Troubleshooting code
Back to all S9V2C080U5PSC error codes
Open second-stage pressure switch with second-stage gas valve energized. 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 S9V2 Link-enabled operation alarm table identifies E3.5 as an open second-stage pressure switch while the second-stage gas valve is energized without request.
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 S9V2 Link-enabled operation alarm table identifies E3.5 as an open second-stage pressure switch while the second-stage gas valve is energized without request.
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.
Popular cities
Try another nearby city or contact GreenFlow to confirm service availability.
Excellent service from best tech!
Andrey always does a great job.
The repair person came quickly and was super efficient and polite, and showed me what to do next time. He gave my dog a quick pay and was off again.
They quickly identified the issue with the heating system and fixed it efficiently. He explained everything clearly and made sure I understood what was going on. Very professional and reliable, extremely satisfied with the service.
