Why does furnace control board go bad?

Debris and dust can cause the air filters to clog, resulting in the overheating of the blower motor. Dirty or wrong fuse. A wrong fuse that’s too small for your furnace or one that hasn’t been cleaned in a while can also cause the circuit board to break down.

Where is the furnace control board located?

The HVAC control board is where the thermostat wires connect to your heating and cooling system. In most cases the control board can be found at your furnace or air handler.

How do you change a furnace control board?

Control Board Replacement

Ensure that the power to the furnace is off.
Mark all of the wires and write down which connections they go to on the board.
Remove the wires.
Remove the old board (The board may be held in place by screws or plastic clips.
Attach the new board with the screws or snap it in with the plastic clips.

Can a furnace control board be brought back to factory specifications?

But all parts on the furnace control board have a life expectancy, and many things can happen to accelerate the aging process of the parts on that board. Assuming there’s power to the board, it should function properly. If it’s not, there’s nothing we can do to bring it back to factory specifications.

Why does my gas furnace control board keep failing?

When an electro-mechanical switch like the ones on our boards is suddenly being used after a long period of downtime, like the end of one winter to start of the next winter, it can become permanently stuck. Tapping on the relay can sometimes help, but only delays the inevitable failure of the board.

Why do I need to replace my furnace thermostat?

Relays in the control board are stuck in the closed position, so the blower is getting a constant supply of electricity, and the control board must be replaced The thermostat also has contacts that control power to the furnace, and they can be worn, so the thermostat must be replaced.

Why does my furnace keep turning off and on?

A furnace that keeps turning off could indicate a problem with the voltage. However, it could also be a problem with the furnace itself, such as bad controls or a loose wire. When you’re working on troubleshooting a furnace, you will have to perform a variety of tests to figure out the problem.

Where can I find a furnace control board?

The circuit board is usually located in the furnace’s blower chamber near the bottom of the unit. This is where the circulation blower fan motor is mounted. While the procedure to access the board and replace it with a new one will vary depending on the model, here are some general steps you can follow:

What are the symptoms of a bad furnace control board?

Here are signs you may have a malfunctioning furnace control board: Uncomfortable temperatures: If your furnace starts to make you either too hot or too cold, and the thermostat settings seem fine, then the problem might be a control board that is turning components off too soon or letting them run too long.

What is the Control Board in a furnace?

A furnace control board is similar to a computer circuit board. It’s the furnace’s brain. It operates all functions, in the order they are to occur. It controls everything the furnace does each heating cycle. Because they are a sophisticated electronic, they can fail & must be replaced.

What is the furnace control board cost?

If you are a home DIY type of person furnace control boards can be bought online for $50-$250 dollars depending on the furnace . Doing it yourself is very tempting so let’s look at a few things needed to do it. First be sure the board is bad. Aug 20 2019