American Standard Furnace Code E08
Warning
The flame current the control reads is low but still high enough to keep running. This is an early warning, not a shutdown.
Manual wording: “Flame current is low, but still strong enough to allow operation”
Documented for: A951X condensing and A801X induced draft furnaces with the seven-segment IFC display
Likely causes, most common first
- Flame current is low, but still strong enough to allow operation
- Dirty or degraded flame sensor
- Weak or poorly positioned burner flame
- Marginal grounding
What you can safely check yourself
- Note that the furnace is likely still heating; schedule service rather than treating it as an emergency
When to call a technician
Schedule service before it turns into an ignition lockout. Cleaning or repositioning a flame sensor means opening the burner compartment, which is a technician's 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 and Dedicated Downflow Gas-Fired, Direct/Non-Direct Vent, Single Stage Condensing Furnaces with High Efficiency Motor (88-A951X001-1D-EN) (American Standard Heating and Air Conditioning, A951X040BU3SAB through A951X120DD5SAB single-stage 95% condensing furnaces (Silver 95 family)) · checked 2026-08-25
- Installer's Guide - Upflow/Downflow/Horizontal Left/Right Gas-Fired, Single Stage Induced Draft Furnaces with High Efficiency Motor (88-A801X003-1C-EN) (American Standard Heating and Air Conditioning, A801X026AM2SC through A801X120DM5SC single-stage 80% induced draft furnaces (Silver 80 family)) · checked 2026-08-25