Error Code Code 24
Carrier 58MVP Error Code Code 24: Secondary Voltage Fuse Is Open
TL;DR
Indicates the secondary voltage (24V) fuse is open. There is a short circuit in the secondary voltage wiring. This can be an intermittent problem. Check outdoor unit contactor — failure to pull in can cause excessive current draw on the low-voltage circuit. 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 Code 24 Mean?
Indicates the secondary voltage (24V) fuse is open. There is a short circuit in the secondary voltage wiring. This can be an intermittent problem. Check outdoor unit contactor — failure to pull in can cause excessive current draw on the low-voltage circuit.
Common Causes
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