American Standard 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: *UD1 / *DD1 and CUB1 / CDB1 fan-assisted gas furnaces with 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 American Standard furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- Installer's Guide - Upflow/Horizontal, Downflow/Horizontal Gas-Fired Furnaces, "Fan Assisted Combustion System" (18-CD19D7-17) (American Standard Heating and Air Conditioning, *UD1A/*UD1B/*UD1C/*UD1D upflow and *DD1B/*DD1C/*DD1D downflow 80% fan-assisted gas furnaces) · checked 2026-08-25
- Installation, Operation, and Maintenance Guide - Upflow Only and Downflow/Horizontal Gas-Fired Furnaces "Fan Assisted Combustion System" (Pub. No. 41-5010-20) (American Standard Heating and Air Conditioning, CUB1A/CUB1B/CUB1C/CUB1D upflow and CDB1A/CDB1B downflow 80% gas furnaces) · checked 2026-08-25