Codes that name it
Amana
American Standard
- American Standard furnace E12:
Open fuse on the furnace control
American Standard S9V2 installer's guide (18-CE01D1-1E-EN) (opens in a new tab) ↗
Bryant
- Bryant furnace 24:
Secondary voltage fuse is open. The chart says to check for a short circuit in the secondary (24 V) wiring.
Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02) (opens in a new tab) ↗
Carrier
- Carrier furnace 24:
Secondary voltage (24 V) fuse is open.
Carrier 59SC5 installation, start-up and operating instructions (opens in a new tab) ↗
Goodman
Rheem
- Rheem furnace 30:
Open fuse, usually from a 24 VAC short to common or ground.
Rheem R96V installation instructions (92-24161-124-03) (opens in a new tab) ↗
Trane
- Trane furnace E12:
Accessory drawing more than the fuse rating
Trane S9V2 Service Facts (S9V2-SF-2A-EN) (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).