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Trane A951X100CU5SA 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 A951X100CU5SA

Code Meaning System area Safe first step Action
E01 Internal control failure Integrated furnace control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E2.1 Retry exceeded; flame never sensed Ignition and flame sensing Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E2.2 Recycles exceeded; established flame was lost 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
E04 Open limit circuit Thermal limit and safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E05 Flame detected when it should not 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 relay or open igniter fault Ignition circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E7.1 Gas valve energized when it should be off Gas valve control Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E08 Low flame current Flame sensing Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E09 Open inducer limit or condensate switch Inducer or condensate safety circuit Record the flash pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
E11 Internal gas valve relay or 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

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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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

Jahangir R.

They were very organized to communicate and be on time to come to look at my air condition to fix it.

Randy J.

Thanks to Andrey for an amazingly quick response to my request for a service call. He diagnosed and fixed my issue within 24 hours of my asking for help. Excellent service. Thanks.

Anna G.

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.

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