Error Code YELLOW LED3 ON (solid)
Carrier 58MVP Error Code YELLOW LED3 ON (solid): High Heat Operation
TL;DR
Furnace is operating in high heat mode. This is a normal operating indicator, not a fault condition. 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 YELLOW LED3 ON (solid) Mean?
Furnace is operating in high heat mode. This is a normal operating indicator, not a fault condition.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Thermostat calling for high-stage heating (normal operation) | Most common | — N/A |
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