Error Code Rapid Flashing
Carrier 59SC5A Error Code Rapid Flashing: Line Voltage Polarity Reversed
TL;DR
Line voltage (115VAC) polarity is reversed. If twinned, refer to twinning kit instructions. 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 Rapid Flashing Mean?
Line voltage (115VAC) polarity is reversed. If twinned, refer to twinning kit instructions.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| 115VAC hot and neutral wires reversed | Most common | ✗ Call a pro → |
| Twinning kit wiring error | Uncommon | ✗ 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