Goodman Furnace Error Codes

Posted by: Mas Broto
Goodman Furnace Error Codes

Goodman furnace is equipped with a self-diagnosing electronic control module. In the event a furnace component is not operating properly, the control module LED will flash on and off, depending on the problem encountered. These Goodman furnace error codes can help you locate exact issues to make furnace repairs faster and more cost-effective.

Before you call an HVAC technician, you might have common issues that will be easy to fix yourself. We will show you how to read your Goodman furnace error codes.

Goodman furnaces are equipped with a self-diagnostic system that greatly aids in troubleshooting. The display panel, shows error codes through a series of LED light flashes.

The display panel is typically located on the blower door or the exterior of the furnace. This panel, often referred to as the control board or diagnostic panel, features a small window or a clear plastic cover through which you can view the LED lights. These lights blink in specific patterns to indicate various error codes.

Goodman furnace display panel shows error codes

When troubleshooting, it’s important to observe the sequence and number of flashes, as these correspond to different error messages.

The LED will turn itself off for a few seconds before blinking the code once more. Count the number of times that the LED flash before staying off for a few seconds. The number of flashes is your error code.

Here’s a list of common Goodman furnace error codes, their meanings, and suggestions on how to fix them:

Error CodePotential ProblemsWhat to do
Single LED flash, steadily onYour Goodman furnace has no signal coming from the thermostat and won’t operate.Check your thermostat for an improper setting or connection.
Single LED flash, blinks on and offYour furnace has locked out due to too many ignition attempts.After one hour of lockout, your furnace will automatically reset itself.
2 LED flashesThe draft blower isn’t functioning properly, or your furnace has a short in the pressure switch circuit.You should either repair the short or replace the pressure switch.
3 LED flashesYour furnace has an open pressure switch circuit or the induced draft blower is operating when it shouldn’t be.Check the pressure switch hose for blocks or an improper connection. Otherwise, see if any loose wiring needs tightening.
4 LED flashesYour furnace has a primary open limit circuit.Check and clean all the filters, tighten the wiring, and see if there are any blockages in the flue.
5 LED flashesYour furnace senses a flame without a call for heat.Check for a leaky or open gas valve or a lingering burner flame.
7 LED flashesWarns of a low flame sense microamp signal. This is the result of a coated flame sensor or a lazy flame due to poor gas pressure.Adjust the gas pressure according to the information available to you.
8 LED flashesYour furnace has an igniter circuit problem due to a defective igniter or an improperly connected igniter.Replace the igniter or check the ground wiring for defects.
9 LED flashesYour furnace has a high-stage pressure switch that won’t close during a high-stage-induced draft blower operation.Check your Goodman furnace for a pinched or blocked pressure switch hose.
Continuous LED flashesYour furnace has a reversed polarity of 115 volts.You will have to correct the wiring polarity after reviewing the wiring diagram.

Troubleshooting Tips

In my two decades as a professional in the HVAC industry, I’ve seen Goodman furnaces stand out as some of the most reliable units on the market. Yet, like all machines, they can have their moments. That’s why knowing some basic troubleshooting can save you both time and money.

If you’re looking to deepen your understanding of troubleshooting Goodman furnaces beyond just interpreting error codes, we’ve got just the resource for you. Our comprehensive article covers a wide array of common issues and provides step-by-step guidance on how to address them effectively. Whether you’re facing a minor hiccup or grappling with a more complex problem, this article is packed with valuable insights and practical tips to help you get your Goodman furnace running smoothly again. You can find this informative piece here for an in-depth exploration into troubleshooting your Goodman furnace.

To prevent property damage, personal injury or death due to electrical shock, disconnect electrical power to the furnace before performing any maintenance.

Resetting Goodman Furnace from Lockout

Furnace lockout results when a furnace cannot achieve ignition after three attempts or when it has lost flame five times during a single call for heat. It is characterized by a non-functioning furnace and shown in Goodman furnace error code by 1 LED flashes. If the furnace is in a lockout, it will (or can be) reset in any of the following ways.

  1. Automatic reset. The integrated control module will automatically reset itself and resume normal operations following a one-hour lockout period.
  2. Manual power interruption. Interrupt 115-volt power to the furnace for 0 – 20 seconds.
  3. Manual thermostat cycle. Lower the thermostat, so there is no longer a call for heat for 0 – 20 seconds, then reset to the previous setting.

Continuous LED flashes on Goodman furnace

Furnace must have a 115 VAC power supply properly connected and grounded. Proper polarity must be maintained for correct operation. An interlock switch prevents furnace operation if the blower door is not in place. Keep the blower access door in place except for inspection and maintenance.

From my experience, a systematic approach always helps. Before diving deep into components, always inspect the basics like the thermostat and circuit breakers. And never underestimate the importance of regular maintenance. A routine check can prevent many of these issues from cropping up in the first place.

When to Call Pro

Goodman furnace should be inspected by a qualified HVAC technician at least once per year. This check should be performed at the beginning of the heating season. This will ensure that all furnace components are in proper working order and that the heating system functions appropriately.

By following these Goodman furnace error codes, you’ll be able to identify and fix the most simple issues with your Goodman furnace. However, it’s more practical to contact a professional HVAC technician for certain tricky problems.

In conclusion, understanding the Goodman furnace error codes is an essential skill for any homeowner looking to ensure the longevity and efficiency of their heating system. These codes are designed to help you diagnose issues quickly and accurately, providing clear indications of what might be going wrong. From thermostat connection issues to more complex problems like reversed polarity or pressure switch malfunctions, these codes cover a broad spectrum of potential furnace problems.

While some of these issues can be addressed through simple DIY fixes, such as adjusting the thermostat settings or cleaning filters, others may require the expertise of a professional HVAC technician. It’s important to approach furnace troubleshooting with a balance of knowledge, caution, and practicality. Always prioritize safety, especially when dealing with electrical components or gas-related issues.

Remember, regular maintenance and prompt attention to these error codes can save you time and money in the long run by preventing larger, more costly repairs. You can enjoy a warm, comfortable home without unnecessary disruptions by staying informed and proactive about your Goodman furnace’s health.

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Mas Broto

Have been in the heating and air conditioning (HVAC) industry for over 20 years. He is person that will grow and thrive to learn more about the HVAC industry throughout his career. Mas Broto is also a blogger, who's dedicated to bringing you the best knowledge to get ahead in the game of life.

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