Carrier and Bryant furnace status codes (5 furnace manuals compared)

By Jason Dearmin · Last reviewed November 14, 2026

Carrier, Bryant and Payne furnaces built on the same family of controls report faults through a status-code LED that you can see through the sight glass in the blower door. We compared the troubleshooting guides in five Carrier and Bryant furnace manuals, from an early-2000s 352MAV to a 2021 58SC0A, and the core codes have kept the same numbers and meanings for two decades. The differences are mostly in the two-stage boards, which add codes 15, 25, 32 and 43.

What this table coversStatus codes from five manufacturer documents: Carrier SP05-59 (352MAV Series B 2-stage condensing), 59SC5A-13SI (Comfort 59SC5A single-stage condensing), 59TP6A-10SI (Performance 59TP6A two-stage condensing), 58SC0A-05SI (Comfort 80 58SC0A/58SC1A single-stage) and Bryant II926TB-01 (926TB two-stage condensing). The Applies to column shows which of those five troubleshooting guides print each code. A code missing from a model's list was not in that guide; it does not prove the code can never appear. Infinity and Evolution communicating systems also report faults as text on the wall control, which this table does not cover. The service label on your blower door is the final authority.

How to read the display

Each status code is a two-digit number. The first digit is the number of short flashes and the second digit is the number of long flashes, so code 33 is three short flashes followed by three long flashes. The 59TP6A and 926TB manuals describe the same rule for their amber LED.

A steady LED means something different from a code. In SP05-59, continuous off means check for 115 VAC at the control and 24 VAC at the transformer, continuous on means the control has 24 VAC power, and rapid flashing means line voltage polarity is reversed. The newer troubleshooting flow charts ask the same three questions (is the LED on, blinking rapidly, or blinking short and long) before you read a code.

Recalling stored codes: on the two-stage 59TP6A and 926TB, technicians disconnect the R thermostat wire, reset power and turn setup switch SW1-1 on; the LED then flashes stored codes in order until code 11. On the 80% 58SC0A red-LED board, the guide says not to remove power or the blower door before recalling the code, and to briefly remove and reconnect one red wire from the draft safeguard switch, or short TEST/TWIN to Com24V. Write the code down before you open the furnace or switch the power off.

Carrier / Bryant code table

Code	Meaning	Applies to	What the document says
11	No previous code	352MAV · 59SC5A · 59TP6A · 58SC0A · Bryant 926TB	Stored codes are erased after 72 hours. On two-stage 59TP6A and 926TB boards they can also be erased manually with setup switch SW1-1; on red-LED boards (SP05-59, 58SC0A) they are erased whenever 115 V or 24 V power is interrupted.
12	Blower on after power up (115 V or 24 V)	352MAV · 59SC5A · 59TP6A · 58SC0A · Bryant 926TB	Normal operation. The 59SC5A, 59TP6A and 58SC0A guides say the blower runs for 90 seconds if the unit is powered up during a call for heat or if the call ends during the blower on-delay.
13	Limit circuit lockout	352MAV · 59SC5A · 59TP6A · 58SC0A · Bryant 926TB	A limit or flame rollout switch was open longer than 3 minutes. Two-stage boards (59TP6A, 926TB) also lock out after 10 successive limit trips in high heat. On the 80% 58SC0A the circuit also includes the draft safeguard switch and, if used, a blocked vent shutoff switch. Auto-resets after 3 hours. Full explanation
14	Ignition lockout	352MAV · 59SC5A · 59TP6A · 58SC0A · Bryant 926TB	The furnace failed to ignite gas and prove flame in 4 attempts. Auto-resets after 3 hours. See code 34. Full explanation
15	Blower motor lockout	59TP6A · Bryant 926TB	The blower failed to reach 250 RPM, or failed to communicate within 30 seconds of being turned on, in two successive heating cycles. Auto-resets after 3 hours.
21	Gas heating lockout	352MAV · 59SC5A · 59TP6A · 58SC0A · Bryant 926TB	Turn off power and wait 5 minutes to retry. The guides list a stuck-closed gas valve relay on the control, or a miswire or short to the gas valve wire.
22	Abnormal flame-proving signal	352MAV · 59SC5A · 59TP6A · 58SC0A · Bryant 926TB	Flame is proved while the gas valve is de-energized. The inducer runs until the fault clears. Check for a stuck-open or leaky gas valve.
23	Pressure switch did not open	352MAV · 59SC5A · 59TP6A · 58SC0A · Bryant 926TB	Check for an obstructed pressure tube or a pressure switch stuck closed.
24	Secondary voltage fuse is open	352MAV · 59SC5A · 59TP6A · 58SC0A · Bryant 926TB	Short circuit in the 24 V wiring, including thermostat leads. Technicians disconnect thermostat leads to isolate it.
25	Invalid model selection or setup error	59TP6A · Bryant 926TB	Four flashes at power-up mean the model plug PL4 is missing and the control is using the stored model. Continuous flashing can mean a missing plug with no stored model, a thermostat call with SW1-1 or SW1-6 on, twinned furnaces of different models, or the wrong replacement control.
31	Pressure switch did not close or reopened. Two-stage boards: high-heat pressure switch or relay. 59SC5A: LPS or HPS pressure switch	352MAV · 59SC5A · 59TP6A · 58SC0A · Bryant 926TB	Single-stage guides list vent sizing, restricted vent, excessive wind, low inducer voltage, low inlet gas pressure, obstructed or disconnected pressure tubing, a defective inducer or switch, and on condensing models a plugged condensate drain or water in the vent pipe. Two-stage boards refer to code 32.
32	Low-heat pressure switch did not close or reopened	352MAV · 59TP6A · Bryant 926TB	If open longer than 5 minutes, the inducer shuts off for 15 minutes before a retry. Check list: vent sizing, restricted vent, excessive wind, low inlet gas pressure, obstructed or disconnected pressure tubing, miswired or defective switches, plugged condensate drain, water in the vent pipe, defective inducer, low inducer voltage. Full explanation
33	Limit circuit fault	352MAV · 59SC5A · 59TP6A · 58SC0A · Bryant 926TB	A limit or flame rollout switch is open (58SC0A adds the draft safeguard and blocked vent switch). On two-stage boards it can also mean high-heat-only operation after 2 successive low-heat limit trips. Blower runs at least 4 minutes; open longer than 3 minutes becomes lockout 13. Flame rollout switch requires a manual reset. Full explanation
34	Ignition proving failure	352MAV · 59SC5A · 59TP6A · 58SC0A · Bryant 926TB	Flame was not sensed during trial for ignition; the control repeats ignition 3 more times before lockout 14. Includes the flame-sensor current check (nominal 4.0 to 6.0 microamps). Full explanation
43	Low-heat pressure switch open while high-heat pressure switch is closed	352MAV · 59TP6A · Bryant 926TB	Check for a low-heat switch stuck open, disconnected or obstructed pressure tube, miswired switches, low inlet gas pressure, plugged condensate drain or water in the vent pipe.
45	Control circuitry lockout	352MAV · 59SC5A · 59TP6A · 58SC0A · Bryant 926TB	Auto-resets after a 1-hour lockout caused by a flame circuit failure, a gas valve relay stuck open or a software check error. Reset power to clear. Replace the control if the code repeats.

Sources: SP05-59 status code table; 59SC5A-13SI troubleshooting guide p. 83; 59TP6A-10SI Fig. 72 pp. 89-90; 58SC0A-05SI Fig. 51 pp. 36-37; Bryant II926TB-01 troubleshooting guide pp. 88-89. 352MAV = SP05-59. Codes 41 and 42 are referred to in some two-stage guides but are not printed in the pages we read, so they are left out.

Which document matches my furnace?

Column label	Document	Furnace type
352MAV	Carrier SP05-59 Service and Maintenance Procedures	Deluxe 4-way multipoise 2-stage direct-vent condensing (352MAV Series B)
59SC5A	Carrier 59SC5A-13SI	Comfort single-stage 4-way multipoise condensing, Series 1 and 2
59TP6A	Carrier 59TP6A-10SI (11/18)	Performance two-stage variable-speed ECM condensing
58SC0A	Carrier 58SC0A-05SI (09/21)	Comfort 80 single-stage multi-speed ECM, 80% AFUE (58SC0A and low-NOx 58SC1A)
Bryant 926TB	Bryant II926TB-01 (04/19)	Two-stage variable-speed ECM multipoise condensing

The model number is on the rating plate inside the furnace. The first five characters (for example 59SC5 or 926TB) identify the family. Bryant and Payne furnaces are built by the same company as Carrier, and the Bryant 926TB guide uses the same code numbers as the Carrier two-stage guide; still check the label on your own blower door.

Most common winter codes Code 33 (limit circuit) and 13 (its lockout) usually point at airflow or venting, so start with the filter and the outdoor vent terminations. Codes 31 and 32 are the pressure-switch family; see our furnace pressure switch guide. Code 34 and its lockout 14 are ignition and flame-sensing problems.

Detailed explanations

SafetyThese tables describe what the manufacturer documents say. Gas, combustion, refrigerant and line-voltage repairs are for licensed professionals. If you smell gas, leave the building and call your gas utility or 911. Safety disclaimer.

Sources

SP05-59 Service and Maintenance Procedures: Deluxe 4-Way Multipoise 2-Stage Direct-Vent Condensing Gas Furnace (Carrier (shareddocs.com)) Covers: Carrier 2-stage condensing gas furnaces with the status-code LED control described in the document. Other Carrier, Bryant and Payne boards can use different codes; check the service label on your furnace.
Installation, Start-up, Operating and Service and Maintenance Instructions 59SC5A-13SI: 59SC5A Single Stage 4-Way Multipoise Condensing Gas Furnace, Series 1 and 2 (Troubleshooting Guide) (Carrier (shareddocs.com)) Covers: Carrier Comfort 59SC5A single-stage condensing furnaces, Series 1 and 2.
Installation, Start-up, Operating and Service and Maintenance Instructions 59TP6A-10SI (11/18): 59TP6A Two-Stage Variable Speed ECM Multipoise Condensing Gas Furnace (Fig. 72 Troubleshooting Guide) (Carrier (shareddocs.com)) Covers: Carrier Performance 59TP6A two-stage variable-speed condensing furnaces with the amber-LED control.
Installation, Start-Up, Operating and Service and Maintenance Instructions 58SC0A-05SI (09/21): 58SC0A/58SC1A 80% AFUE Single-Stage Multi-Speed ECM Furnace (Fig. 51 Troubleshooting Guide) (Carrier (shareddocs.com)) Covers: Carrier Comfort 80 58SC0A and 58SC1A (low NOx) non-condensing single-stage furnaces.
Installation, Start-up, Operating and Service and Maintenance Instructions II926TB-01 (04/19): 926TB Two-Stage Variable-Speed ECM Multipoise Condensing Gas Furnace (Troubleshooting Guide) (Bryant Heating & Cooling Systems (Carrier family; shareddocs.com)) Covers: Bryant 926TB two-stage variable-speed condensing furnaces.