Amana AMSS920803BN Error Code 7 Flashes: Low Flame Signal
What Does Code 7 Flashes Mean?
Seven flashes on the Amana AMSS920803BN indicate a low flame signal. The furnace is still operating (this is a low-severity, informational-leaning code), but the flame sensor is reading a weaker-than-normal microamp current. It is an early warning: if the signal keeps dropping, the board will eventually fail to prove flame and shut the furnace down.
The flame sensor is a thin rod that sits in the burner flame and passes a small current to ground. As carbon and oxide build up on the rod, the current it can carry falls. The most common cause of seven flashes is exactly this fouling; less often the sensor is mispositioned in the flame, or the flame itself is lazy because of a gas-pressure or combustion-air issue.
This code is the early stage of the same flame-sense problem that produces one flash (code-1, ignition lockout) once the signal drops too low to confirm a flame, and it shares the flame-sense circuit with five flashes (code-5). On this model the fix is classified for a technician, who will clean and reposition the sensor and confirm gas pressure rather than leaving the burner-area work to the homeowner.
What You'll Notice
- The furnace still heats, but the single LED blinks seven times between or during cycles
- Occasional unexpected shutdowns or short cycling may begin to appear
- The problem tends to worsen over weeks as buildup on the sensor increases
- Heating otherwise seems normal at first, so the code is easy to miss
Common Causes
How This Is Diagnosed
A technician measures the flame-sense microamp current to see how far it has dropped, then removes and cleans the sensor rod and re-checks the reading. If the signal is still low, they confirm the sensor is correctly positioned in the burner flame and compare gas pressure and combustion air against the rating plate, adjusting as needed. Because a poor unit or burner ground also lowers the reading, grounding is verified as part of the check.
When to Call a Professional
This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:
- Seven flashes show up even though the furnace is still heating
- The furnace has started shutting down unexpectedly or short cycling
- The code follows recent burner or flame-sensor service
- You want to prevent a full one-flash lockout before cold weather sets in
Frequently Asked Questions
My furnace still heats — can I ignore seven flashes?
It is better not to. Seven flashes mean the flame signal is weakening and the furnace may soon lock out on one flash. Addressing it early avoids a no-heat call at a bad time.
What fixes a low flame signal?
Most often cleaning or repositioning the flame sensor restores the signal; if gas pressure or combustion air is off, that is corrected too. On this model the work is classified for a technician.
Will seven flashes turn into a different code?
Yes. If the signal keeps dropping, the furnace will fail to prove flame and lock out with a single flash (code 1).
Sources
✓ Verified against manufacturer service manual — March 2026