Carrier Furnace Code 12 [Meaning, Causes, and Solutions]

Carrier furnaces are known for their efficiency and reliability, but like any other appliance, they can sometimes experience issues. One common problem that can arise is a code 12 error. This error code indicates that the furnace’s blower is running, but the furnace is not producing heat.

In this article, we will explore six possible causes of a code 12 error and how to troubleshoot and fix this issue.

What is Carrier Furnace Code 12?

Code 12 indicates that the thermostat is calling for heat, and the furnace is running the blower in response. If the blower is running but the furnace is not producing heat, there may be a problem with the furnace itself.

It is possible that the furnace’s limit control or circuit board may need to be replaced. It is also possible that there may be an issue with the inlet side of the evaporator coil. I would recommend consulting a licensed HVAC technician to diagnose the problem and recommend a solution.

Causes of Carrier Furnace Code 12

Carrier furnaces are known for their efficiency and reliability, but like any other appliance, they can sometimes experience issues.

One common problem that can arise is a code 12 error. This error code indicates that the furnace’s blower is running, but the furnace is not producing heat. In this article, we will explore six possible causes of a code 12 error and how to troubleshoot and fix this issue.

Malfunctioning Circuit Board

The circuit board is responsible for controlling the various components of the furnace, including the blower and the gas valve. If the circuit board is not functioning properly, it may prevent the furnace from igniting and producing heat. In this case, the circuit board may need to be replaced in order to fix the problem.

Faulty Limit Control

The limit control is a safety device that prevents the furnace from overheating. If the limit control is not functioning properly, it may cause the furnace to shut down before it has a chance to produce heat. In this case, the limit control may need to be replaced in order to fix the problem.

Clogged or Dirty Air Filter

The air filter is responsible for removing dust, dirt, and other contaminants from the air before it enters the furnace. If the air filter is clogged or dirty, it can restrict the flow of air and prevent the furnace from igniting and producing heat. In this case, the air filter should be cleaned or replaced in order to fix the problem.

Obstructed Vents or Ducts

If the vents or ducts that carry air to and from the furnace are obstructed, it can prevent the furnace from operating properly. This can be caused by debris, furniture, or other objects blocking the vents. In this case, the obstruction should be removed in order to fix the problem.

Malfunctioning Thermostat

The thermostat is responsible for sending a signal to the furnace when heat is needed. If the thermostat is not functioning properly, it may not send the proper signal to the furnace, causing it to shut down before it has a chance to produce heat. In this case, the thermostat may need to be replaced in order to fix the problem.

Low Gas Pressure

In order for the furnace to ignite and produce heat, it must have a sufficient supply of gas. If the gas pressure is too low, it may prevent the furnace from igniting. In this case, the gas pressure should be checked and adjusted as needed in order to fix the problem.

Possible Solution

If you are experiencing a code 12 error on your Carrier furnace, the first step is to check the air filter and make sure it is clean and free of debris. If the air filter is dirty, clean or replace it and see if the error persists.

If the error continues, you may need to check the limit control and the circuit board to see if they are functioning properly. If either of these components is faulty, they may need to be replaced in order to fix the problem.

A Carrier furnace code 12 error is caused by a malfunction with the furnace’s blower, gas valve, limit control, or circuit board. The problem can often be fixed by cleaning or replacing the air filter, but in some cases, more extensive repairs may be needed.

If you are unable to diagnose and fix the problem yourself, it is recommended that you contact a licensed HVAC technician for assistance.

How to Fix the Carrier Furnace Code 12?

Step by step guide to fix a Carrier furnace code 12 error, follow these steps:

1. Gather the necessary tools and materials. You will need a screwdriver, pliers, and a new air filter if necessary.
2. Locate the air filter and remove it from the furnace.
3. Inspect the air filter and see if it is clogged or dirty. If it is, clean or replace it with a new one.
4. Turn off the power to the furnace and wait for it to cool down.
5. Locate the limit control and check to see if it is functioning properly. If it is not, it may need to be replaced.
6. Locate the circuit board and check to see if it is functioning properly. If it is not, it may need to be replaced.
7. Turn the power back on to the furnace and see if the code 12 error persists.
8. If the error persists, check the thermostat and gas pressure to see if they are functioning properly. If not, they may need to be replaced.
9. If the problem persists after checking and potentially replacing the air filter, limit control, circuit board, thermostat, and gas pressure, it may be necessary to contact a licensed HVAC technician for further assistance.

By following these steps, you should be able to troubleshoot and fix a Carrier furnace code 12 error. It is important to follow these steps carefully and to replace any faulty components as needed in order to fix the problem and restore your furnace to proper functioning.

Tips and Best Practices for Maintaining Your Carrier Furnace

Tips for Maintaining Your Carrier Furnace and Preventing Code 12 Errors

Code 12 errors on Carrier furnaces can be frustrating and inconvenient, but with proper maintenance and care, you can help prevent these issues from occurring. Here are some tips and best practices for maintaining your Carrier furnace and preventing code 12 errors:

Change the Air Filter Regularly

One of the most important things you can do to maintain your Carrier furnace and prevent code 12 errors is to change the air filter regularly. The air filter is responsible for removing dust, dirt, and other contaminants from the air before it enters the furnace.

If the air filter is clogged or dirty, it can restrict the flow of air and prevent the furnace from igniting and producing heat. To prevent this from happening, it is important to change the air filter every 1-3 months, depending on the type of filter and the usage of the furnace.

Keep the Furnace Clean and Free of Debris

Another important tip for maintaining your Carrier furnace and preventing code 12 errors is to keep the furnace clean and free of debris. Over time, dust, dirt, and other debris can accumulate on the furnace and its components, which can interfere with its operation and cause problems.

To prevent this from happening, it is important to clean the furnace regularly, using a soft cloth or vacuum with a soft brush attachment.

Check the Thermostat and Gas Pressure Regularly

In order for the furnace to operate properly, it must have a functioning thermostat and a sufficient supply of gas. To prevent code 12 errors and other problems, it is important to check the thermostat and gas pressure regularly.

If the thermostat is not functioning properly, it may not send the proper signal to the furnace, causing it to shut down before it has a chance to produce heat.

If the gas pressure is too low, it may prevent the furnace from igniting. To prevent these issues, it is important to check the thermostat and gas pressure regularly and make any necessary adjustments.

Contact a Licensed Hvac Technician for Assistance

If you are unable to diagnose and fix a code 12 error on your own, it is recommended that you contact a licensed HVAC technician for assistance.

A licensed technician will have the knowledge and expertise to diagnose the problem and recommend a solution, ensuring that your furnace is operating properly and efficiently.

By following these tips and best practices, you can help maintain your Carrier furnace and prevent code 12 errors. By taking care of your furnace, you can ensure that it operates efficiently and effectively, providing your home with reliable and comfortable heat.

Why Does My Carrier Furnace Keep Shutting Off?

There are several possible reasons why your Carrier furnace may be shutting off, including:

Dirty Air Filter

If the air filter is clogged or dirty, it can restrict the flow of air and prevent the furnace from operating properly. This can cause the furnace to shut off before it has a chance to produce heat. To fix this problem, the air filter should be cleaned or replaced.

Faulty Limit Control

The limit control is a safety device that prevents the furnace from overheating. If the limit control is not functioning properly, it may cause the furnace to shut down before it has a chance to produce heat. In this case, the limit control may need to be replaced in order to fix the problem.

Obstructed Vents or Ducts

If the vents or ducts that carry air to and from the furnace are obstructed, it can prevent the furnace from operating properly. This can be caused by debris, furniture, or other objects blocking the vents. In this case, the obstruction should be removed in order to fix the problem.

Malfunctioning Thermostat

The thermostat is responsible for sending a signal to the furnace when heat is needed. If the thermostat is not functioning properly, it may not send the proper signal to the furnace, causing it to shut down before it has a chance to produce heat.

In this case, the thermostat may need to be replaced in order to fix the problem.

Low Gas Pressure

In order for the furnace to ignite and produce heat, it must have a sufficient supply of gas. If the gas pressure is too low, it may prevent the furnace from igniting. In this case, the gas pressure should be checked and adjusted as needed in order to fix the problem.

To fix a Carrier furnace that keeps shutting off, you will need to diagnose the problem and determine the cause. Start by checking the air filter and making sure it is clean and free of debris. If the air filter is dirty, clean or replace it and see if the problem persists.

If the problem continues, you may need to check the limit control, vents or ducts, thermostat, and gas pressure to see if they are functioning properly. If any of these components

Conclusion

Carrier furnace code 12 error can be frustrating and inconvenient, but with the right knowledge and tools, it is possible to diagnose and fix the problem. It is somewhat related to error codes 13 and 33.

By understanding the potential causes of a code 12 error, such as a malfunctioning circuit board, faulty limit control, clogged air filter, obstructed vents or ducts, malfunctioning thermostat, and low gas pressure, you can troubleshoot and fix the problem yourself, or contact a licensed HVAC technician for assistance.

By following the tips and best practices for maintaining your Carrier furnace and preventing code 12 errors, you can ensure that your furnace operates efficiently and effectively, providing your home with reliable and comfortable heat.