Goodman Furnace Error Codes: What Do They Mean?

If you’ve ever owned a Goodman furnace, then you know that these units have their kind of weird logic. For example, instead of using standard diagnostic codes like all other manufacturers, Goodman uses error codes. While this may seem like an insignificant detail, it makes troubleshooting a Goodman furnace much more challenging if you don’t know what to look for. If your Goodman furnace is giving you trouble and not lighting up or turning on, it could be for any number of reasons. You might have tripped the circuit breaker or a surge protector, or there could be something wrong with your thermostat. Even if nothing appears to be visibly wrong with your thermostat, it might still be malfunctioning in some way. However, the first thing to check when diagnosing any problem with your furnace is the error codes. These little guys are what let you know exactly what’s going on inside your unit so that you can figure out how to fix it as fast as possible.

What Is an Error Code?

An error code is a number that tells you exactly what’s going on with your equipment. By reading it, you’ll know if you need to replace a component or whether the problem is something you can easily repair yourself. Goodman furnaces use a 2-digit error code that is usually found either on the front or back of the unit. The first digit indicates the type of problem that is occurring, while the second digit gives you more information about the particular issue. For example, an error code of 12 tells you that there’s a problem with the ignition. This could mean that there’s a blockage in the pilot, the gas valve is stuck, or the thermocouple needs to be replaced.

How to Find Goodman Furnace Error Codes

If there’s an error code on your furnace, then it’s pretty easy to find. All you have to do is look for the two numbers next to one another on the front or back of your unit. If you can’t find the error code, then the first thing you should do is check the thermostat. If the furnace is not running because the thermostat is off, then the error code will be blank. In this case, you’ll have to use the thermostat itself to figure out what the problem is. If the error code is present, then you’ll want to start by unplugging the furnace. This will prevent you from accidentally tripping the circuit breaker or, worse, causing a fire.

Error Code 12 and 24: Furnace Won’t Turn On

If your Goodman furnace won’t turn on, then the first thing you should look at is error code 12. This means that there is a problem with the ignition, which could be caused by a bad thermostat, bad gas valve, or a dirty pilot. If the thermostat is bad, then you’ll want to check the fuse. If it’s blown, then you’ll need to replace it with a new one. If it’s not blown and your thermostat is electric, then you may simply need to reprogram it and try again. If the problem is the gas valve, then you’ll want to make sure that it’s clean and that there is gas coming into the furnace. If not, then you’ll want to check the shutoff and make sure that it’s closed.

Error Code 44: Furnace Turns on But Doesn’t Light

If your furnace turns on but doesn’t light, then you’re probably dealing with error code 44. This means that there is an issue with the ignition circuit, which could be caused by a bad spark module, wiring, or a dirty or broken pilot. If the spark module is burned out, then you’ll want to replace it. If the problem is the wiring, then you’ll want to check the voltage and make sure that 120 volts are coming into the furnace. If the pilot won’t stay lit, then you’ll want to make sure that it’s clean and that the thermocouple is not broken.

Error Code 33 and 44: Furnace Lights But Doesn’t Heat

If your furnace turns on and lights but doesn’t heat the evaporator coil as it should, then you’re dealing with error codes 33 and 44. This means that the blower circuit has an issue, which can be caused by a bad relay or dirty blower. If the relay is bad, then you’ll want to replace it. If not, then you may simply need to clean the blower and make sure that it’s not clogged with dirt.

Error Codes 21, 51, and 58: Condenser Malfunction

If your Goodman furnace is not cooling the condenser coil properly, then the issue maybe with the error codes 21, 51, or 58. This means that the control circuit has an issue, which could be caused by a bad pressure switch, a dirty or broken sensor, or a bad evaporator fan motor. If the pressure switch is bad, then you’ll want to replace it. If not, then you may simply need to clean the sensor and make sure that the fan is free of debris.

Finding A Goodman Installer Near You

If you’re having trouble with your furnace and aren’t sure what the issue is, then the best thing to do is call a professional. They will be able to diagnose the problem and tell you what needs to be done to fix it. If you’ve done all the troubleshooting yourself and are still having issues, then you’ll want to find a reputable Goodman installer near you. While Goodman is a reputable manufacturer, mistakes happen and things break. The best thing you can do is find a company that has experience dealing with these units so that you don’t have to worry about whether or not they’re going to get the job done.