Bryant Furnace Codes 31 – What They Mean and How to Fix Them

Diagnostic codes on your Bryant furnace indicate there is a problem with one of its sensors or safety features. There are several different error codes and descriptions, but they all mean the same thing: Your furnace will not run until you correct the problem. Depending on the specific error code, there may be simple steps you can take to get your furnace back up and running. If you have a new or replacement furnace, the installation company has likely left diagnostic codes as the default setting. If your previous installer did not leave them enabled, you’ll need to locate the dials and set them to ON by twisting them counterclockwise. The location of your diagnostic codes varies among furnaces, so be sure to check your user manual if you are unable to locate them.

Error Code 31 – Freeze Protection Fault

The freeze protection fault occurs when the furnace fails to start because the system’s thermostat detects the temperature inside the house is below the freeze threshold. To correct the problem, you’ll want to check the thermostat. The thermostat may be set too low or it may be malfunctioning. If the thermostat is set at the correct temperature, there may be a problem with the wiring or the thermostat may be broken. If you have a multi-stage thermostat, you also need to make sure the system is not in cooldown mode. If this is the case, the system will not attempt to restart until it has returned to the desired temperature.

Error Code 32 – Temperature Sensor Error

This error occurs when the system detects a problem with the temperature sensor. To correct the problem, you’ll need to inspect the temperature sensor and ensure it is not broken. You may need to replace the sensor if it is damaged. The sensor is attached to the furnace by a wire. If the sensor is loose, it may cause an error. If nothing appears to be wrong with the sensor, you may have a wiring problem. If you get this error on a new furnace, the sensor has likely been installed incorrectly. You can fix this problem by following the sensor installation instructions in the installation manual.

Error Code 33 – Overheat Protection Fault

This error occurs when the system detects an overheating condition. If you see this error, immediately turn off the furnace. You must shut off the furnace before the motor overheats and burns out. You must also correct the problem that caused the error because the system will not restart until the problem is fixed. To correct this error, you’ll want to inspect the blower system for obstructions. If the blower is obstructed, the system will shut down and trigger the error. Look for things such as pieces of duct tape, lint, or a piece of clothing that may have fallen into the blower.

Error Code 34 – High Oxygen Sensor Error

The high oxygen sensor error occurs when the furnace detects a problem with the high oxygen sensor. To correct the problem, you’ll need to inspect the sensor and ensure it is installed correctly. The sensor must be installed within 2 inches of the combustion chamber. If the sensor is not installed correctly, you’ll need to remove the furnace panel and realign the sensor. You may need to replace the sensor if it is broken.

Error Code 35 – Exhaust Sensor Error

The exhaust sensor error occurs when the furnace detects a problem with the sensor. To correct the problem, you’ll need to inspect the sensor and ensure it is installed correctly. The sensor must be installed within 2 inches of the furnace exhaust port. If the sensor is not installed correctly, you’ll need to remove the furnace panel and realign the sensor. You may need to replace the sensor if it is broken.

Error Code 36 – Burner Orifice Restriction Error

The burner orifice restriction error occurs when the furnace detects a problem with the orifice. The orifice is the opening through which combustion air and fuel enter the burner. To correct the problem, you’ll need to inspect the orifice for blockages, replace the orifice if it is clogged or broken, or replace the gas valve.

Codes 41, 42, and 43 – Combustion Problems

These codes indicate that there is a problem with the combustion process. If your furnace displays one of these error codes, you need to shut down the furnace and contact an HVAC technician. You should never attempt to repair a furnace with combustion problems unless you are a trained professional.

Codes 44 and 45 – Blower Problems

These codes indicate that the blower is not working properly. If one of these codes appears on your furnace, immediately shut off the furnace and call an HVAC technician. You should never attempt to repair an electrical problem on a furnace because it poses a serious risk of electrical shock.

Codes 46 and 47 – Startup Problems

These codes indicate that your furnace may not be able to start up. If your furnace displays one of these codes, you’ll need to shut down the furnace and call an HVAC technician. You should never attempt to repair a furnace that will not startup.

Conclusion

A Bryant furnace is a complex piece of equipment, and errors can occur for a variety of reasons. The codes described in this article are some of the most common error codes found on a Bryant furnace, and they are explained with helpful images and information on how to fix them. If you see any of these error codes on your furnace display, be sure to shut down the furnace as soon as possible to prevent any damage or injury. Then, refer to the error code chart to determine what the problem is and how you can correct it. With a little bit of troubleshooting, you should be up and running in no time.