What does Bryant code 24 mean?
Bryant furnace code 24 means the secondary-voltage fuse is open because of a low-voltage short on the supported control family. Confirm the model number and diagnostic chart inside the furnace door before replacing parts.
What causes Bryant code 24?
- Shorted thermostat wiring
- A shorted low-voltage accessory
- A damaged control-board circuit
Can I troubleshoot Bryant code 24?
- Turn furnace power off and check for an obviously pinched thermostat wire without touching board terminals.
- Do not install a larger fuse or repeatedly replace a fuse that opens again.
How much does Bryant code 24 cost to fix?
A control board replacement typically costs between $150 and $600 nationally.
When should I call a technician?
Call a technician to locate the low-voltage short before replacing the fuse again.
Symptoms this code causes
Sources and model scope
Fault codes vary by model and control board. Confirm the diagnostic chart inside your furnace panel or the official manual before acting.
Scope used here: Carrier-family two-stage controls covered by troubleshooting guide 58-3T.
- Carrier Corporation: Deluxe 2-Stage Gas-Fired Induced-Combustion Furnaces — Troubleshooting Guide
58-3T · Carrier-family two-stage furnace controls covered by document 58-3T; codes vary on other boards and model generations.
Compiled by Warmlo Editorial · Reviewed August 2026
This is general information, not professional advice. Gas, electrical, and combustion repairs can be dangerous — when in doubt, call a licensed technician.