Error Code RED LED2 FLASHING
Carrier 58MVP Error Code RED LED2 FLASHING: Line Voltage Polarity Reversed
TL;DR
Line voltage polarity is reversed. The hot and neutral wires are connected backwards at the furnace. This must be corrected for safe operation. 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 RED LED2 FLASHING Mean?
Line voltage polarity is reversed. The hot and neutral wires are connected backwards at the furnace. This must be corrected for safe operation.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Hot and neutral wires reversed at furnace electrical connection | Most common | ✗ Call a pro → |
| Wiring error at breaker panel or junction box | Common | ✗ 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