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Back to Trane S9V2C100U5VSB

Trane S9V2C100U5VSB troubleshooting and error codes

Use this table to identify what the visible code may mean and what information to share when scheduling service. Keep checks simple and visible; do not open electrical, refrigerant, gas, or sealed equipment compartments.

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Error-code table

Search codes for S9V2C100U5VSB

Code Meaning System area Safe first step Action
E1.0 Internal failure Integrated furnace control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E2.1 Retry exceeded Ignition and flame sensing Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E2.2 Recycles exceeded Ignition and flame sensing Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E2.3 First-stage gas valve not energized when expected Gas valve control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E3.1 Shorted first-stage pressure switch Pressure switch circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E3.2 Open first-stage pressure switch Pressure switch circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E3.3 Shorted second-stage pressure switch Pressure switch circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E3.4 Open second-stage pressure switch Pressure switch circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E3.5 Open second-stage pressure switch with second-stage gas valve energized Pressure switch circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E4.0 Open high limit Thermal limit and safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E4.1 Open reverse-airflow limit Thermal limit and safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E4.2 Open rollout limit Thermal limit and safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E5.0 Flame sensed when no flame should be present Flame sensing Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E6.1 Reversed voltage polarity Power and grounding Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E6.2 Bad grounding Power and grounding Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E6.3 Igniter failure Ignition circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E7.1 First-stage gas valve energized without request Gas valve control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E7.2 Redundant relay energized when it should be off Redundant relay / HLO output Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E8.0 Low flame sense Flame sensing Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E9.1 Open inducer limit switch Inducer safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E9.2 Open condensate pressure switch Condensate safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E9.3 Condensate lockout Condensate safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E9.4 Furnace control mismatch Control compatibility Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E10.1 VSIM motor-control communication error Motor communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E10.4 VSDI control or motor failure Variable-speed inducer control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E11 Internal gas valve error Gas valve control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E12 Open low-voltage fuse Low-voltage protection Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E13 Blower HP or OEM ID mismatch Blower identification Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E14 Configuration data error Configuration data Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
No model No model number programmed Configuration data Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
Invalid model Invalid model number Configuration data Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E17 Blower motor communication error Blower communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E18 Blower control communication error Blower communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E23 Incomplete menu data Control communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E24.1 ACM/CCM Modbus communication lost Control communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E24.2 CAN communication lost Control communication Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E25 Accelerometer out of bounds Orientation sensor Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E26 Return static pressure transducer out of range Return static pressure transducer Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E27 Return thermistor out of range Return thermistor Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E28 Supply thermistor out of range Supply thermistor Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details

Safety note

What is safe to check before service

These pages are meant to help document the issue, not replace diagnosis. GreenFlow should handle pressure-switch, electrical, refrigerant, lockout, recurring, and warranty-related conditions.

Safe visible checks

  • Thermostat display and settings
  • Filter condition and return-air path
  • Visible outdoor-unit obstruction
  • Photos of the code, unit, and nameplate

Stop and call

  • Repeated lockouts or recurring faults
  • Pressure-switch or sensor faults
  • Electrical odor, unusual noise, or ice buildup
  • Any sealed cabinet, refrigerant, gas, or warranty issue

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Sharad W.

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...

Jack B.

Andrey always does a great job.

Michael C.

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

Anna F.

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.

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