Furnace error codes (page 3)
178 documented codes across brands, with ranked causes and repair costs.
Rheem furnace code chart (13) York furnace code chart (21) Goodman furnace code chart (24) Lennox furnace code chart (34) Trane furnace code chart (23) Carrier furnace code chart (30) Amana furnace code chart (9) American Standard furnace code chart (8) Bryant furnace code chart (16)
Trane Furnace — Ignition lockout Trane Furnace Ignition Lockout: Causes, Fixes & Cost Trane furnace ignition lockout means failed ignition after repeated tries. Causes, safe checks, fixes and costs from $0 DIY to $700 pro. Trane Furnace — Keeps shutting off Trane Furnace Keeps Shutting Off: Causes & Fixes Why your Trane furnace keeps shutting off — overheating limits, flame loss, pressure switches and dirty flame sensors — plus fixes and costs from $0 to $3,500+. Trane Furnace — Loud bang on startup Trane Furnace Loud Bang on Startup: Causes & Fixes Trane furnace makes a loud bang on startup from delayed ignition or duct flexing. Causes, safe checks, CO safety and repair costs ($0 DIY–$3,500+). Trane Furnace — Short cycling Trane Furnace Short Cycling: Causes, Fixes & Costs Trane furnace short cycling? Causes include a dirty filter, overheating limit trips, flame-sensor and control-board faults, plus fixes and US repair costs. Trane Furnace — Won't ignite Trane Furnace Won't Ignite: Causes, Fixes & Costs Trane furnace won't ignite? Common causes include a bad igniter, dirty flame sensor, or ignition lockout, plus DIY checks and repair costs. Trane Furnace — Won't turn on Trane Furnace Won't Turn On: Causes, Fixes & Costs Trane furnace won't turn on? Causes from tripped breakers to failed transformers, blower door switches & control boards, plus fixes and honest US costs. Carrier Furnace — Pressure switch stuck open Carrier Furnace Pressure Switch Stuck Open: Causes & Fixes Carrier furnace pressure switch stuck open: blocked vent, weak inducer or condensate clog causes plus fixes and repair costs ($0 DIY–$1,200). Carrier Furnace — Runs constantly but not enough heat Carrier Furnace Runs Constantly But Not Enough Heat Carrier furnace runs nonstop but the house stays cold. Causes from dirty filters to failing heat exchangers, plus DIY checks, fixes and repair costs. Carrier Furnace — Won't ignite Carrier Furnace Won't Ignite: Causes, Fixes & Costs Carrier furnace won't ignite? Common causes include a dirty flame sensor, bad igniter, gas or pressure switch faults, plus DIY checks and repair costs. Carrier Furnace — Won't turn on Carrier Furnace Won't Turn On: Causes, Fixes & Costs Carrier furnace won't turn on? Common causes include a tripped breaker, dead thermostat batteries, blown fuse or bad door switch. Fixes and costs inside. Goodman Furnace — Blower won't shut off Goodman Furnace Blower Won't Shut Off: Causes & Fixes Goodman furnace blower running nonstop? Common causes are thermostat fan settings, limit switch, or bad control board — with DIY checks and repair costs. Goodman Furnace — Blowing cold air Goodman Furnace Blowing Cold Air: Causes & Fixes Goodman furnace blowing cold air? Causes include thermostat fan settings, failed ignition, flame-sensor faults & limit trips. Fixes and $0–$1,200 costs. Goodman Furnace — Clicking but not starting Goodman Furnace Clicking But Not Starting: Fixes Goodman furnace clicks but won't start? Causes include a stuck pressure switch, failing inducer, weak igniter, or control board fault. Fixes and costs inside. Goodman Furnace — Ignition lockout Goodman Furnace Ignition Lockout: Causes, Fixes & Costs Goodman furnace ignition lockout means repeated failed ignition. Causes, safe checks, technician fixes and honest repair costs ($0 DIY–$1,200). Goodman Furnace — Keeps shutting off Goodman Furnace Keeps Shutting Off: Causes & Fixes Goodman furnace keeps shutting off? Common causes are dirty filters, flame sensor, limit and pressure switches. Fixes and costs from $0 DIY to $1,200. Goodman Furnace — Leaking water Goodman Furnace Leaking Water: Causes, Fixes & Costs Goodman furnace leaking water? Causes include clogged condensate lines, cracked traps, and inducer issues. Fixes and costs from $0 DIY to $1,800+. Goodman Furnace — Loud bang on startup Goodman Furnace Loud Bang on Startup: Causes & Fixes A loud bang when your Goodman furnace ignites usually means delayed ignition or ductwork oil-canning. Causes, safe checks, fixes and $0–$3,000+ costs. Goodman Furnace — Won't ignite Goodman Furnace Won't Ignite: Causes, Fixes & Costs Goodman furnace won't ignite? Common causes include a bad igniter, weak flame sensor, or no gas. See fixes and repair costs from $0 DIY to $1,200+. Carrier Furnace — Blower not running Carrier Furnace Blower Not Running: Causes & Fixes Carrier furnace blower not running? Causes from bad capacitors to door switches, plus fixes and repair costs from $0 DIY to $1,200. Carrier Furnace — Blower won't shut off Carrier Furnace Blower Won't Shut Off: Causes & Fixes Carrier furnace blower running non-stop? Causes include fan setting, bad limit switch, or a stuck fan relay, plus DIY checks and repair costs. Carrier Furnace — Blowing cold air Carrier Furnace Blowing Cold Air: Causes & Fixes Carrier furnace blowing cold air? Common causes are thermostat fan settings, ignition faults, overheating and flame-sensor issues, plus fixes and costs. Carrier Furnace — Clicking but not starting Carrier Furnace Clicking But Not Starting: Causes & Fixes Carrier furnace clicking but not starting? Causes include a cracked igniter, dirty flame sensor, or weak inducer draft. Fixes and costs from $0 to $1,200. Carrier Furnace — Flame sensor problems Carrier Furnace Flame Sensor Problems: Causes & Fixes Carrier furnace flame sensor problems cause short cycling and no heat. Learn the causes, safe checks and repair costs ($0 DIY reset to $1,200 pro). Carrier Furnace — Ignition lockout Carrier Furnace Ignition Lockout: Causes, Fixes & Costs Carrier furnace ignition lockout means failed ignition after repeated tries. See causes, safe checks, fixes and repair costs from $0 DIY to $1,200.