Troubleshooting code
Back to all WHK102A(3,4,W)**0***2 error codes
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.
What the code means
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.
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.
Showing services from our catalog
Match supported indoor and outdoor equipment combinations to AHRI certification records for planning and documentation.
View service details
Find the cause of warm air from a central AC system and restore proper cooling where possible.
View service details
Diagnose an air conditioner that runs but does not provide expected cooling.
View service details
Diagnose frequent AC starts and stops involving airflow, controls, electrical parts, sizing, or refrigerant conditions.
View service details
Diagnose condensate drainage, pan, coil, and pump conditions that cause water around an AC system.
View service details
Diagnose an AC system that does not start or respond to the thermostat.
View service detailsTrane 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.
The Trane source used for this page associates RTRM LED2 2 Flashes with "ReliaTel diagnostic present". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.
This code is grouped under reliatel rtrm controls in the source-backed Trane troubleshooting data.
Source-backed Trane Commercial HVAC Help Center light-commercial LED code article for ReliaTel/RTRM and related rooftop control diagnostics.
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 2 Flashes entry before interpreting the fault.
Yes. The documented row connects RTRM LED2 2 Flashes to reliatel rtrm controls. Sensor-related alerts should be interpreted by the exact code and operating mode rather than grouped with unrelated sensor faults.
The Trane source row places this code in a pressure-related system area: ReliaTel RTRM controls. Do not treat a pressure-safety code as a thermostat-only issue.
The source-backed description for this row includes a lockout condition. Record the exact code and avoid repeated reset attempts before the fault history is documented.
Yes. The Trane source row groups this item under defrost operation. The exact code matters because Trane separates different defrost fault patterns and causes.
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.
The Trane source row places this code in a combustion, ignition, limit, flame, or pressure-switch safety context. These codes should be interpreted from the exact equipment board and documented flash pattern.
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.
Popular cities
Try another nearby city or contact GreenFlow to confirm service availability.
Andrey was professional, prompt, smart, thorough and exceedingly pleasant. We are likely switching our current HVAC company to Green Flow.
always available, easy to get a hold of, as a property manager I get lots no heat emergency, usually get to it same day or next day
Green Flow and the people who work there are terrific. Vlad and Andre are excellent. Andre was very helpful. He was punctual, respectful, efficient and knowledgeable. He did not try to sell me something I didn’t need ( as others have done before). I was charged $99 which...
They showed up within an hour of me making the call on a Sunday. They fixed our system and taught us how to replace the fuse in the future. We would definitely call again.
Schedule service
Our team will contact you to confirm the next step.
