Carrier furnace code 15: Blower Motor Lockout
Professional repair
What does code 15 mean on a Carrier furnace? On the two-stage variable-speed control (58MVP, 58MVB, 58UVB), the blower failed to reach 250 RPM, or failed to talk to the control within 30 seconds of being switched on, in two heating cycles in a row. Official: the lockout auto-resets after 3 hours, and the root causes are the same as code 41.
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
Same diagnosis as code 41. The official flowchart is a voltmeter test sequence at the motor plugs, so this is a technician visit. DIY part cost: $400–800 — a pro visit for this class of fault typically runs $150–350.
What causes it (in order of likelihood)
- Everything under code 41 (rubbing or loose blower wheel, wiring from the control to the motor, blower control module or motor) TECH
Parts referenced by this code
Always match parts against your model's parts list — part numbers vary within a series.
Questions about this code
What does code 15 mean on a Carrier furnace?
On the two-stage variable-speed control (58MVP, 58MVB, 58UVB), the blower failed to reach 250 RPM, or failed to talk to the control within 30 seconds of being switched on, in two heating cycles in a row. Official: the lockout auto-resets after 3 hours, and the root causes are the same as code 41.
How do I fix Carrier furnace code 15?
Its causes match code 41. The official checks use a voltmeter at the motor plugs, so this is technician work.
How much does it cost to fix Carrier furnace code 15?
Cost depends on whether the cause is a rubbing wheel, wiring, the blower control module, or the motor. Ask the technician to check the wheel and wiring first.
Applies to
58MVP (Series 170/180) · 58MVB · 58UVB
Different Carrier generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Verified against Carrier 58MVP/58MVB/58UVB Troubleshooting Guide (58-06T), p.7/15 — “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.”
Verified against Carrier 58MVB Service and Maintenance Instructions (58MVB-2SM), p.17 — “Control will auto-reset after 3 hours. See code 41.”
Last verified 2026-09-05 · page updated 2026-10-03 · how we verify
Other Carrier furnace codes
These links include other Carrier model families. Code meanings can change by model and control board, so confirm your model and service manual before using a definition.