Furnace error codes (page 5)
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)
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. American Standard Furnace — 8 flashes American Standard Furnace 8 Flashes: Low Flame Sense American Standard furnace 8 flashes means a weak flame-sense signal from a dirty sensor. Causes, safe checks and repair costs from $0 DIY to $250. Lennox Furnace — Code E115 Lennox Furnace Code E115: Low 24 VAC Causes & Fixes Lennox Code E115 means low 24 VAC from an overloaded transformer or low-voltage wiring fault. Causes, safe checks, fixes and repair costs. Lennox Furnace — Code E113 Lennox Furnace Code E113: High Line Voltage Fixes & Costs Lennox Code E113 means high line voltage to the furnace. Causes, safe checks, technician diagnosis and repair costs for US homeowners. Lennox Furnace — Code E131 Lennox Furnace Code E131: Corrupted Control Parameters Lennox Code E131 means corrupted control parameters. Causes, safe checks, reconfiguration vs board replacement, and honest US repair costs. Lennox Furnace — Code E180 Lennox Furnace Code E180: Outdoor Sensor Fix & Cost Lennox Code E180 flags an outdoor air temp sensor fault (open, shorted, or out of range). Causes, safe checks, tech fixes and costs. Lennox Furnace — Code E204 Lennox Furnace Code E204: Gas Valve Wiring Fix & Cost Lennox Code E204 means a mis-wired gas valve. Learn the causes, safe checks, technician diagnosis, and honest US repair costs. Lennox Furnace — Code E205 Lennox Furnace Code E205: Gas Valve Relay Short Fix Lennox Furnace Code E205 means the gas valve relay is shorted or the valve is energized when it shouldn't be. Causes, fixes and repair costs. Lennox Furnace — Code E207 Lennox Furnace Code E207: Hot Surface Igniter Fix & Cost Lennox Code E207 means a hot surface igniter open circuit. See causes, safe checks, technician diagnosis and honest US repair costs. Lennox Furnace — Code E208 Lennox Furnace Code E208: Pressure Switch Open Fix Lennox E208 means the low pressure switch failed to close. Causes, safe checks, tech diagnosis and repair costs from $0 DIY to $1,200. Lennox Furnace — Code E210 Lennox Furnace Code E210: Pressure Switch Stuck Closed Fix Lennox Code E210 is listed as a low-pressure switch failed closed. Causes, safe checks, technician diagnosis and repair costs from $0 DIY to about $1,200. Lennox Furnace — Code E211 Lennox Furnace Code E211: High Pressure Switch Stuck Closed Lennox Code E211 is reported as high pressure switch failed closed. Verify the code number in your manual, then see causes, safe checks and repair costs. American Standard Furnace — 2 flashes American Standard Furnace 2 Flashes: Causes & Fixes American Standard furnace 2 flashes means an ignition-retry lockout that auto-resets in 1 hour. See causes, safe checks, and repair costs from $0 to $1,200. American Standard Furnace — 4 flashes American Standard Furnace 4 Flashes: Open Limit Circuit 4 flashes means an open high-limit or rollout switch from restricted airflow or overheating. Causes, safe checks, fixes and $0–$3,500 costs. American Standard Furnace — 6 flashes American Standard Furnace 6 Flashes: Reversed Polarity Fix American Standard furnace 6 flashes means reversed 115 VAC polarity or poor grounding. Causes, safe checks, and repair costs from $0 DIY to $350. American Standard Furnace — 5 flashes American Standard Furnace 5 Flashes: Flame With Gas Off American Standard furnace 5 flashes means flame sensed with the gas valve off. Causes, safe checks, and repair costs from $0 to $700+. American Standard Furnace — 3 flashes American Standard Furnace 3 Flashes: Causes & Fixes American Standard furnace 3 flashes means a pressure switch fault. Common causes, safe checks, technician diagnosis, and repair costs from $0 to about $1,200. American Standard Furnace — 7 flashes American Standard Furnace 7 Flashes: Gas Valve Circuit American Standard furnace 7 flashes means a gas valve circuit error. Causes, safe checks, and repair costs from $0 DIY to $1,200+ pro. American Standard Furnace — 9 flashes American Standard Furnace 9 Flashes: Igniter Circuit Fix American Standard furnace 9 flashes means an open igniter circuit or low current draw. Causes, safe checks, and repair costs ($0 DIY–$350). Lennox Furnace — Code E110 Lennox Furnace Code E110: Low Line Voltage Fixes & Costs Lennox Code E110 means low line voltage. Learn the causes, safe homeowner checks, technician diagnosis and repair costs from $0 DIY to $600+. Lennox Furnace — Code E111 Lennox Furnace Code E111: Reversed Polarity Fixes & Costs Lennox Code E111 means line voltage polarity is reversed. Causes, safe checks, technician fixes and honest US repair costs. Lennox Furnace — Code E112 Lennox Furnace Code E112: Ground Fault Causes & Fixes Lennox Furnace Code E112 means a ground fault or poor ground. Learn the causes, safe checks, technician diagnosis and repair costs. Trane Furnace — 2 flashes Trane Furnace 2 Flashes: System Lockout Causes & Fixes Trane furnace flashing 2 means a system lockout from failed ignition retries. Learn causes, safe checks, and repair costs ($0 DIY - $1,200). Trane Furnace — 8 flashes Trane Furnace 8 Flashes: Low Flame Sense Signal Fix Trane furnace 8 flashes means a low flame sense signal from a dirty flame sensor or weak flame. Causes, fixes and repair costs explained.