Bryant 315AAV Error Code Continuous ON: Normal Operation / Standby
What Does Code Continuous ON Mean?
When the status LED in the sight glass of the blower access door glows steadily without flashing, the Bryant 315AAV control is telling you everything is fine. The board has confirmed it has 24VAC power and no faults are stored or active, so it is waiting in standby for the thermostat to call for heat or cooling.
It helps to know the three states this single amber LED can show, because they are easy to confuse. A steady glow is normal standby. A rapid flash means reversed line-voltage polarity (a wiring problem). A pattern of short flashes followed by long flashes is a 2-digit status code reporting a specific fault or event. Only the steady, unchanging light is the 'all clear.'
Because this furnace uses a variable-speed ECM blower and an induced-combustion design, a healthy standby LED confirms the control is alert and monitoring its safety circuits — the limit string, the low-heat and high-heat pressure switches, and the flame-sensing circuit — ready to sequence the inducer, igniter, and blower the moment a call arrives.
What You'll Notice
- The amber LED in the blower-door sight glass glows steadily and does not flash
- The furnace starts and runs normally when the thermostat calls for heat or cooling
How This Is Diagnosed
There is nothing to diagnose for a steady LED — it is confirmation of normal power and standby. If you want to verify the furnace is truly healthy, set the thermostat above room temperature and watch a full cycle: the inducer should start, the igniter should glow, the burners should light, and the variable-speed blower should ramp up and deliver warm air, with the LED returning to steady ON afterward.
- The LED is steady but the furnace still will not respond to a thermostat call — the issue is more likely at the thermostat or its wiring than at the control
- You want a routine inspection or seasonal tune-up scheduled
Frequently Asked Questions
My Bryant 315AAV light is on solid — is something wrong?
No. A steady amber LED is the normal standby indication. It means the control has power and no faults, and the furnace is ready to run when called.
The light is solid but the house is cold — why?
A steady LED confirms the control is healthy, so a no-heat complaint with a solid light usually points to the thermostat, its batteries or wiring, or a setting rather than the furnace board itself.
How do I read the other light patterns?
Steady ON is normal, rapid flashing means reversed line polarity, and a sequence of short then long flashes is a 2-digit status code. Count the short flashes for the first digit and the long flashes for the second.
Sources
✓ Verified against manufacturer service manual — March 2026