Troubleshooting code
Back to all DHK240A(3,4,W)*(0,A)(L,M,H)***4 error codes
Pressure switch fault. 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 Precedent gas heat fault-code table identifies 3 flash as pressure switch failed to open or close, with pressure switch, combustion blower, hose, flue fitting, airflow, or board concerns listed as possible issues.
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.
The Trane Precedent gas heat fault-code table identifies 3 flash as pressure switch failed to open or close, with pressure switch, combustion blower, hose, flue fitting, airflow, or board concerns listed as possible issues.
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.
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.
GreenFlow can review the code, photos, equipment access, and symptoms before scheduling the right next step.
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