Goodman gas furnaces are known for their reliability and efficiency, providing consistent warmth during colder months. However, like any mechanical system, they may encounter issues that require troubleshooting. Fortunately, Goodman furnaces are equipped with error codes that make it easier for homeowners to identify and resolve problems. In this article, we’ll focus on Goodman furnace troubleshooting, guiding you through the most common error codes and offering practical solutions to get your system back in optimal condition.
Common Goodman Furnace Error Codes and Troubleshooting Solutions
Here are the common Goodman furnace error codes and troubleshooting solutions to help you identify and resolve issues quickly.
1.Ignition Failure (3 Flashes)
Three flashes typically indicate an ignition failure. This occurs when the furnace is unable to ignite the burner due to a dirty or faulty ignition electrode, blocked gas flow, or a malfunctioning control board.
Troubleshooting:
- Clean or Replace the Ignition Electrode: If the electrode is dirty or damaged, clean it with a soft cloth or replace it if necessary.
- Ensure Proper Gas Flow: Verify that the gas supply valve is open and that there are no blockages in the gas line.
- Inspect the Control Board: If the ignition electrode is fine and the gas flow is good, the control board may be malfunctioning. This might require professional inspection and replacement.
2.Limit Switch Error (4 Flashes)
Four flashes indicate a limit switch error, often caused by overheating or restricted airflow. This could be due to a clogged air filter, malfunctioning blower motor, or blocked ductwork/vents.
Troubleshooting:
- Replace the Air Filter: A clogged air filter can restrict airflow and cause the furnace to overheat. Replace the filter if necessary.
- Check the Blower Motor: Inspect the blower motor to ensure it is running properly. If the motor is malfunctioning, it may need lubrication or replacement.
- Clear Venting and Ductwork: Make sure all vents and ducts are free of obstructions to allow proper airflow and prevent overheating.
3.Flame Rollout Error (5 Flashes)
Five flashes indicate a flame rollout issue, which occurs when flames escape from the combustion chamber. This is often due to a cracked heat exchanger, a blocked vent system, or a faulty flame sensor.
Troubleshooting:
- Inspect the Heat Exchanger: A cracked heat exchanger is a serious safety concern and requires professional repair or replacement.
- Clear the Venting System: Ensure that the exhaust and intake vents are clear of blockages that could cause improper combustion.
- Clean or Replace the Flame Sensor: A dirty or malfunctioning flame sensor can lead to improper flame sensing, causing the furnace to shut down. Clean or replace the sensor if needed.
4.Open Rollout Switch (6 Flashes)
Six flashes indicate an open rollout switch, which can occur if flames escape from the combustion chamber, often caused by a blocked vent, a cracked heat exchanger, or a dirty flame sensor.
Troubleshooting:
- Inspect the Heat Exchanger: A cracked heat exchanger is a serious issue and requires professional inspection and repair.
- Clear the Venting System: Blocked exhaust or intake vents can cause improper combustion. Make sure all vents are clear of debris or obstructions.
- Clean or Replace the Flame Sensor: If the flame sensor is dirty or faulty, it can contribute to this issue. Clean or replace it as needed.
5.Low Flame Signal (7 Flashes)
Seven flashes indicate a low flame signal. This occurs when the flame signal is too weak to be detected by the furnace control board. Common causes include a dirty flame sensor, misaligned burners, or issues with the gas supply.
Troubleshooting:
- Clean the Flame Sensor: A dirty flame sensor can result in weak flame signals. Clean it carefully or replace it if needed.
- Check the Burners: Misaligned or dirty burners can cause weak flames. Inspect and clean the burners if necessary.
- Ensure Proper Gas Supply: Verify that the gas supply to the furnace is adequate and that there are no blockages in the gas line.
6.Igniter Circuit Failure (8 Flashes)
Eight flashes indicate an igniter circuit failure, which typically happens when the igniter fails to operate correctly. This can be caused by a faulty igniter, damaged wiring, or a malfunctioning control board.
Troubleshooting:
- Inspect the Igniter: Check the igniter for cracks or visible damage. If it’s broken, replace it with a new one.
- Examine the Wiring: Ensure that all wiring to the igniter is secure and free of damage. Repair or replace any faulty connections.
- Inspect the Control Board: If the igniter and wiring appear intact, the issue may lie with the control board, which may need to be replaced.
7.Open Pressure Switch (9 Flashes)
Nine flashes indicate an open pressure switch. This usually occurs when there is an issue with the inducer motor, blocked venting, or a faulty pressure switch. The pressure switch ensures the furnace is venting properly.
Troubleshooting:
- Clear the Venting System: Blocked vents or exhaust pipes can prevent the pressure switch from reading correctly. Inspect and clear any obstructions in the venting system.
- Test the Pressure Switch: If the vents are clear, the pressure switch may be faulty. It may need to be tested and replaced by a professional.
- Inspect the Inducer Motor: The inducer motor is responsible for moving air through the furnace and out the vent. If it’s malfunctioning, it can affect the pressure switch. Inspect and repair or replace the inducer motor as needed.
Goodman furnace troubleshooting can seem challenging, but by understanding the error codes and their causes, you can resolve many common issues efficiently. Regular maintenance and addressing error codes promptly will keep your furnace running smoothly. If the problem persists or is beyond your expertise, contacting a professional HVAC technician is always a smart choice.
Written by Allen Rode for Partshnc, your trusted source for high-quality HVAC parts, including water heater components, air conditioner parts, and heat pump solutions
