Goodman GMVC960803BN Error Code None: No Power to Furnace

What Does Code None Mean?

When the 7-segment LED display on your Goodman GMVC960803BN shows nothing at all, the integrated control module is not receiving electrical power. Without power, the furnace cannot operate in any mode — no heating, no blower, and no thermostat communication.

This condition has several possible causes. The circuit breaker for the furnace may have tripped, or the dedicated furnace disconnect switch (located near the unit) may be in the OFF position. Many Goodman furnaces also have a door safety interlock switch — if the front panel is not fully seated and latched, the switch prevents the furnace from receiving power.

If the breaker is on, the disconnect switch is on, and the door is properly closed, the problem may be a blown fuse on the control board, a faulty transformer, or a non-functional control module. These require professional diagnosis.

Common Causes

How to Fix It: Restore Power to the Furnace

What You'll Need

• Flashlight

Steps

1. Turn off power at the breaker and shut off the gas supply valve Before inspecting anything, flip the furnace circuit breaker to OFF and turn the gas shutoff valve to the OFF position (perpendicular to the gas pipe). If you smell gas at any point, leave your home immediately and call your gas company from outside.
2. Check the circuit breaker Go to your electrical panel and find the breaker labeled for the furnace or HVAC system. If it is in the middle (tripped) position, flip it fully to OFF and then back to ON. If it trips again immediately, do not reset it — call an electrician.
3. Check the furnace disconnect switch Look for a light switch or toggle switch mounted on or near the furnace. This is the local disconnect switch. Make sure it is in the ON position. It can easily be mistaken for a regular light switch and accidentally turned off.
4. Verify the furnace door panel is fully closed The Goodman GMVC960803BN has a safety interlock switch on the blower compartment door. If the door panel is not fully seated and latched, the switch cuts power to the control module. Press the door firmly until it clicks into place.
5. Restore power and gas, then check the display Turn the gas supply valve to the ON position (parallel to the pipe) and flip the circuit breaker to ON. The 7-segment display on the control module should illuminate. Set your thermostat to call for heat and verify the furnace responds.

When to Call a Professional

Contact a licensed HVAC technician if:

• The breaker trips again immediately after you reset it
• The display remains blank after confirming the breaker, disconnect switch, and door panel are all correct
• You notice a burning smell or signs of electrical damage near the furnace
• The furnace has a blown fuse on the control board (visible through the access panel)
• You are unsure about any electrical inspection — call a licensed HVAC technician

✓ Verified against manufacturer service manual — March 2026