable-speed furnaces.

Is E18 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 E18 involve a control, board, drive, or module?

The Trane source row points to blower 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 E18 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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