Codes that name it
Amana
- Amana furnace EE7:
Igniter relay fault on the integrated control module
Amana and Goodman *CVC96 / *MVC96 two-stage furnace installation instructions (IOG-2015L) (opens in a new tab) ↗
Bryant
- Bryant furnace 21:
Defective control valve relay
Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02) (opens in a new tab) ↗ - Bryant furnace 45:
Control circuitry lockout. The control auto-resets after a 1-hour lockout caused by a flame-sense circuit failure, a gas-valve relay stuck open, or a software check error. Reset power to clear the lockout. Replace the control if the code repeats.
Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02) (opens in a new tab) ↗
Carrier
- Carrier furnace 21:
Stuck closed gas valve relay on control (defective control)
Carrier 59SC5 installation, start-up and operating instructions (opens in a new tab) ↗ - Carrier furnace 45:
Technician: replace the control if the status code repeats
Carrier 59SC5 installation, start-up and operating instructions (opens in a new tab) ↗
Goodman
- Goodman furnace Ear:
A2L relay fault on the furnace control board
Goodman *R9S96/*D9S96 and *R9S92 single-stage gas furnace installation instructions (IOG-2037B), 1-stage troubleshooting codes. Read 2026-11-07 (opens in a new tab) ↗ - Goodman furnace EEb:
Technician: replace integrated control board if wiring is good
Goodman GR9S96/GD9S96 installation and operating guide (IOG-2037B) (opens in a new tab) ↗ - Goodman furnace EEC:
Technician: replace integrated control board if wiring is good
Goodman GR9S96/GD9S96 installation and operating guide (IOG-2037B) (opens in a new tab) ↗ - Goodman furnace EEE:
Internal control board fault
Goodman GR9S96/GD9S96 installation and operating guide (IOG-2037B) (opens in a new tab) ↗ - Goodman furnace EEH:
Integrated control board
Goodman *R9S96/*D9S96 and *R9S92 single-stage gas furnace installation instructions (IOG-2037B), 1-stage troubleshooting codes. Read 2026-11-07 (opens in a new tab) ↗ - Goodman furnace EEJ:
Inducer relay error on the integrated control
Goodman *R9S96/*D9S96 and *R9S92 single-stage gas furnace installation instructions (IOG-2037B), 1-stage troubleshooting codes. Read 2026-11-07 (opens in a new tab) ↗ - Goodman furnace EEL:
Igniter relay fault on integrated control module
Goodman GR9S96/GD9S96 installation and operating guide (IOG-2037B) (opens in a new tab) ↗
Lennox
- Lennox furnace Board failure pattern:
Integrated control failure
Lennox ML180UH installation and operation manual (opens in a new tab) ↗
Rheem
- Rheem furnace 45:
Faulty control board (inducer relay)
Rheem R96V installation instructions (92-24161-124-03) (opens in a new tab) ↗ - Rheem furnace 46:
Faulty control board
Rheem R96V installation instructions (92-24161-124-03) (opens in a new tab) ↗ - Rheem furnace 57:
Faulty control board
Rheem R96V installation instructions (92-24161-124-03) (opens in a new tab) ↗
Trane
- Trane furnace E01:
Internal failure of the control board
Trane S9V2 Service Facts (S9V2-SF-2A-EN) (opens in a new tab) ↗ - Trane furnace E6.3:
Technician: check igniter resistance (37-70 ohms at ~75F); replace igniter or IFC as indicated
Trane S9V2 Service Facts (S9V2-SF-2A-EN) (opens in a new tab) ↗ - Trane furnace E7.1:
Technician: check for 24 VAC at gas valve with no heat call; correct wiring or replace IFC
Trane S9V2 Service Facts (S9V2-SF-2A-EN) (opens in a new tab) ↗ - Trane furnace E14:
Do not pull the control board to look for the module with power on
Trane S9V2 Service Facts S9V2-SF-2A-EN (04 Mar 2021), troubleshooting section. Read 2026-11-07 (opens in a new tab) ↗ - Trane furnace E15:
Technician: the chart's possible causes are a corrupted personality module and a faulty IFC. It does not list a filter or a gas-valve check
Trane S9V2 Service Facts S9V2-SF-2A-EN (04 Mar 2021), troubleshooting section. Read 2026-11-07 (opens in a new tab) ↗ - Trane furnace E18:
Technician: with power on, remove the 4-pin motor connector from the IFC. If the code changes to E17, verify the harness and wiring. If it does not change, replace the IFC
Trane S9V2 Service Facts S9V2-SF-2A-EN (04 Mar 2021), troubleshooting section. Read 2026-11-07 (opens in a new tab) ↗
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Safety first
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).