Trane Furnace: 7 Flashes
Code 7 Flashes: Gas valve circuit error
Safety faultShown as: 7 flashes, pause, repeat
Gas valve circuit error. The control has detected a fault in the circuit that drives the gas valve.
Manual wording: “7 Flashes --- Gas valve circuit error”
Documented for: *UH1 / *DH1 condensing furnaces (XR 95 family) and other Trane furnaces using the LED-only integrated furnace control
Likely causes, most common first
- Gas valve circuit error
What you can safely check yourself
- Turn the furnace switch off and leave it off until a technician has looked at it
When to call a technician
Call a technician. Anything involving the gas valve or its wiring is a licensed-tech job.
A Trane furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- Installer's Guide - Upflow/Horizontal, Downflow/Horizontal, Gas-Fired, Direct Vent Condensing Furnaces (18-CD29D1-14-EN) (Trane, *UH1B/*UH1C/*UH1D upflow and *DH1B/*DH1C/*DH1D downflow condensing gas furnaces (XR 95 family; first letter A or T)) · checked 2026-08-25