Bryant Furnace Troubleshooting: What to Do When You See Code 34

You probably know that a Bryant furnace is one of the most trusted brands in home heating. But what you might not know is that Bryant furnaces are also some of the most reliable. In fact, according to a recent study by leading consumer publication HomeBuyer, Bryant ranked #1 on its list of Top 10 Residential Furnace Brands. A major reason why so many trusts and rely on Bryant furnaces is because they have an advanced diagnostic system called Code-Connect that can detect and diagnose potential issues with the furnace. If your furnace displays Code 34 or “F9” error codes, don’t panic! There are things you can do to get your furnace up and running again quickly and efficiently. Keep reading for troubleshooting tips for when you see Code 34 in your Bryant furnace.

What Does Code 34 Mean?

The F9 Code 34 or Code 34 error on your Bryant furnace means that the furnace has detected a problem with its gas valve. You can think of the gas valve as the “engine” of your furnace. It’s what heats your home using gas! While there are many different parts and systems of your furnace, the gas valve is the most critical part. A Code 34 furnace error may mean that the gas valve is broken or faulty. It may also mean that the gas source for the system is off or not functioning properly. In some cases, a Code 34 error may indicate that there is an issue with the wiring of the gas valve.

Check Your Furnace Filters

If you’re seeing a Code 34 error on your furnace, the first thing you should check is the filters. Your furnace has a filter for the exhaust and a filter for the air intake. These filters collect dirt and debris from your home’s air. As they become clogged with filth, they can restrict airflow through the furnace and cause a Code 34 error. If you see a Code 34 error and your furnace isn’t running, check the filters first. If they’re clogged or dirty, you can easily remove them, clean them, and put them back in place. You can find replacement furnace filters at most hardware stores and home improvement stores.

Check Your Gas Valve

If your filters are clean, next you should check the gas valve. Start by turning off the furnace and opening the furnace’s access panel. Then, look for the gas valve. It should be a large metal or plastic box with electrical connectors and a gas connector coming out of it. If you see a Code 34 error and you find the gas valve, turn it off and unplug the electrical connectors. Unscrew the gas connector and check for debris in the connector and in the valve itself. If you find debris inside the gas valve, you can clean it out with a rag and some cleaning solution. If the debris is too loose and easy to clean out, it could indicate a bigger problem. If the debris is too baked on to be easily cleaned off, it’s probably something inside the valve itself. In this case, you should call a professional and have the valve replaced.

Reset the Electronic Control

If your filters are clean and your gas valve is in good condition, your next step is to reset your electronic controller. The electronic control is a computerized device that controls the furnace, and it may be causing your furnace to display the Code 34 error. To reset the electronic control, turn off the furnace and turn off the circuit breaker that powers the furnace. Then, press and hold the “Ignition” button for 10 seconds. After you let go of the button, turn on the circuit breaker and turn the furnace back on. If the furnace displays a different error after resetting the electronic controller, you can check the wiring of the controller. If the wiring is loose or improperly connected, you can re-secure it or have it professionally repaired.

Reset the Electronic Controller

If resetting the electronic controller doesn’t fix your Code 34 error, you may need to have the controller replaced. To do this, turn off the circuit breaker that powers the furnace and remove the access panel. Inside, you should find the controller. It’s a small black box with a bunch of cables coming out of it. Disconnect the cables from the controller and take it to your local hardware store. Get a new controller that’s compatible with your furnace’s make and model. Then, install the new controller and reconnect the cables. When you turn the circuit breaker back on and turn the furnace on, the new controller should display a code and instructions for setting it up.

How to Find the Actual Problem?

If the above steps don’t fix your Code 34 error, your last option is to find the actual problem. Here are a few things you can do to find the source of the problem: – Check Your Gas Source: If your gas source is off or not working properly, your furnace will display a Code 34 error. Check your gas source and make sure it’s on and working properly. If you’re using a gas stove in your home, make sure it’s turned off too. – Check Your Electrical Wiring: If there’s an issue with your electrical wiring, it may be causing a Code 34 error. Make sure your wiring is in good condition and properly connected. – Check Your Furnace Pressure: If everything is in working order except for your furnace pressure, your furnace will display a Code 34 error. Make sure your furnace pressure is set properly. – Check Your Furnace’s Blower: Blower issues can cause a Code 34 error. Make sure your blower motor is in good condition and properly connected.


A Bryant furnace is one of the most reliable heating systems you can have in your home. But when something goes wrong, it can be frustrating and challenging to figure out what needs to be fixed. When you see Code 34 on your furnace, don’t panic! If your furnace isn’t running and you see Code 34 on your display panel, check the filters and the gas valve. If those are in good condition, reset the electronic controller or replace the controller if necessary. Once you’ve fixed your furnace, you can rest easy knowing it’s running efficiently and heating your home safely!