Furnace error codes (page 4)
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)
Carrier Furnace — Leaking water Carrier Furnace Leaking Water: Causes, Fixes & Costs Carrier furnace leaking water? Causes include clogged condensate lines, bad drains, and flue issues, plus fixes and repair costs from $0 to $3,000+. Carrier Furnace — Loud bang on startup Carrier Furnace Loud Bang on Startup: Causes & Fixes Carrier furnace loud bang on startup usually means delayed ignition or duct oil-canning. Learn causes, safe checks, fixes and repair costs. Carrier Furnace — Short cycling Carrier Furnace Short Cycling: Causes, Fixes & Costs Carrier furnace short cycling? Learn the top causes—dirty filter, overheating, flame sensor, oversizing—plus safe checks, fixes and repair costs. Lennox Furnace — Code E209 Lennox Furnace Code E209: High Fire Pressure Switch Fix Lennox Code E209 means the high-fire pressure switch failed to close. Causes, safe checks, tech diagnosis and repair costs from $0 DIY to $1,200 or more. Lennox Furnace — Code E240 Lennox Furnace Code E240: Low Flame Current Fix & Cost Lennox Code E240 means low flame current in run mode from a dirty flame sensor or weak flame. Causes, fixes and honest US costs inside. Rheem Furnace — Won't ignite Rheem Furnace Won't Ignite: Causes, Fixes & Costs Rheem furnace won't ignite? Common causes include a failed hot surface igniter, dirty flame sensor, or ignition lockout — fixes cost $0–$1,200. Amana Furnace — Ignition lockout Amana Furnace Ignition Lockout: Causes, Fixes & Costs Amana furnace ignition lockout means failed ignition after retries. Causes, DIY resets and technician fixes, costs $0 DIY to $600 pro. Carrier Furnace — Keeps shutting off Carrier Furnace Keeps Shutting Off: Causes, Fixes & Costs Carrier furnace keeps shutting off? Causes include dirty filters, flame sensor, limit switch and pressure switch faults, plus fixes and US repair costs. Goodman Furnace — Short cycling Goodman Furnace Short Cycling: Causes, Fixes & Costs Goodman furnace short cycling causes: dirty filter, overheating limit, flame sensor, oversizing. DIY checks plus repair costs from $0 to $1,800+. Goodman Furnace — Won't turn on Goodman Furnace Won't Turn On: Causes, Fixes & Costs Goodman furnace won't turn on? Causes from blown fuses to failed boards, safe DIY checks, tech diagnosis and repair costs from $0 to $1,800. Lennox Furnace — Code E250 Lennox Furnace Code E250: Limit Switch Open Fix & Cost Lennox Code E250 means the primary limit circuit is open from restricted airflow or overheating. Causes, safe checks, fixes and US repair costs. Lennox Furnace — Code E270 Lennox Furnace Code E270: Ignition Retry Lockout Fix Lennox furnace Code E270 means max ignition retries exceeded. Learn causes, safe checks, technician diagnosis and repair costs from $0 to $1,200. Trane Furnace — Blowing cold air Trane Furnace Blowing Cold Air: Causes, Fixes & Costs Trane furnace blowing cold air? Causes from thermostat fan settings to failed ignition, flame sensor & control board, plus fixes and honest US costs. York Furnace — 10 flashes York Furnace 10 Flashes: Gas Valve Circuit Error Fixes York furnace 10 flashes means the gas valve is energized with no call for heat. Gas-safety steps, causes, safe checks, and repair costs. York Furnace — Won't ignite York Furnace Won't Ignite: Causes, Diagnosis & Fixes Why a York furnace won't ignite: bad igniter, flame sensor, gas or pressure issues, plus safe checks, tech diagnosis and repair costs ($0–$1,200+). Lennox Furnace — Code E125 Lennox Furnace Code E125: Control Self-Check Failure Fix Lennox furnace Code E125 means the control board failed its internal self-check. Learn causes, safe checks and board replacement costs. Lennox Furnace — Code E206 Lennox Furnace Code E206: Gas Valve Relay Fix & Cost Lennox Code E206 means a second-stage gas valve relay failure. Learn causes, safe checks, technician fixes and honest US repair costs. Lennox Furnace — Code E241 Lennox Furnace Code E241: Flame Sensed Out of Sequence Fix Lennox furnace Code E241 means flame is still present after the gas valve closes. Causes, safe checks, technician fixes and honest US repair costs. York Furnace — 2 flashes York Furnace 2 Flashes: Pressure Switch Stuck Closed York furnace 2 flashes means the pressure switch is closed with the inducer off. Causes, safe checks, and $0–$400 repair costs. York Furnace — 3 flashes York Furnace 3 Flashes: Pressure Switch Open Causes & Fixes York furnace 3 flashes means pressure switch open with inducer on. Causes: blocked vent, clogged condensate, bad switch. Fixes $0–$1,200. York Furnace — 4 flashes York Furnace 4 Flashes: Open Limit Switch Causes & Fixes York furnace 4 flashes means an open high-limit switch from restricted airflow or overheating. Causes, safe checks, fixes and $10–$1,500+ costs. York Furnace — 5 flashes York Furnace 5 Flashes: Flame Sensed With Gas Off York furnace 5 flashes means flame sensed with the gas valve off. Causes, safe checks, tech diagnosis and repair costs from $0 DIY to $1,200. York Furnace — 6 flashes York Furnace 6 Flashes: Pressure Switch Cycle Lockout York furnace 6 flashes means pressure switch cycle lockout. Causes, safe checks, fixes and repair costs from $0 DIY to $1,200. York Furnace — 9 flashes York Furnace 9 Flashes: Reversed 115 VAC Polarity Fix York furnace 9 flashes means reversed 115 VAC polarity. Causes, safe checks, and repair costs from $0 DIY to about $250 for an electrician.