Error Code Status Code 24

Carrier 58MVC Error Code Status Code 24: Secondary Voltage Fuse Is Open

TL;DR

Check for short circuit in secondary voltage (24 VAC) wiring.

Disclaimer

This article is for informational purposes only and does not guarantee the accuracy or completeness of the information provided. Always turn off power and gas supply before attempting any repairs. If you smell gas, leave immediately and call your gas company. Consult a licensed HVAC technician for diagnosis and repair. Any actions taken based on this information are at your own risk.

What Does Code Status Code 24 Mean?

Check for short circuit in secondary voltage (24 VAC) wiring.

Common Causes

Cause	Likelihood	DIY?
Short circuit in 24 VAC secondary wiring		✗ Call a pro →
Shorted thermostat wiring		✗ Call a pro →
Defective external component drawing excessive current		✗ Call a pro →

When to Call a Professional

Contact a licensed HVAC technician if:

Basic troubleshooting did not resolve the error
You smell gas at any point during the process
You are not comfortable working around gas lines or electrical components
The unit needs a gas valve, control board, or motor replacement

Sources

Carrier 58MVC Series 100 Troubleshooting Guide, p.8