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- Code 15.1
Carrier gas furnace code 15.1: Blower lockout, no blower speed signal
Gas furnace, Canada and United States
The control locked out because it detected no blower speed. The causes are the same as for code 41.1.
This needs a licensed gas technician. There is nothing safe to check yourself. Leave the covers on and book a professional.
Only some models show this code. Check the list below.
What causes it
-
Loose blower wire connections.
-
A failed blower motor.
How to read this code on your unit
The three-digit display sits on the furnace control behind the blower door. Through the sight glass in the door you see only the status light, which flashes the first two digits of the code. Count the short flashes for the first digit, then the long flashes for the second, so 3 short flashes followed by 3 long flashes is a 33.x code. Write down what you see before you open the door or switch the furnace off. The full code with its third digit shows on the control display only with the door removed and the door switch closed, which is a job for a technician. A technician can also look back at the last 7 faults in the FLt menu. Stored codes are erased by themselves after 72 hours of powered operation after the last fault, and the display shows non when no fault is stored.
Booking a licensed gas technician
Book a licensed gas technicianlicensed gas technician
- Turn the unit off and leave the covers on. Gas components must only be serviced by a licensed technician.
- Note the code, how often it appears, and the model and serial numbers from the rating label.
- Book a licensed gas technician and give them those details.
Models that show this code
83 models in 10 ranges
| Range | Models |
|---|---|
| 58SP0B/58SP1B | 58SP0B045V14-12, 58SP0B070V14-12, 58SP0B070V17-16, 58SP0B090V17-16, 58SP0B090V21-20, 58SP0B110V21-22, 58SP0B135V24-22, 58SP1B045V14-12, 58SP1B070V14-12, 58SP1B070V17-16, 58SP1B090V17-16, 58SP1B090V21-20, 58SP1B110V21-22, 58SP1B135V24-22 |
| 58TN0B/58TN1B | 58TN0B045C17-12, 58TN0B070C14-12, 58TN0B070C17-16, 58TN0B070C21-20, 58TN0B090C17-16, 58TN0B090C21-20, 58TN0B110C21-20, 58TN0B135C24-22, 58TN1B045C17-12, 58TN1B070C14-12, 58TN1B070C17-16, 58TN1B070C21-20, 58TN1B090C17-16, 58TN1B090C21-20, 58TN1B110C21-20, 58TN1B135C24-22 |
| 58TP0B/58TP1B | 58TP0B045V14-12, 58TP0B070V14-12, 58TP0B070V17-16, 58TP0B090V17-16, 58TP0B090V21-20, 58TP0B110V21-22, 58TP0B135V24-22, 58TP1B045V14-12, 58TP1B070V14-12, 58TP1B070V17-16, 58TP1B090V17-16, 58TP1B090V21-20, 58TP1B110V21-22, 58TP1B135V24-22 |
| 59TN6C | 59TN6C040C14-10, 59TN6C060C17-14, 59TN6C080C17-14, 59TN6C080C21-20, 59TN6C100C21-22, 59TN6C120C24-22 |
| 59TN7A | 59TN7A060C17-16, 59TN7A080C17-16, 59TN7A080C21-20, 59TN7A100C21-22, 59TN7A120C24-22 |
| 59TP6C | 59TP6C040V14-10, 59TP6C040V17-12, 59TP6C060V14-12, 59TP6C060V17-16, 59TP6C080V17-16, 59TP6C080V21-20, 59TP6C100V21-20, 59TP6C100V21-22, 59TP6C120V24-22 |
| 59TP7A | 59TP7A060V17-16, 59TP7A080V17-16, 59TP7A080V21-20, 59TP7A100V21-20, 59TP7A100V21-22, 59TP7A120V24-22 |
| 58CU0B | 58CU0B040C17-12, 58CU0B060C17-16, 58CU0B080C21-20, 58CU0B100C21-20 |
| 59CU5B | 59CU5B060C17-16, 59CU5B080C21-20, 59CU5B100C21-22 |
| 59MN7C | 59MN7C060C17-14, 59MN7C060C21-20, 59MN7C080C17-14, 59MN7C080C21-20, 59MN7C100C21-22, 59MN7C120C24-22 |
Where this comes from
- 58SP0B gas furnace, installation, start-up, operating and service instructions (58SP0B-01SI) , page 30
- 59TP6C gas furnace, installation, start-up, operating and service instructions (59TP6C-03SI) , page 56, 76
- 59TN6C gas furnace, installation, start-up, operating and service instructions (59TN6C-04SI) , page 57, 76
- 58CU0B gas furnace, installation, start-up, operating and service instructions (58CU0B-03SI) , page 28, 43
- 59CU5B gas furnace, installation, start-up, operating and service instructions (59CU5B-05SI) , page 49, 66
- 59MN7C gas furnace, installation, start-up, operating and service instructions (59MN7C-04SI) , page 53, 74
Checked against the manufacturer's manual on 11 October 2026.
Other Carrier gas furnace codes
| Code | Meaning | What you can do |
|---|---|---|
| 15 | Blower motor lockout | Call a pro |
| 41 | Blower motor fault, speed or communication lost | Call a pro |
| 14.1 | Ignition lockout after repeated failed lighting attempts | Safe checks first, then a pro |
| 14.2 | Flame lost 3 times after 70 seconds of heating | Safe checks first, then a pro |
| 14.3 | Lockout after 7 flame losses in one heat request | Safe checks first, then a pro |
| 14.4 | Lockout after repeated pressure switch openings | Safe checks first, then a pro |
| 15.2 | Blower lockout, blower never reached 500 rpm | Call a pro |
| 17.1 | Lost communication with the Bluetooth module | Call a pro |
| 19.1 | Lost InteliSense communication with the thermostat | Call a pro |
| 41.1 | No blower speed at start-up | Call a pro |
| 41.2 | Blower speed lost while running | Call a pro |
| 41.3 | Blower not reaching 500 rpm | Call a pro |
See all fan or blower fault codes on gas furnaces across brands.