GeneralWindows Errors

How to Fix 7 Common Goodman Furnace Error Codes Efficiently

How to Fix 7 Common Goodman Furnace Error Codes Efficiently

Understanding Goodman Furnace Error Codes

Goodman furnace error codes are typically displayed on the unit’s LED light. When the furnace experiences an issue, the LED will flash a specific sequence, representing a certain error code. It’s crucial to be able to interpret these error codes, as they provide invaluable insight into the potential issues your Goodman furnace might be experiencing. Remember, it’s always important to consult your furnace’s manual when in doubt, as different models might have slightly different codes.

Open High Limit Switch – Error Code 1

An open high limit switch often indicates that your Goodman furnace is overheating. This can occur when the heat exchanger’s temperature exceeds safe levels. When this happens, the high limit switch shuts off the furnace for safety reasons. To remedy this issue, check for a blocked air filter and replace if necessary. If the problem persists, it can point to a malfunctioning blower motor or blocked vent. In these cases, professional intervention is recommended.

Pressure Switch Stuck Closed – Error Code 2

A pressure switch stuck closed error usually indicates an issue with the furnace’s venting system. Common causes for this error include a blocked vent pipe, faulty pressure switch, or a malfunctioning inducer motor. Start by inspecting your vent pipe for blockages and clearing any found. If the problem continues, it’s best to call a professional as dealing with a faulty pressure switch or inducer motor requires technical know-how.

Ignitor Circuit Failure – Error Code 3

This error code implies that the furnace’s ignitor circuit isn’t functioning as it should. The ignitor’s role is crucial as it ignites the gas to provide heat. If the ignitor circuit fails, no ignition can occur. To fix this issue, ensure the electrical connection to the ignitor is secure. If the problem persists, you may need to replace the ignitor or control board. This is a job best left to professionals due to the complexity of the task.

Open Rollout Switch Circuit – Error Code 4

An open rollout switch circuit often indicates flame rollout, a dangerous condition where flames are not confined within the furnace. This issue requires immediate attention. Possible causes are a blocked flue or a failing heat exchanger. Check your flue for blockages and clear them. If the error persists, call a professional immediately as a failing heat exchanger must be replaced.

Flame Sense Without Gas Valve – Error Code 5

This error code indicates that the flame sensor is sensing a flame when the gas valve is closed—an impossible situation. This is often due to a faulty flame sensor or control board. You can try cleaning the flame sensor, but if the problem continues, professional assistance should be sought.

Limit Switch Open Too Long – Error Code 6

This error is triggered when the limit switch remains open for an extended period, suggesting the furnace is not heating correctly. The issue can be due to a dirty air filter, a malfunctioning blower motor, or a failing limit switch. Check and replace your air filter if necessary. If the problem persists, a professional should be consulted to diagnose and address the issue correctly.

Twinning Error, Incorrect 24V Phasing – Error Code 7

This error is specific to systems with multiple furnaces set up to operate in unison. A twinning error suggests a synchronization problem between the units. To fix this issue, you should verify all wiring is correct and in good condition. Due to the complexity of multi-furnace systems, if the problem persists, professional help is recommended.

When to Call a Goodman Furnace Professional

While some minor issues can be rectified with simple DIY solutions, others require the expertise of a professional. If you’ve attempted to troubleshoot the problem using the above tips and the issue persists, it’s time to call a professional. Additionally, if you’re dealing with a potentially hazardous situation, like a flame rollout or a failed heat exchanger, professional help should be sought immediately.

Preventative Measures for Future Goodman Error Codes

Prevention is always better than cure. Regular maintenance of your Goodman furnace can help prevent many of the error codes mentioned above. This includes regular cleaning or replacement of air filters, annual inspection by a professional, ensuring proper venting, and keeping the area around your furnace clear of debris.

Final Thoughts

Understanding Goodman furnace error codes can save you time and money by allowing you to troubleshoot minor issues yourself. However, it’s essential always to prioritize safety and call a professional when dealing with complex or potentially dangerous problems.


Q: How can I clear an error code on my Goodman furnace?
A: Resetting the furnace by turning it off and on again can often clear an error code. However, if the issue that caused the error isn’t addressed, the error code will likely return.

Q: Where can I find more information on my specific Goodman furnace model?
A: You can find detailed information about your specific model in the user manual or on the Goodman website.

Q: How often should I replace my furnace filter?
A: This can depend on the specific type of filter you’re using, but generally, it’s recommended to replace it every 60-90 days.

Q: Can I fix all Goodman furnace issues myself?
A: While some minor issues can be addressed with DIY fixes, others require professional intervention. Always prioritize safety and call a professional if you’re unsure.

This content is submitted by the contributor and we( have no control over this content and it can be not legit factual. You can modify it according to your needs.

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