Goodman Furnace error codes
24 Goodman furnace codes and problems, each with ranked causes, safe homeowner checks and honest repair costs. Count the flashes or read the code on your control board, then find it below. Legends vary by board revision, so confirm against the label inside your unit's door. Amana uses the same control boards — see Amana furnace codes.
Of these, 1 is an emergency (shut the unit off and call a licensed tech), 22 need a professional repair and 1 is usually safe to check yourself.
| Code | What it means | Severity |
|---|---|---|
| 1 flashes | Goodman furnace 1 flash means ignition failure lockout after 3 failed trials. Causes, safe checks, and repair costs from $0 DIY to $600+. | Call a pro |
| 2 flashes | Goodman 2-flash code means the pressure switch is stuck closed. Causes, safe checks, tech diagnosis and repair costs from $0 DIY to $350. | Call a pro |
| 3 flashes | Goodman furnace 3 flashes means pressure switch stuck open. Causes from blocked flue to condensate backup, plus fixes and repair costs. | Call a pro |
| 4 flashes | Goodman furnace 4 flashes means an open high-limit from overheating — dirty filter or airflow. Causes, fixes and $0–$1,200+ costs. | Call a pro |
| 5 flashes | 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. | Call a pro |
| 7 flashes | Goodman furnace 7 flashes means low flame signal from a dirty sensor, poor ground, or misaligned flame. Causes, fixes and repair costs explained. | Call a pro |
| 8 flashes | Goodman 8 flashes means an igniter relay or circuit fault. Causes, safe checks, technician diagnosis and repair costs from $0 DIY to $1,200. | Call a pro |
| 9 flashes | Goodman 9 flashes means the high-stage pressure switch didn't close on high fire. Causes, safe checks, technician fixes and honest US costs. | Call a pro |
| Blower not running | Goodman furnace blower not running? Causes from a bad blower motor, capacitor, or control board, plus DIY checks, repairs and honest cost ranges. | Call a pro |
| Blower won't shut off | Goodman furnace blower running nonstop? Common causes are thermostat fan settings, limit switch, or bad control board — with DIY checks and repair costs. | DIY-friendly |
| Blowing cold air | Goodman furnace blowing cold air? Causes include thermostat fan settings, failed ignition, flame-sensor faults & limit trips. Fixes and $0–$1,200 costs. | Call a pro |
| Clicking but not starting | 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. | Call a pro |
| Flame rollout / burning smell | 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. | Emergency |
| Flame sensor problems | Goodman furnace flame sensor problems cause weak flame signal and short cycling. Causes, cleaning, and repair costs from $0 to $1,200. | Call a pro |
| Ignition lockout | Goodman furnace ignition lockout means repeated failed ignition. Causes, safe checks, technician fixes and honest repair costs ($0 DIY–$1,200). | Call a pro |
| Keeps shutting off | 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. | Call a pro |
| Leaking water | Goodman furnace leaking water? Causes include clogged condensate lines, cracked traps, and inducer issues. Fixes and costs from $0 DIY to $1,800+. | Call a pro |
| Lockout (no heat) | 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. | Call a pro |
| Loud bang on startup | 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. | Call a pro |
| Pressure switch stuck open | Goodman furnace pressure switch stuck open? Causes include blocked vent, bad inducer, condensate clogs. Fixes and costs from $0 DIY to $1,200. | Call a pro |
| Runs constantly but not enough heat | Goodman furnace running nonstop but can't warm the house? Causes from dirty filters to failing heat exchangers, plus DIY checks and repair costs. | Call a pro |
| Short cycling | Goodman furnace short cycling causes: dirty filter, overheating limit, flame sensor, oversizing. DIY checks plus repair costs from $0 to $1,800+. | Call a pro |
| Won't ignite | 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+. | Call a pro |
| Won't turn on | 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. | Call a pro |
Don't see your code? Look it up — every search we can't answer goes into the queue for the next guide.