Error Code 4 Blinks (2-sec pause)
Ruud UGPH-07EAMGR Error Code 4 Blinks (2-sec pause): 4 Blinks (2-sec pause)
TL;DR
The pressure switch is stuck in the closed position when it should be open. The control board expects the pressure switch to be open before the induced draft motor starts. A shorted switch prevents the board from verifying proper venting. 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 4 Blinks (2-sec pause) Mean?
The pressure switch is stuck in the closed position when it should be open. The control board expects the pressure switch to be open before the induced draft motor starts. A shorted switch prevents the board from verifying proper venting.
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