Carrier and Bryant gas furnaces share control boards. The board LED flashes a two-digit status code, such as 31 or 33, which you read through the small window in the blower door. Below are 21 Carrier and Bryant codes across 3 model series. Each one says what it means, which series it applies to, what you can safely check, and when to call a licensed pro, with a link to the Carrier and Bryant document it comes from.
The same code can mean different things on different series, so match the series column to your unit. Your unit's manual is the final word. Reviewed October 2026.
31 codes
| Code | Meaning | Applies to | Safety |
|---|---|---|---|
| LED off Status LED is continuously off | Status LED off (no power to control) | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | 🧭 Check first |
| LED on Status LED is continuously on | Status LED steady on (normal) | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | ✅ Keep running |
| Rapid flashing Status LED flashes rapidly | Rapid flashing LED (reversed polarity) | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | 🛑 Call a pro |
| 11 Status LED flashes: first digit is short flashes, second digit is long flashes | No previous fault code stored | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | ✅ Keep running |
| 12 Status LED flashes: first digit is short flashes, second digit is long flashes | Blower on after power up | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | ✅ Keep running |
| 13 Status LED flashes: first digit is short flashes, second digit is long flashes | Limit circuit lockout | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | 🧭 Check first |
| 13 Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 13.1 | Limit lockout (main limit circuit open) | Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace | 🧭 Check first |
| 14 Status LED flashes: first digit is short flashes, second digit is long flashes | Ignition lockout | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | 🧭 Check first |
| 14 Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 14.1 to 14.4 | Ignition lockout | Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace | 🧭 Check first |
| 21 Status LED flashes: first digit is short flashes, second digit is long flashes | Gas heating lockout | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | 🛑 Call a pro |
| 22 Status LED flashes: first digit is short flashes, second digit is long flashes | Abnormal flame-proving signal | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | 🛑 Call a pro |
| 23 Status LED flashes: first digit is short flashes, second digit is long flashes | Pressure switch did not open | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | 🛑 Call a pro |
| 24 Status LED flashes: first digit is short flashes, second digit is long flashes | Secondary voltage fuse is open | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | 🛑 Call a pro |
| 24 Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 24.1 | Fuse fault | Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace | 🛑 Call a pro |
| 31 Status LED flashes: first digit is short flashes, second digit is long flashes | Pressure switch did not close or reopened | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | 🛑 Call a pro |
| 31 Status LED flashes: first digit is short flashes, second digit is long flashes | High-heat pressure switch or relay did not close or reopened | Carrier 59TP6A two-stage variable speed ECM multipoise condensing gas furnace (Series 2, and Series 3 80-20, 100-20, 120-22) | 🛑 Call a pro |
| 31 Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 31.6 or 31.7 | High-stage pressure switch (HPS) fault | Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace | 🛑 Call a pro |
| 33 Status LED flashes: first digit is short flashes, second digit is long flashes | Limit circuit fault (limit or rollout switch open) | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | 🧭 Check first |
| 33 Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 33.1 or 33.2 | Main limit circuit switch open | Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace | 🧭 Check first |
| 34 Status LED flashes: first digit is short flashes, second digit is long flashes | Ignition proving failure | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | 🧭 Check first |
| 34 Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 34.1 and up | Ignition fault or flame lost | Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace | 🧭 Check first |
| 45 Status LED flashes: first digit is short flashes, second digit is long flashes | Control circuitry lockout | Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2) | 🛑 Call a pro |
| 45 Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 45.1 to 45.4 | Control board fault | Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace | 🛑 Call a pro |
| 25 Status LED flashes: first digit is short flashes, second digit is long flashes | Model selection or setup error | Carrier 59TP6A two-stage variable speed ECM multipoise condensing gas furnace (Series 2, and Series 3 80-20, 100-20, 120-22) | 🛑 Call a pro |
| 32 Status LED flashes: first digit is short flashes, second digit is long flashes | Low-heat pressure switch did not close or reopened | Carrier 59TP6A two-stage variable speed ECM multipoise condensing gas furnace (Series 2, and Series 3 80-20, 100-20, 120-22) | 🛑 Call a pro |
| 32 Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 32.2 | Open main pressure switch (LPS) | Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace | 🛑 Call a pro |
| 43 Status LED flashes: first digit is short flashes, second digit is long flashes | Low-heat pressure switch open while high-heat switch is closed | Carrier 59TP6A two-stage variable speed ECM multipoise condensing gas furnace (Series 2, and Series 3 80-20, 100-20, 120-22) | 🛑 Call a pro |
| 43 Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 43.1 | HPS closed before LPS | Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace | 🛑 Call a pro |
| 10 Rapid-flash status LED; display shows 10.1 | L1 polarity fault (rapid flash) | Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace | 🛑 Call a pro |
| 15 Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 15.1 | Lockout, no blower RPM detected | Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace | 🛑 Call a pro |
| 41 Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 41.1 or 41.2 | Blower RPM fault | Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace | 🛑 Call a pro |
✅ Usually fine to keep running · 🧭 Check a few things first · 🛑 Turn it off and call a licensed pro
The codes Carrier and Bryant documents for each series we have checked. If your series is not listed, the code may mean something different on your unit, so check its manual.
Applies to: Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2). Shows as: Status LED is continuously on
The status LED is steady on. The service label says the control has 24VAC power. This is normal when there is no fault.
When to call a pro: No action is needed unless the furnace is not heating. If it is not heating, check the thermostat and call a pro if it persists.
Applies to: Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2). Shows as: Status LED flashes: first digit is short flashes, second digit is long flashes
The blower runs for 90 seconds if the unit is powered up during a call for heat, or if the thermostat call for heat opens during the blower on-delay.
When to call a pro: No action is needed. This code is informational and the blower stops by itself after 90 seconds.
Applies to: Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2). Shows as: Status LED flashes: first digit is short flashes, second digit is long flashes
The pressure switch did not open when expected. The label says to check for obstructed pressure tubing or a pressure switch stuck closed.
When to call a pro: Call a licensed technician to inspect the pressure tubing and test the pressure switch.
Applies to: Carrier 59TP6A two-stage variable speed ECM multipoise condensing gas furnace (Series 2, and Series 3 80-20, 100-20, 120-22). Shows as: Status LED flashes: first digit is short flashes, second digit is long flashes
Either the model plug (PL4) is missing or incorrect, or setup switch SW1-1 or SW1-6 is positioned improperly. The control may default to the model stored in memory.
When to call a pro: Call a licensed technician. Setup switches, the model plug and the control programming are installer settings.
Applies to: Carrier 59TP6A two-stage variable speed ECM multipoise condensing gas furnace (Series 2, and Series 3 80-20, 100-20, 120-22). Shows as: Status LED flashes: first digit is short flashes, second digit is long flashes
The low-heat pressure switch is open while the high-heat pressure switch is closed. The label lists a plugged condensate drain, low inlet gas pressure, improper pressure switch wiring, water in the vent piping and a stuck open low-heat pressure switch.
When to call a pro: Call a licensed technician to test the pressure switches, tubing, venting and condensate drain.
Applies to: Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace. Shows as: Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 43.1
The high pressure switch (HPS) is closed before the low pressure switch (LPS).
When to call a pro: Call a licensed technician to test the pressure switches and check the venting.
Applies to: Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace. Shows as: Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 15.1
The control locked out because no blower RPM was detected.
When to call a pro: Call a licensed technician to check the blower motor and wiring.
Applies to: Bryant 926TC two-stage variable-speed ECM multipoise condensing gas furnace. Shows as: Status LED flashes: first digit is short flashes, second digit is long flashes; display shows 41.1 or 41.2
Minor 1 means no blower RPM at start up. Minor 2 means no RPM when the blower motor is running.
When to call a pro: Call a licensed technician to check the blower motor and wiring.
Shaun Cain · Certified HVAC & Refrigeration Technician · Ask an HVAC technician