Furnace error codes
10 documented codes across brands, with ranked causes and repair costs.
Bryant Furnace — Code 33 Bryant Furnace Code 33: Meaning, Causes & Fixes Bryant furnace Code 33 means a limit or flame rollout switch tripped. Causes, safe checks, and pro repair costs from $0 to $600. Carrier Furnace — Code 13 Carrier Furnace Code 13: Meaning, Causes & Fixes Carrier furnace Code 13 means a limit circuit lockout. Causes: dirty filter, blocked vents, bad blower. Fixes cost $0 DIY to $600+. Bryant Furnace — Code 13 Bryant Furnace Code 13: Meaning, Causes & Fixes Bryant furnace Code 13 means a limit circuit lockout. Learn causes, safe checks, technician diagnosis and repair costs from $0 DIY to $600. Carrier Furnace — Code 31 (pressure switch) Carrier Furnace Code 31: Causes, Fixes & Costs Carrier furnace flashing code 31 (pressure switch/inducer fault)? What it means, causes ranked by likelihood, safe checks, and repair costs. Carrier Furnace — Code 33 Carrier Furnace Code 33: Causes, Fixes & Costs Carrier furnace flashing code 33 (limit circuit fault)? What it means, the causes ranked by likelihood, safe checks you can do, and repair costs. Goodman Furnace — Flame rollout / burning smell Goodman Furnace Flame Rollout: Shut Down Now Goodman furnace flame rollout switch tripped or a burning smell? Why this is an emergency, what to do right now, the CO risk, and repair costs. Carrier Furnace — Code 34 Carrier Furnace Code 34: Ignition Proving Failure & Fixes Carrier furnace Code 34 means ignition proving failure. Causes, safe checks and pro fixes — flame sensor, gas valve, $0 DIY to $600 repair. Goodman Furnace — Lockout (no heat) Goodman Furnace Lockout: Causes, Fixes & Costs Goodman or Amana furnace in ignition lockout with no heat? What it means, causes ranked, the dirty flame sensor fix, safe checks, and repair costs. Lennox Furnace — Code 200 (ignition lockout) Lennox Furnace Code 200: Causes, Fixes & Costs Lennox furnace showing code 200 ignition lockout with no heat? What it means, causes ranked, the flame-sensor fix, safe checks, and real repair costs. Trane Furnace — Code 90 (2 blinks) Trane Furnace Code 90 (2 Blinks): Causes & Costs Trane or American Standard furnace flashing code 90 / 2 blinks? What this inducer and pressure-switch fault family means, safe checks, and repair costs.