Amana AMSS920803BN Error Code 7 Flashes: Low Flame Signal
What Does Code 7 Flashes Mean?
Code 7 (7 Flashes) on the Amana AMSS920803BN indicates a low flame signal. Your furnace is still operating, but the flame sensor is reading a weaker-than-normal microamp signal. This is an early warning — if left unaddressed, the signal may drop low enough to cause the furnace to shut down and eventually trigger a lockout (code 1).
The flame sensor is a thin metal rod that sits in the burner flame. It works by detecting a tiny electrical current (measured in microamps) that flows through the flame. When the sensor becomes coated with carbon or oxide buildup, the current it can detect diminishes. A healthy flame signal is typically above 2 microamps; code 7 appears when the signal is still present but approaching the cutoff threshold.
The most common cause is a dirty or oxidized flame sensor rod. Less common causes include the flame sensor being incorrectly positioned in the burner flame, or lazy burner flames from improper gas pressure or insufficient combustion air.
Common Causes
When to Call a Professional
Contact a licensed HVAC technician if:
- Code 7 returns within a few weeks after cleaning the flame sensor
- The flame appears lazy, yellow, or uneven instead of steady blue
- The flame sensor rod appears cracked, bent, or physically damaged
- You notice a gas odor during furnace operation
- The furnace escalates to code 1 lockout despite cleaning
✓ Verified against manufacturer service manual — March 2026