Goodman GMEC960803BN Error Code No LED Signal: No Power
What Does Code No LED Signal Mean?
When the control board LED on your Goodman GMEC960803BN is completely off, it means the furnace is not receiving electrical power. Without power, the furnace cannot operate at all — no heating, no fan, and no diagnostic information.
The most common cause is a tripped circuit breaker or a furnace disconnect switch that has been turned off. This can happen after a power surge, during maintenance, or simply by accident. The furnace also has a door safety switch that cuts power when the blower compartment door is removed or not fully seated.
Less common causes include a blown fuse on the control board or a complete loss of the 24-volt transformer power supply. If the breaker trips repeatedly when reset, there may be an electrical short in the furnace wiring that requires professional diagnosis.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Tripped circuit breaker or disconnect switch off | Most common | ✓ DIY fix → |
| Door switch not engaged | Common | ✓ DIY fix → |
| No 115V or 24V power supply | Common | ✗ Call a pro → |
How to Fix It: Check the Circuit Breaker, Disconnect Switch, and Door Switch
What You'll Need
Steps
- Turn off electrical power and gas supply Before working near the furnace, turn the gas shutoff valve to the OFF position (handle perpendicular to the pipe). If you smell gas at any point, leave immediately and call your gas company.
- 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 in the tripped position (middle), flip it fully to OFF, then back to ON. If it trips again immediately, do not force it — there may be a short circuit that needs professional repair.
- Check the furnace disconnect switch Look for a power switch on or near the furnace — it often looks like a standard light switch and may be mounted on the side of the furnace or on a nearby wall. Make sure it is in the ON position.
- Verify the furnace door is fully closed The blower compartment door has a safety switch that cuts power when the door is open. Press the door firmly until it clicks into place. On some models, the door must be pushed in and slid upward to fully engage.
- Restore gas and test Turn the gas supply valve back to ON (handle parallel to the pipe). The control board LED should illuminate. Set the thermostat to call for heat and verify the furnace starts normally.
When to Call a Professional
Contact a licensed HVAC technician if:
- The circuit breaker trips again immediately after resetting
- The breaker is on, the switch is on, the door is closed, but the LED is still off
- You notice a burning smell coming from the furnace
- The control board fuse appears blown (visible through the door panel)
✓ Verified against manufacturer service manual — March 2026