Furnace error codes (page 6)
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 — 9 flashes Trane Furnace 9 Flashes: Igniter Circuit Open Fixes Trane furnace 9 flashes means an open igniter circuit or no current draw. Causes, safe checks, and repair costs from $0 DIY to $250. Amana Furnace — 4 flashes Amana Furnace 4 Flashes: Open High-Limit Switch Fix Amana furnace 4 flashes means an open high-limit from overheating. Causes, safe checks, safety stop-rules, and repair costs from $0 DIY to $1,800. Amana Furnace — 5 flashes Amana Furnace 5 Flashes: Flame Sensed, No Call for Heat Amana furnace 5 flashes means flame detected with no heat call. Causes: leaking gas valve or flame sensor fault. Repairs run $150–$1,200. Amana Furnace — 7 flashes Amana Furnace 7 Flashes: Low Flame Signal Fix Amana furnace 7 flashes means a weak flame signal from a dirty sensor, poor ground, or misaligned burner. Causes, checks & $0–$1,200 repair costs. Amana Furnace — 8 flashes Amana Furnace 8 Flashes: Igniter Circuit Fault Fixes Amana furnace 8 flashes means an igniter relay or circuit fault. Causes, safe checks, and repair costs from $0 DIY to $700 if the control board is replaced. Amana Furnace — 9 flashes Amana Furnace 9 Flashes: High-Stage Pressure Switch Open Amana furnace 9 flashes means the high-stage pressure switch failed to close on high fire. Causes, safe checks, and repair costs of $0–$1,200. Bryant Furnace — Code 24 Bryant Furnace Code 24: Meaning, Causes & Fixes 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. Bryant Furnace — Code 32 Bryant Furnace Code 32: Low-Pressure Switch Fault Fixes 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. Bryant Furnace — Code 43 Bryant Furnace Code 43: Pressure Switch Calibration Fixes Bryant Furnace Code 43 means a pressure switch calibration fault. Causes, safe checks, fixes and repair costs from $0 DIY to about $1,200. Trane Furnace — 3 flashes Trane Furnace 3 Flashes: Pressure Switch Error Fixes Trane furnace 3 flashes means a pressure switch error. Learn causes like blocked vents, a bad inducer, and fixes plus repair costs. Trane Furnace — 4 flashes Trane Furnace 4 Flashes: Open Limit Circuit Causes & Fixes Trane furnace 4 flashes means an open temperature limit or rollout circuit. Causes, safe checks, fixes and repair costs for US homeowners. Trane Furnace — 5 flashes Trane Furnace 5 Flashes: Flame Sensed Without Gas Trane furnace 5 flashes means flame detected with the gas valve off. Causes, safe checks, technician diagnosis and repair costs from $0 to $600. Trane Furnace — 6 flashes Trane Furnace 6 Flashes: Reversed Polarity & Grounding Trane furnace 6 flashes means reversed 115 VAC polarity or poor grounding. Causes, safe homeowner checks, and real US repair costs for this pro-only fix. Trane Furnace — 7 flashes Trane Furnace 7 Flashes: Gas Valve Circuit Error Fixes Trane furnace 7 flashes means a gas valve circuit error. Learn the causes, safe checks, and repair costs — commonly $150–$1,200+ for a pro fix. Amana Furnace — 1 flashes Amana Furnace Code 1 Flashes: Ignition Lockout Fixes Amana furnace 1 flash means ignition failure lockout after 3 failed trials or 5 flame losses. Causes, fixes, and $0-$600 repair costs explained. Amana Furnace — 3 flashes Amana Furnace 3 Flashes: Pressure Switch Stuck Open Fix Amana furnace 3 flashes means the pressure switch stayed open. Causes: blocked flue, inducer, condensate. Fixes cost $0 DIY to $1,200. Amana Furnace — 2 flashes Amana Furnace 2 Flashes: Pressure Switch Stuck Closed Fix Amana furnace 2 flashes means the pressure switch is stuck closed. Causes, safe checks, technician diagnosis and repair costs from $0 to $350. Bryant Furnace — Code 41 Bryant Furnace Code 41: Blower Motor Fault Fixes 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. Bryant Furnace — Code 45 Bryant Furnace Code 45: Control Circuitry Lockout Fixes 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. Goodman Furnace — 3 flashes Goodman Furnace 3 Flashes: Pressure Switch Stuck Open Goodman furnace 3 flashes means pressure switch stuck open. Causes from blocked flue to condensate backup, plus fixes and repair costs. Goodman Furnace — 4 flashes Goodman Furnace 4 Flashes: Open High-Limit Switch Fix Goodman furnace 4 flashes means an open high-limit from overheating — dirty filter or airflow. Causes, fixes and $0–$1,200+ costs. Goodman Furnace — 5 flashes Goodman Furnace 5 Flashes: Flame With No Call for Heat Goodman 5 flashes means flame sensed with no heat call — a leaking gas valve or sensor/wiring fault. Causes, fixes and $150–$650 repair costs. Goodman Furnace — 7 flashes Goodman Furnace 7 Flashes: Low Flame Signal Fixes Goodman furnace 7 flashes means low flame signal from a dirty sensor, poor ground, or misaligned flame. Causes, fixes and repair costs explained. Goodman Furnace — 8 flashes Goodman Furnace 8 Flashes: Igniter Relay Problem Fix Goodman 8 flashes means an igniter relay or circuit fault. Causes, safe checks, technician diagnosis and repair costs from $0 DIY to $1,200.