Troubleshooting a Goodman Furnace Circuit Board


The circuit board on a Goodman home furnace lies at the system’s center. It performs the same functions as circuit boards in other gas furnaces, including starting the motor or closing the pressure switch whenever heat is needed. Once the system ensures the operations have been safely accomplished, the circuit board allows the pilot light to ignite. Although furnaces should be installed by professionals, you can usually troubleshoot a furnace, and its circuit board, yourself.

Things You'll Need

  • Replacement circuit board wires
  • Locate the LED display panel for the furnace. This panel provides essential information. Once you locate it, ensure that the green light is on to indicate the board is functioning and the furnace has power. Alternatively, check to ensure that the furnace is plugged in if the green light is not on, or that a fuse is not blown in the main fuse box. A blown fuse will be in the off or neutral position in the box. In such a case, turn it back to the on position.

  • Read the error codes on the LED display if it is flashing. The Goodman furnace is designed to lock out the initiating process if the circuit control board encounters an error at start-up. When that occurs, the LED display begins to flash a code.

  • Count the number of flashes on the display. If the furnace senses more than one problem, it will flash a code first, and then pause before flashing a second code. The flashing will continue until you reset the display. Consult your owner’s manual for the note that corresponds to the flashing error code.

  • Turn off the supply of power to the furnace if the circuit board is malfunctioning. It's likely the circuit board is malfunctioning if the board appears not to have power even if the fuses and power supply are fine. The circuit board is typically located inside the unit’s blower compartment.

  • Inspect the circuit board thoroughly for a blown fuse. Look through the top of the fuse to determine whether it is blown. If you notice that the wires are disconnected, you need to replace the blown fuse. Ensure that no wires touch the circuit board frame if the fuse is blown. Replace any damaged or loose wires to keep the new fuse from blowing.

Tips & Warnings

  • The fuse on the furnace control board is roughly the same size as a car fuse.
  • Contact a professional service technician if the furnace feels cold to the touch or is leaking, even if the pilot light is ignited and the motor is on.
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