Error Code LED Off
High

Rheem RGRA-07EMAES Error Code LED Off: No Power to Control Board

TL;DR
Your Rheem RGRA furnace's control board has no power — the LED is completely off. Check the circuit breaker, furnace power switch, and access panel door switch.
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 LED Off Mean?

The LED-off status on the Rheem RGRA-07EMAES indicates that the UT Electronic Controls 1012-925 control board is not receiving any electrical power. The furnace is completely unresponsive and will not operate.

The control board requires both line voltage power and 24VAC from the transformer to function. The power LED should always be illuminated when the board has power.

The most common cause is the furnace access panel not being fully closed — many Rheem furnaces have a door safety switch that cuts power when the panel is removed or not fully seated. A tripped circuit breaker or blown fuse at your electrical panel is equally common. The furnace power switch being turned off is another simple cause. A blown fuse on the control board or a defective transformer are less common causes that require professional diagnosis.

Common Causes

Cause Likelihood DIY?
Furnace access panel not fully closed (door switch not engaged) Most common ✓ DIY fix →
Tripped circuit breaker or blown fuse Most common ✓ DIY fix →
Furnace power switch turned off Common ✓ DIY fix →
Blown fuse on control board Common ✗ Call a pro →
Defective transformer Uncommon ✗ Call a pro →

How to Fix It: Check Door Switch, Circuit Breaker, and Power Switch

⚠ Safety First
Always turn off the furnace at the power switch or breaker and shut off the gas supply before beginning. Do not proceed if you smell gas — leave the area and call your gas company immediately.

What You'll Need

Steps

  1. Turn off the gas supply valve Locate the gas shutoff valve near the furnace and turn it to the OFF position (perpendicular to the pipe). This is a precaution while troubleshooting the power issue.
  2. Verify the furnace access panel is fully seated Many Rheem furnaces have a door safety switch that cuts power when the access panel is not fully closed. Push the panel firmly into place and make sure it is fully latched.
  3. Check the circuit breaker Go to your home's electrical panel and find the breaker labeled for the furnace or HVAC system. If it is tripped (in the middle position), flip it fully to OFF, then back to ON. If it trips again immediately, do not reset it again — call an electrician.
  4. Check the furnace power switch Look for a light-style toggle switch on or near the furnace. Make sure it is in the ON position. This switch is sometimes accidentally turned off.
  5. Restore gas and test Turn the gas supply valve to ON (parallel to the pipe). Check whether the power LED on the control board is now lit. Set your thermostat to call for heat.
How to Verify
The power LED on the control board should light up. The furnace should respond to a thermostat call for heat and complete a full heating cycle.

When to Call a Professional

Contact a licensed HVAC technician if:

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Sources

  1. Rheem RGRA/RGRB/RGTA/RGRS/RGTS/RGRT Installation Instructions

✓ Verified against manufacturer service manual — March 2026