Trane Furnace Code E2.3
Hard lockout
The control commanded the first-stage gas valve on and the valve did not energize, ten times in a row.
Manual wording: “1st Stage Gas Valve Not Energized When It Should Be exceeded after 10 times”
Documented for: S8B1, S8V2, S9V2 and S9V2-VS furnaces with the seven-segment IFC display
Likely causes, most common first
- First stage gas valve not energized when it should be
- Gas valve or gas valve wiring fault
- Control board output fault
When to call a technician
This is a gas valve or control board fault. Call a technician; never work on a gas valve or its wiring yourself.
A Trane furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- Installer's Guide - Upflow/Downflow/Horizontal Left/Right Gas-Fired, Single Stage Induced Draft Furnaces with High Efficiency Motor (18-CE09D1-1E-EN) (Trane, S8B1A026M2PSAB through S8B1D120M5PSAB single-stage 80% induced draft furnaces) · checked 2026-08-25
- Installer's Guide - Upflow/Horizontal and Downflow Gas-Fired, Direct/Non-Direct Vent, 2-Stage Condensing Variable Speed Furnaces (18-CE01D1-1E-EN) (Trane, S9V2B040U3PSAA through S9V2D120D5PSAA two-stage condensing variable-speed furnaces) · checked 2026-08-25
- Installation, Operation, and Maintenance - Gas-Fired 2-Stage Condensing Variable Speed Furnaces with Variable Speed Draft Inducer (FNR-SVX001B-EN) (Trane, S9V2B040U3VSBB through S9V2D120D5VSBB (S9V2-VS) two-stage condensing variable-speed furnaces) · checked 2026-08-25