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Back to all DHJ180A(3,4,W)*B(L,H)***4 error codes

Trane DHJ180A(3,4,W)*B(L,H)***4 RTRM LED2 2 Flashes troubleshooting

ReliaTel diagnostic present. 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

RTRM LED2 2 Flashes: ReliaTel diagnostic present

Trane ReliaTel support documents identify two Green System LED2 flashes every two seconds as one or more diagnostics present. The diagnostic can include fan, sensor, compressor lockout, defrost, gas heat, smoke detector, Frostat, communication, static-pressure, or discharge-air-sensor issues depending on the unit configuration.

System area
ReliaTel RTRM controls
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.

RTRM LED2 2 Flashes questions

What does RTRM LED2 2 Flashes mean on a Trane DHJ180A(3,4,W)*B(L,H)***4?

Trane ReliaTel support documents identify two Green System LED2 flashes every two seconds as one or more diagnostics present. The diagnostic can include fan, sensor, compressor lockout, defrost, gas heat, smoke detector, Frostat, communication, static-pressure, or discharge-air-sensor issues depending on the unit configuration.

What should I safely check before scheduling service?

Check thermostat status, filter condition, visible outdoor-unit obstructions, and take photos of the flash pattern and nameplate. Do not open electrical panels or refrigerant-side components.

When should GreenFlow handle this code?

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.

Need help with this code?

GreenFlow can review the code, photos, equipment access, and symptoms before scheduling the right next step.

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