Goodman GMEC960803BN Error Code No LED Signal: No Power

What Does Code No LED Signal Mean?

A totally dark diagnostic LED on the Goodman GMEC960803BN is different from any flash code. The Integrated Control Module uses a tri-color LED (green, amber, red) to report status, and even in an idle, healthy state it shows a solid green "standby" light. If nothing is lit at all, the board itself is not receiving power — so it cannot light any color, let alone flash a fault.

This two-stage 96% furnace board needs both 115-volt line power and 24-volt control power to operate. Missing 115V (a tripped breaker or an OFF disconnect) or missing 24V (a transformer or wiring problem) will leave the LED dark. The GMEC96 also runs its line power through a blower-door safety switch: if the lower access door is not seated firmly, the switch stays open and the board never powers up, exactly as if the breaker were off.

The most common causes are things a homeowner can safely check — a tripped breaker, the furnace disconnect switch left in the OFF position after service, or a door that popped loose after a filter change. A genuine loss of supply voltage (failed transformer, damaged wiring, or a utility issue) is not a DIY repair and needs a technician.

What You'll Notice

• The furnace is completely unresponsive — no blower, no ignition, no sound when the thermostat calls for heat
• The diagnostic LED on the control board shows no light of any color (not even green standby)
• The blower-compartment access door may be sitting slightly open or was recently removed
• The furnace switch or breaker was recently turned off for service or tripped during a storm
• A thermostat powered from the furnace's 24V transformer may show a blank display

Common Causes

How This Is Diagnosed

Because a dark LED means no power reaches the board, diagnosis works from the incoming supply inward. First the obvious external power sources are confirmed: the circuit breaker, the furnace disconnect switch, and the blower-door safety switch that must be closed for line power to pass. If all three are correct and the LED is still dark, a technician measures 115V at the board's line input and 24V at the transformer secondary to find where the supply is lost.

How to Fix It: Restore Power to the Furnace

What You'll Need

• Flashlight

Steps

1. Turn off power at the breaker or switch and shut off the gas supply Before inspecting the furnace, switch the furnace circuit breaker OFF and turn the gas shutoff valve to OFF (handle perpendicular to the pipe). If you smell gas, leave immediately and call your gas company.
2. Check and reset the circuit breaker At the electrical panel, find the breaker labeled for the furnace. If it is tripped (sitting between ON and OFF), push it fully OFF and then back ON. A breaker that trips again right away points to an electrical fault and should be left for a professional.
3. Confirm the furnace disconnect switch is ON There is usually a light-switch-style disconnect on or near the furnace. Make sure it is in the ON position — it is often switched off during service and forgotten.
4. Seat the blower access door fully Push the lower blower-compartment door firmly into place so it presses in the door safety switch. The GMEC96 will not power its board unless this door is fully closed. Make sure no filter or panel is holding the door slightly open.
5. Restore power and check the LED Turn the gas valve back ON (handle parallel to the pipe) and the breaker/disconnect back ON. Watch the control board — it should light to a solid green standby light within a few seconds.

When to Call a Professional

Contact a licensed HVAC technician if:

• The breaker trips again immediately after you reset it
• The LED stays dark after you confirm the breaker, disconnect, and blower door are all correct
• You notice a burnt smell, scorched wiring, or discoloration near the control board or transformer
• The disconnect switch or outlet feels warm or shows signs of arcing

✓ Verified against manufacturer service manual — March 2026