Rheem RGRA-07EMAES Error Code Flame LED Slow Blink: Marginal Flame Sense Current

What Does Code Flame LED Slow Blink Mean?

A slow blink of the amber FLAME LED on the Rheem RGRA-07EMAES is the UTEC 1012-925 Integrated Furnace Control (IFC) warning that the flame sensor is detecting a weak or marginal flame current. The sensor works by passing a tiny microamp current through the flame to prove the burners are lit. When that signal drops toward the control's minimum threshold, the FLAME LED slows from a steady glow to a slow blink.

This is an early-warning state rather than a hard fault, which is why its severity is lower than the blink codes on the green STATUS LED. On this single-stage furnace the flame sensor has to confirm a full-rate flame within the board's short proving window, so a marginal signal often causes intermittent, unexplained shutdowns before it fully fails. If the signal keeps degrading, the board can miss the flame entirely and escalate to the 1-blink green STATUS LED soft lockout — the two codes are the mild and severe ends of the same flame-sensing problem.

The most common cause is a flame sensor coated with oxide or carbon buildup that insulates the rod and weakens the current. Less common causes are poor flame carry-over between burners, a weak flame from low gas pressure, or a poor ground connection — those last few are technician diagnoses. Cleaning the rod is the standard first fix and is homeowner-safe.

What You'll Notice

• The amber FLAME LED blinks slowly instead of glowing steady while the burners are lit
• The furnace lights but sometimes shuts down partway through a cycle for no obvious reason
• Occasional short cycling or nuisance dropouts that come and go
• The furnace runs fine some cycles and stumbles on others as the signal drifts near the threshold
• If left long enough, the fault escalates to a 1-blink green STATUS LED soft lockout

Common Causes

How This Is Diagnosed

The logical first step is the flame sensor, because a dirty rod is by far the most common cause of a marginal signal. With power off, the sensor is removed, cleaned, reinstalled, and the furnace is watched to see whether the amber FLAME LED returns to steady during the next flame.

If cleaning does not restore a strong signal, a technician looks further: checking flame carry-over across the burners, confirming gas pressure is adequate for a full flame, and verifying the burner and control grounding, since a poor ground weakens the sensed current. If the flame and ground check out, the IFC itself may be at fault. Those deeper checks involve gas and electrical testing and are not homeowner steps.

How to Fix It: Clean the Flame Sensor

What You'll Need

• 1/4-inch hex head or nut driver
• Scotch-Brite pad
• Flashlight

Steps

1. Turn off electrical power at the breaker and shut off the gas supply valve Set the furnace circuit breaker (or the furnace power switch) to OFF, then turn the manual gas shutoff valve to OFF. If you smell gas, leave immediately and call your gas company.
2. Open the access panel and locate the flame sensor Remove the burner-compartment access panel. The flame sensor is a thin metal rod near the far end of the burners, mounted on a white porcelain insulator with a single wire and one mounting screw.
3. Remove the flame sensor Disconnect the wire, remove the mounting screw, and gently pull the sensor out. Hold it by the porcelain base or bracket, never by the rod.
4. Clean the sensor rod Gently clean the flame sensor rod with a Scotch-Brite pad until the metal is dull-bright. Rheem's guide lists fine steel wool as the cleaning material, but many HVAC technicians prefer a Scotch-Brite pad because it leaves no abrasive residue on the rod. Do not clean or scratch the white porcelain base, and take care not to bend the rod.
5. Reinstall the flame sensor Seat the sensor back in its bracket, secure the mounting screw, and reconnect the wire, making sure the rod sits in the flame path.
6. Restore power and test Turn the gas valve back ON and the breaker or power switch to ON, then set the thermostat to call for heat and watch the amber FLAME LED once the burners light.

When to Call a Professional

Contact a licensed HVAC technician if:

• The amber FLAME LED still blinks slowly after the flame sensor has been cleaned
• The furnace keeps dropping out mid-cycle or has escalated to a 1-blink soft lockout
• The flame looks weak, yellow, or does not carry evenly across all burners
• You suspect low gas pressure or a poor burner ground is weakening the flame signal
• The signal returns to marginal soon after a cleaning, suggesting a deeper fault

✓ Verified against manufacturer service manual — March 2026