Error Code 1 Blink (2-sec pause)

Ruud UGPH-07EAMGR Error Code 1 Blink (2-sec pause): 1 Blink (2-sec pause)

TL;DR
The furnace has failed to ignite after 4 attempts and has entered a 1-hour safety lockout. The system attempted ignition 4 times with voltage present at the gas valve for only 9 seconds during each trial. After the lockout period, the system will automatically retry.
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 1 Blink (2-sec pause) Mean?

The furnace has failed to ignite after 4 attempts and has entered a 1-hour safety lockout. The system attempted ignition 4 times with voltage present at the gas valve for only 9 seconds during each trial. After the lockout period, the system will automatically retry.

When to Call a Professional

Contact a licensed HVAC technician if:

Sources

  1. Rheem RGPH Installation Instructions Manual (covers Ruud UGPH)