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Carrier furnace status code · Sources read 2026-10-31

Carrier Furnace Code 15: Blower Motor Lockout

By the HVAC Responder Editorial Team

Quoted from Carrier troubleshooting guides, read 2026-10-31. Not reviewed by a licensed HVAC professional.

Code 15 is a blower motor lockout. Carrier's guides say the blower failed to reach 250 RPM, or failed to communicate, within 30 seconds of being turned on in two heating cycles in a row. The control auto-resets after 3 hours; code 41 covers the fault itself.

How code 15 looks on the furnace light

On these Carrier furnaces the status light shows code 15 as 1 short flash, then 5 long flashes . The guides explain the pattern:

EACH OF THE FOLLOWING STATUS CODES IS A TWO DIGIT NUMBER WITH THE FIRST DIGIT DETERMINED BY THE NUMBER OF SHORT FLASHES AND THE SECOND DIGIT BY THE NUMBER OF LONG FLASHES.

Codes differ between furnace generations, so match the series on your furnace’s rating plate to the guide below.

What Carrier’s guides say code 15 means, by furnace series

58CVA / 58CVX

Carrier form TG-GFC80-02, mid-efficiency variable-speed two-stage furnaces

15 BLOWER MOTOR LOCKOUT – Indicates the blower failed to reach 250 RPM or the blower failed to communicate within 30 seconds after being turned ON in two successive heating cycles. Control will auto reset after 3 hours. Refer to status code #41.

58MVP (Series 170 & 180), 58MVB, 58UVB

Carrier form 58-06T, variable-speed two-stage condensing furnaces

15 BLOWER MOTOR LOCKOUT – Indicates the blower failed to reach 250 RPM or the blower failed to communicate within 30 seconds after being turned ON in two successive heating cycles. Control will auto reset after 3 hours. Refer to status code #41.

59MN7A (Series 100)

Carrier form 59MN7A-01T, variable-speed modulating condensing furnaces

15 BLOWER MOTOR LOCKOUT – Indicates the blower failed to reach 250 RPM or the blower failed to communicate within 30 seconds after being turned ON in two successive heating cycles. Control will auto reset after 3 hours. Refer to status code #41.

Does code 15 reset on its own?

Carrier’s guides say the control will auto-reset after 3 hours.

What to do before you call

  • Write the code down before you touch anything. Carrier’s guides start with: “DO NOT REMOVE BLOWER ACCESS PANEL! Record status of AMBER LED.” Turning off power can also clear the code history.
  • Everything else on these lists (gas valve, pressure switches, wiring, venting, the control board) is technician work.

Get the furnace looked at

One call routes you to an independent local heating contractor. Tell them the code and the furnace series, and ask the diagnostic fee up front.

Call (877) 565-3062

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Related codes

All Carrier furnace codes

Furnace guides for the wider symptom

Sources

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