Bryant Furnace error codes
16 Bryant furnace codes and problems, each with ranked causes, safe homeowner checks and honest repair costs. Count the flashes or read the code on your control board, then find it below. Legends vary by board revision, so confirm against the label inside your unit's door. Carrier uses the same control boards — see Carrier furnace codes.
| Code | What it means | Severity |
|---|---|---|
| Code 12 | Bryant Furnace Code 12 means a blower call with no power. Causes, safe checks, and repair costs from $0 DIY to $600 for a control board. | Call a pro |
| Code 13 | Bryant furnace Code 13 means a limit circuit lockout. Learn causes, safe checks, technician diagnosis and repair costs from $0 DIY to $600. | Call a pro |
| Code 14 | Bryant Furnace Code 14 means an ignition lockout. Causes, safe checks, and repair costs ($0 DIY to $600 pro) explained for homeowners. | Call a pro |
| Code 21 | Bryant Code 21 means a gas valve wiring or relay fault on the control board. What it means, safe checks, and realistic 2026 US repair costs. | Call a pro |
| Code 22 | Bryant Furnace Code 22 means flame is sensed with the gas valve off. Causes, safe checks, and repair costs from $0 DIY to $600+ for a gas valve. | Call a pro |
| Code 23 | Bryant Code 23 means the pressure switch was stuck closed before the inducer ran. Causes, safe checks, technician fixes and $0–$350 repair costs. | Call a pro |
| Code 24 | Bryant Furnace Code 24 means the 3A control-board fuse is blown from a 24V wiring short. Causes, fixes and $75–$350 repair costs explained. | Call a pro |
| Code 31 | Bryant Furnace Code 31 means the pressure switch didn't prove. Causes, safe checks, fixes and real costs from $0 DIY to $1,200+ for inducer or vent work. | Call a pro |
| Code 32 | Bryant Furnace Code 32 means the low-stage pressure switch didn't close or reopened. Causes, safe checks, fixes and repair costs from $0 DIY to about $1,200. | Call a pro |
| Code 33 | Bryant furnace Code 33 means a limit or flame rollout switch tripped. Causes, safe checks, and pro repair costs from $0 to $600. | Call a pro |
| Code 34 | Bryant Furnace Code 34 means ignition proving failure. Causes: dirty flame sensor, igniter, gas, ground. Fixes and costs from $0 DIY to $400. | Call a pro |
| Code 41 | Bryant Furnace Code 41 means an ECM blower fault. Causes, safe checks, tech diagnosis, and repair costs from $0 DIY to $1,500 for a new blower motor. | Call a pro |
| Code 42 | Bryant Furnace Code 42 means an inducer motor fault. Learn causes, safe checks, fixes, and repair costs from $0 DIY to about $1,200 for a new inducer. | Call a pro |
| Code 43 | Bryant Furnace Code 43 means a pressure switch calibration fault. Causes, safe checks, fixes and repair costs from $0 DIY to about $1,200. | Call a pro |
| Code 44 | Bryant furnace Code 44 means a variable-speed blower calibration fault. Learn the causes, safe checks, technician fixes and repair costs ($0–$900). | Call a pro |
| Code 45 | Bryant Furnace Code 45 means a control circuitry lockout from flame-sense, software or gas-valve relay faults. Causes, fixes and $0–$1,200 costs. | Call a pro |
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