Bryant 315AAV Error Code 41: Blower Motor Fault
What Does Code 41 Mean?
Status code 41 on the Bryant 315AAV is a blower motor fault. The variable-speed ECM blower reports its speed and status to the Variable Speed Furnace Control; code 41 sets when the blower cannot reach 250 RPM or fails to communicate within the control's time limits, and Bryant notes it after thirty successive failing cycles.
Code 41 is the fault-level indicator that precedes the code 15 blower motor lockout. Code 41 is the control flagging repeated blower trouble while still attempting to run; once the failures accumulate into a locked-out state, it becomes code 15. Because this variable-speed blower serves both heating and cooling, a blower fault affects the whole system's air delivery.
Bryant directs checking the blower, the blower wiring, and the furnace control. In practice the most common cause is a failed ECM motor, followed by a mechanical problem — a loose blower wheel or one rubbing on its housing that keeps the motor from reaching speed — or a wiring/communication issue between the board and the motor. Diagnosing an ECM motor and its feedback requires meters and disassembly, so it is a technician repair.
What You'll Notice
- Airflow from the vents is weak or absent even though the furnace is trying to run
- You may hear the blower straining, rubbing, or failing to spin up
- The status LED flashes four short then one long flash
- The fault may progress to a code 15 blower motor lockout if it keeps failing
Common Causes
How This Is Diagnosed
A technician separates the three listed possibilities: they spin and inspect the blower wheel for a loose hub or rubbing against the housing that would prevent it reaching speed, check the wiring and connectors between the control and the ECM motor for communication faults, and evaluate the motor itself for proper power, programming, and operation. A wheel that is mechanically bound points to the blower assembly; intact hardware with lost feedback points to wiring or the motor.
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:
- Airflow is weak or absent and the blower will not come up to speed
- You hear rubbing, grinding, or a straining motor at the blower
- The fault repeats or escalates to a code 15 lockout
- Any ECM motor, blower wheel, or wiring diagnosis, which is not a homeowner repair
Frequently Asked Questions
How is code 41 different from code 15 on the Bryant 315AAV?
Code 41 is the blower motor fault flagged as failed cycles accumulate. Code 15 is the lockout that follows once those failures pile up and the control shuts the blower down for about 3 hours.
Could it be something other than a bad motor?
Yes. Bryant lists a loose or rubbing blower wheel and wiring problems along with a failed motor. A technician checks the wheel and wiring before condemning the ECM motor.
Why is my airflow weak with code 41?
The variable-speed blower cannot reach its target speed or communicate properly, so it moves little or no air. Because the same blower serves cooling, it can affect the air conditioner too.
Sources
✓ Verified against manufacturer service manual — March 2026