Vents and snow
Goodman IOG-2037B requires every vent and intake termination to be at least 12 inches above ground level or the anticipated snow level. The same guide's EE2 corrective action is to inspect the flue and inlet air piping for blockage. Goodman IOG-2037B (opens in a new tab) ↗
Codes that name it
Amana
- Amana furnace EE0:
Front cover pressure switch or condensate drainage problem
Amana and Goodman *CVC96 / *MVC96 two-stage furnace installation instructions (IOG-2015L) (opens in a new tab) ↗ - Amana furnace EE2:
Pressure switch hose blocked, pinched, or connected improperly
Amana and Goodman *CVC96 / *MVC96 two-stage furnace installation instructions (IOG-2015L) (opens in a new tab) ↗ - Amana furnace EE8:
High stage pressure switch contacts sticking
Amana and Goodman *CVC96 / *MVC96 two-stage furnace installation instructions (IOG-2015L) (opens in a new tab) ↗ - Amana furnace EE9:
Pressure switch hose blocked, pinched, or needing repair
Amana and Goodman *CVC96 / *MVC96 two-stage furnace installation instructions (IOG-2015L) (opens in a new tab) ↗
American Standard
- American Standard furnace E3.1:
1st stage pressure switch circuit shorted
American Standard S9V2 installer's guide (18-CE01D1-1E-EN) (opens in a new tab) ↗ - American Standard furnace E3.2:
1st stage pressure switch did not close
American Standard S9V2 installer's guide (18-CE01D1-1E-EN) (opens in a new tab) ↗ - American Standard furnace E3.4:
2nd stage pressure switch did not close
American Standard S9V2 installer's guide (18-CE01D1-1E-EN) (opens in a new tab) ↗
Bryant
- Bryant furnace 23:
Pressure switch stuck closed
Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02) (opens in a new tab) ↗ - Bryant furnace 31:
High-heat pressure switch or relay did not close or reopened
Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02) (opens in a new tab) ↗ - Bryant furnace 32:
Defective pressure switch
Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02) (opens in a new tab) ↗ - Bryant furnace 43:
Low inlet gas pressure, if a low-gas-pressure switch is used
Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02) (opens in a new tab) ↗
Carrier
- Carrier furnace 23:
Pressure switch stuck closed
Carrier 59SC5 installation, start-up and operating instructions (opens in a new tab) ↗ - Carrier furnace 31:
Defective or miswired pressure switch
Carrier 59SC5 installation, start-up and operating instructions (opens in a new tab) ↗
Goodman
- Goodman furnace EE0:
Front cover pressure switch or condensate drainage problem
Goodman GR9S96/GD9S96 installation and operating guide (IOG-2037B) (opens in a new tab) ↗ - Goodman furnace EE1:
Pressure switch contacts sticking
Goodman GR9S96/GD9S96 installation and operating guide (IOG-2037B) (opens in a new tab) ↗ - Goodman furnace EE2:
Pressure switch hose blocked, pinched or connected improperly
Goodman GR9S96/GD9S96 installation and operating guide (IOG-2037B) (opens in a new tab) ↗
Lennox
Rheem
- Rheem furnace 44:
Pressure switch bypassed in the field
Rheem R96V installation instructions (92-24161-124-03) (opens in a new tab) ↗ - Rheem furnace 45:
Disconnected, blocked, split or cut pressure switch hoses
Rheem R96V installation instructions (92-24161-124-03) (opens in a new tab) ↗ - Rheem furnace 46:
Damaged pressure switch hoses
Rheem R96V installation instructions (92-24161-124-03) (opens in a new tab) ↗ - Rheem furnace 55:
Faulty high pressure switch
Rheem (-)96V series installation instructions 92-24161-124-03, Table 20 R96V fault codes. Read 2026-11-07 (opens in a new tab) ↗ - Rheem furnace 57:
Damaged pressure switch hoses
Rheem R96V installation instructions (92-24161-124-03) (opens in a new tab) ↗
Trane
- Trane furnace E3.1:
Pressure switch wiring or tube routing incorrect
Trane S9V2 Service Facts (S9V2-SF-2A-EN) (opens in a new tab) ↗ - Trane furnace E3.2:
Obstructed pressure switch hose or flue piping, or incorrect vent size
Trane S9V2 Service Facts (S9V2-SF-2A-EN) (opens in a new tab) ↗ - Trane furnace E3.3:
2nd stage pressure switch PS2 is closed when it should be open. The service facts say the pressure switch is not the problem in most cases.
Trane S9V2 Service Facts S9V2-SF-2A-EN (04 Mar 2021), troubleshooting section. Read 2026-11-07 (opens in a new tab) ↗ - Trane furnace E3.4:
Obstructed pressure switch hose or flue piping, or incorrect vent size
Trane S9V2 Service Facts (S9V2-SF-2A-EN) (opens in a new tab) ↗
York
- York furnace 2 red flashes:
A faulty pressure switch
York TG9S installation manual (Johnson Controls 1083287-UIM-C-0715) (opens in a new tab) ↗ - York furnace 3 red flashes:
Broken pressure switch hose
York TG9S installation manual (Johnson Controls 1083287-UIM-C-0715) (opens in a new tab) ↗ - York furnace 6 red flashes:
Faulty pressure switch
York TG9S installation manual (Johnson Controls 1083287-UIM-C-0715) (opens in a new tab) ↗
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Unplug the furnace or switch it off at the breaker, and shut off the gas supply where relevant, before you open any panel. Capacitors can hold a charge after power is off. Gas, electrical-panel, refrigerant and carbon-monoxide work belongs to a licensed professional. Follow the manual for your model (safety terms).