Troubleshooting code
Back to all 5WCZ5060A4 error codes
Fault B or C defrost condition. 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
The Trane Impack packaged-unit LED diagnostic table identifies 3 flashes per second as Fault B or Fault C, including excessive timed defrosts, stuck switch-over valve, sensor, fan, TXV, or charge-related conditions listed in the table.
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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View service detailsThe Trane Impack packaged-unit LED diagnostic table identifies 3 flashes per second as Fault B or Fault C, including excessive timed defrosts, stuck switch-over valve, sensor, fan, TXV, or charge-related conditions listed in the table.
The Trane source used for this page associates Defrost 3 Flash/Sec with "Fault B or C defrost condition". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.
This code is grouped under demand defrost control in the source-backed Trane troubleshooting data.
Source-backed Trane PKGR-SVX002C-EN diagnostic tables for 5WCZ Impack packaged heat-pump units. Rows are applied to local Impack packaged records at the family level.
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 Defrost 3 Flash/Sec entry before interpreting the fault.
Yes. The documented row connects Defrost 3 Flash/Sec to demand defrost control. Sensor-related alerts should be interpreted by the exact code and operating mode rather than grouped with unrelated sensor faults.
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 source-backed row points to refrigerant-circuit or refrigerant-control context: Demand defrost control. Use the documented code text rather than assuming a single cause such as charge, airflow, or valve position.
The Trane source row points to demand defrost control. Record the exact code and visible alert text before any reset so the control history is not lost.
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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