Ruud UGRA-07EMAES Error Code LED Steady On: Normal Operation
What Does Code LED Steady On Mean?
The IFC's microprocessor status LED glows steady when the board is powered and has no fault stored. Unlike the blink codes, which flash a specific count for each fault, a solid, unbroken light simply confirms the control side of this single-stage furnace is healthy and either running a heat cycle or idling in standby.
If the furnace isn't heating even though the status LED is steady, the control board isn't the problem — attention should shift to the inputs and outputs it depends on, like the thermostat setting and wiring or a heat call that isn't reaching the board. A steady status LED is also the counterpart to the dark power LED (no power) and to the separate amber flame-sense LED: a steady green status light alongside a slow-flashing amber flame light still means the board is fine, just that the flame signal is marginal.
What You'll Notice
- The control board's status LED glows steady and unbroken, not flashing a count.
- The furnace responds normally to the thermostat, running heat cycles without lockouts.
How This Is Diagnosed
There is nothing to repair for a steady LED, but if the house still isn't warming, the basics are confirmed in order: the thermostat is set to Heat and above room temperature, the thermostat has power or fresh batteries, and a heat call is actually reaching the furnace. Because the status LED already shows the board is healthy, the check moves to the thermostat and its wiring rather than the control board itself.
- The status LED is steady but the furnace still won't produce heat after the thermostat is confirmed set to Heat and above room temperature
- You want the separate amber flame-sense LED interpreted, since it reports flame current independently of this status light
Frequently Asked Questions
Is a solid light on my furnace control board good or bad?
Good — a steady status LED means the control board is powered and running with no fault detected.
My furnace board light is on but there's no heat — why?
The board is fine, so the issue is usually elsewhere: check that the thermostat is set to Heat above room temperature and has power, and that it's actually calling the furnace.
What's the difference between the steady green light and the amber light?
The green status LED shows the board's overall health; the separate amber flame-sense LED reports how strong the burner flame signal is.
Sources
✓ Verified against manufacturer service manual — March 2026