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Troubleshooting code

Back to all WHC102HW*(C,G,K,N)A error codes

Trane WHC102HW*(C,G,K,N)A RTRM LED2 1 Blink troubleshooting

Emergency stop open during test mode. 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 1 Blink: Emergency stop open during test mode

The Trane light-commercial LED code article identifies one Green System LED2 blink as emergency stop open when attempting test mode.

System area
ReliaTel RTRM controls
Service level
Call GreenFlow

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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RTRM LED2 1 Blink questions

What does RTRM LED2 1 Blink mean on a Trane WHC102HW*(C,G,K,N)A?

The Trane light-commercial LED code article identifies one Green System LED2 blink as emergency stop open when attempting test mode.

What Trane message is associated with RTRM LED2 1 Blink?

The Trane source used for this page associates RTRM LED2 1 Blink with "Emergency stop open during test mode". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.

What system area does RTRM LED2 1 Blink point to?

This code is grouped under reliatel rtrm controls in the source-backed Trane troubleshooting data.

Which Trane documentation supports this RTRM LED2 1 Blink page?

Source-backed Trane Commercial HVAC Help Center light-commercial LED code article for ReliaTel/RTRM and related rooftop control diagnostics.

Is RTRM LED2 1 Blink 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 RTRM LED2 1 Blink entry before interpreting the fault.

Is RTRM LED2 1 Blink 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.

What information should be captured for RTRM LED2 1 Blink 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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