Codes that name it
Amana
American Standard
- American Standard furnace E2.3:
1st stage gas valve not energized on a call when the control expected it
American Standard S9V2 installer's guide (18-CE01D1-1E-EN) (opens in a new tab) ↗ - American Standard furnace E7.1:
1st stage gas valve energized with no call for it to be on
American Standard S9V2 installer's guide (18-CE01D1-1E-EN) (opens in a new tab) ↗
Bryant
- Bryant furnace 21:
Mis-wired gas valve
Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02) (opens in a new tab) ↗ - Bryant furnace 22:
Leaky gas valve
Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02) (opens in a new tab) ↗ - Bryant furnace 31:
Gas valve may be mis-wired
Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02) (opens in a new tab) ↗ - Bryant furnace 34:
Gas valve defective, turned off, or the manual valve shut off
Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02) (opens in a new tab) ↗ - Bryant furnace 35:
Intermittent red, yellow, or orange wire at the gas valve
Bryant 987MA Series A modulating furnace troubleshooting guide (Form 987MA-01T) (opens in a new tab) ↗
Carrier
- Carrier furnace 22:
Leaky gas valve
Carrier 59SC5 installation, start-up and operating instructions (opens in a new tab) ↗ - Carrier furnace 34:
Gas valve defective or turned off, or manual shut-off valve closed
Carrier 59SC5 installation, start-up and operating instructions (opens in a new tab) ↗
Goodman
Lennox
- Lennox furnace Red slow flash, green off:
Flame present with gas valve de-energized
Lennox ML180UH installation and operation manual (opens in a new tab) ↗
Rheem
- Rheem furnace 14:
Field mis-wiring of 24 VAC to gas valve
Rheem R96V installation instructions (92-24161-124-03) (opens in a new tab) ↗
Trane
- Trane furnace E2.1:
Gas valve switch OFF, no voltage to gas valve, or debris in gas valve
Trane S9V2 Service Facts (S9V2-SF-2A-EN) (opens in a new tab) ↗ - Trane furnace E05:
Moisture or debris in gas valve inlet screen / faulty gas valve
Trane S9V2 Service Facts (S9V2-SF-2A-EN) (opens in a new tab) ↗ - Trane furnace E11:
24 VAC sensed at the 2nd stage gas valve
Trane S9V2 Service Facts S9V2-SF-2A-EN (04 Mar 2021), troubleshooting section. Read 2026-11-07 (opens in a new tab) ↗
York
- York furnace 1 red flash:
A leaking or slow-closing gas valve
York TG9S installation manual (Johnson Controls 1083287-UIM-C-0715) (opens in a new tab) ↗ - York furnace 7 red flashes:
Gas valve switch not in the ON position
York TG9S installation manual (Johnson Controls 1083287-UIM-C-0715) (opens in a new tab) ↗ - York furnace 8 red flashes:
Faulty gas valve
York TG9S installation manual (Johnson Controls 1083287-UIM-C-0715) (opens in a new tab) ↗ - York furnace 10 red flashes:
Gas valve fault
York TG9S installation manual (Johnson Controls 1083287-UIM-C-0715) (opens in a new tab) ↗
Technician part
Goodman IOG-2037B says installation and service must be performed by a qualified installer, service agency or the gas supplier. This page does not link a replacement gas valve.
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).