American Standard · Furnace / HVAC
8 flashes Low flame signal
What this code means
A flame is detected but the signal is weaker than the board expects.
Most likely causes
- Dirty flame sensor or igniter
- Insufficient gas pressure
What to try first
Clean the flame sensor with fine sandpaper before assuming a gas pressure issue.
Good news: this one is often fixable without a service call. If it persists after the steps above, have it looked at.
Find the part on Amazon →FAQ
What does American Standard error code 8 flashes mean?
Low flame signal. A flame is detected but the signal is weaker than the board expects.
Can I fix American Standard code 8 flashes myself?
Often, yes. Clean the flame sensor with fine sandpaper before assuming a gas pressure issue.
What causes American Standard code 8 flashes?
The most common causes are: dirty flame sensor or igniter; insufficient gas pressure.
Other American Standard furnace codes
All American Standard furnace error codes →
Other furnace brands: Trane · Carrier · Lennox · Goodman · Amana · Rheem · Bryant · Generic · Nest
This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.