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- Flue or venting fault: gas furnace codes by brand
Flue or venting fault: gas furnace codes by brand
Combustion air intake or exhaust is blocked, restricted or not proven.
| Brand | Code | Meaning | What you can do |
|---|---|---|---|
| Carrier | 23 | Flue or venting fault (depends on model) | Call a pro |
| Carrier | 31 | Flue or venting fault (depends on model) | Safe checks first, then a pro |
| Carrier | 32 | Low or low-heat pressure switch did not close, or opened again | Safe checks first, then a pro |
| Carrier | 42 | Inducer motor fault | Safe checks first, then a pro |
| Carrier | 43 | Lower pressure switch open while a higher one is closed | Call a pro |
| Carrier | 14.4 | Lockout after repeated pressure switch openings | Safe checks first, then a pro |
| Carrier | 23.1 | Flue or venting fault (depends on model) | Call a pro |
| Carrier | 23.2 | Secondary pressure switch stuck closed | Call a pro |
| Carrier | 23.3 | Pressure transducer senses over-pressure | Call a pro |
| Carrier | 23.4 | Low pressure switch stuck closed | Call a pro |
| Carrier | 23.5 | High pressure switch stuck closed | Call a pro |
| Carrier | 23.6 | Medium pressure switch stuck closed | Call a pro |
| Carrier | 31.1 | Flue or venting fault (depends on model) | Depends on your model |
| Carrier | 31.2 | Flue or venting fault (depends on model) | Depends on your model |
| Carrier | 31.3 | Secondary pressure switch lockout after 3 failed trials | Safe checks first, then a pro |
| Carrier | 31.4 | Loss of pressure before the blower started | Safe checks first, then a pro |
| Carrier | 31.5 | Loss of pressure after the blower started | Safe checks first, then a pro |
| Carrier | 31.6 | High pressure switch open | Safe checks first, then a pro |
| Carrier | 31.7 | High heat only, high switch failed to close in time | Safe checks first, then a pro |
| Carrier | 32.1 | Main pressure switch (LPS) open | Safe checks first, then a pro |
| Carrier | 32.2 | Low pressure switch open | Safe checks first, then a pro |
| Carrier | 42.1 | No inducer speed at start-up | Call a pro |
| Carrier | 42.2 | Inducer speed lost while running | Call a pro |
| Carrier | 42.3 | Inducer over its speed limit | Call a pro |
| Carrier | 43.1 | High switch closed before the low switch | Call a pro |
| Goodman | E1 | Low-stage pressure switch closed at start of heating | Call a pro |
| Goodman | E2 | Low-stage pressure switch not closing | Safe checks first, then a pro |
| Goodman | E8 | High-stage pressure switch closed at start of heating | Call a pro |
| Goodman | E9 | High-stage pressure switch not closing | Safe checks first, then a pro |
| Goodman | EE1 | Pressure switch closed at start of heating | Call a pro |
| Goodman | EE2 | Pressure switch not closing | Call a pro |
| Goodman | EE8 | High-stage pressure switch closed at start of heating | Call a pro |
| Goodman | EE9 | High-stage pressure switch not closing | Call a pro |
| Goodman | 2 red flashes | Pressure switch closed when it should be open | Call a pro |
| Goodman | 3 red flashes | Pressure switch not closing | Safe checks first, then a pro |
| Goodman | 3 double red flashes | High-stage pressure switch stuck open | Call a pro |
| Goodman | 6 red flashes | Overheat / flue or venting fault (depends on model) | Depends on your model |
| Goodman | 12 red flashes | Flue or venting fault / ignition failure (depends on model) | Call a pro |