Our control board replacement guide will help you to diagnose and replace (when necessary) your furnace control. There are basically two types of gas furnace control boards. The first type are simple ignition controls which control the gas valve, the ignitor (either a spark generator or hot surface ignitor), and a flame sensing circuit. These controls are more common on older less efficient units. The other type is usually referred to as an integrated furnace control. These controls perform the same functions as the ignition control but also control the furnace blower in both the air conditioning and heating modes as well as providing onboard diagnostics.**NOTE** ONLY YOU CAN ASSESS YOUR ABILITY TO PERFORM THIS TASK. THIS GUIDE CANNOT COVER EVERY POSSIBLE SITUATION.The integrated furnace control is the heart of the furnace. Most of them have the same basic sequence of operations that they control. It is critical to know what the control is supposed to do so that you can tell that it is operating properly.

On a call for heat, they first start the induced draft motor (if the furnace has one). Then, the inducer causes a pressure switch to close. The control then either ignites the pilot, starts the direct spark ignitor, or starts the warmup of the hot surface ignitor.After the pilot is lit and verified or the hot surface ignitor is warmed up (glowing bright yellow), the gas valve is energized. At the same time a timer begins to ensure that the burners were lit. In most cases a separate flame sensor proves that the burners are lit.After the burners are lit, a timer starts and energizes the furnace blower after the set delay. When the thermostat is satisfied, the control shuts off the gas. The inducer usually runs for about 30 seconds to purge the heat exchanger. A timer shuts the furnace fan off after a delay. This time delay is usually adjustable on the control board. If the control does not cause the individual components to perform as described above, the control may be bad.

Observe the operation and when the normal thing does not happen, you should check the operation of the related components. Most of the controls have built in diagnostic indicators. These are normally led lights that operate in flashes to indicate the problem. There should be a chart on the control or on the furnace access panel that explains the flashing codes. For many of the controls, there is a green light to let you know that the power is on and the control is functioning. If this light is not on, the control is usually reset by shutting the furnace power off for about 30 seconds and then turning it back on.**HOT TIP** IF YOU HAVE TO RESET THE CONTROL, PERFORM MORE TROUBLESHOOTING TO FIND THE CAUSE. IT IS NOT NORMAL TO HAVE TO RESET THE CONTROL. Once you have identified a defective control board, you continue your control board replacement by finding the proper replacement. This can be achieved by finding the manufacturer's part number or by using the furnace model and serial number.

There are also universal controls that can be used for many furnaces. You can purchase your replacement part through our parts store.To begin the control board replacement, you should ensure that the power to the furnace is off. Then, you should mark all of the wires and write down which connections they go to on the board.ac unit in the sunThen, you can remove the wires. small ac unit for roomThe board may be held in place by screws or plastic clips. pricing for ac units for homesRemove the screws or clips and remove the old board.Now, you can attach the new board with the screws or snap it in with the plastic clips. Carefully reconnect the wires you removed. You should complete your control board replacement, by restoring the power to the furnace. Run the system through a heating cycle and verify proper operation.

Choose your product type Common number model plates Common model number plates View sample model numbers by selecting your product brand How to Replace an Electronic Control Board in a Window Air Conditioner This step-by-step repair guide shows how to replace the electronic control board in a window air conditioner. The control board is the “brains” of the window air conditioner. It monitors sensor and activates components as needed to cool the room and maintain the set temperature. If the electronic control board is defective, replace it using a manufacturer-approved replacement part. Less than 45 min. For manuals, repair guides, and specific part recommendations, enter your model number. Help me find my model number Wear work gloves to protect your hands. Warning: Undertaking repairs to appliances can be hazardous. Use the proper tools and safety equipment noted in the guide and follow all instructions. Do not proceed until you are confident that you understand all of the steps and are capable of completing the repair.

Some repairs should only be performed by a qualified technician. Unplug the power cord from the wall outlet. Remove the screws that hold the accordion filler panels in the window frame. Push the accordion filler panels inward to clear the window frame. With someone’s help, support the air conditioner and raise the window sash. Carefully lift the air conditioner out of the window and set it on a stable work surface. Grasp the sides of the front grill panel at the top and pull the front grill panel out and off of the air conditioner. Pull out the filter. Tip: Take this opportunity to clean the air filter if necessary. Remove the screws from the sides and bottom of the control panel. Pull the control panel up and hold it above the air conditioner while you unplug the wire harness connection for the user interface control board. Set the control panel aside. Remove the screws from the sides of the front panel. Pull the front panel off of the air conditioner and set it aside.

Remove the screws from the exterior of the outer case. Remove the center stop for the accordion filler panels. Remove the hidden screw that’s under the center stop. Pull outward on the bottom of the outer case and remove the outer case from the air conditioner. Remove the screws from the electronic control board case. Pull the cover of the electronic control board case out to expose the electronic control board. Take a digital photograph or otherwise document the location and routing of wires connected to the electronic control board so you can connect the new one correctly. Pull all wires off of the electronic control board. Remove the mounting screws that hold the electronic control board in the case and pull out the electronic control board. Position the electronic control board in the case and reinstall the mounting screws. Using your photograph or other documentation as a guide, connect all the wires to the new electronic control board.

Make sure that wires are properly routed so that they’re not pinched or damaged during reassembly. Position the cover of the electronic control board case and reinstall the screws. Tip: Make sure that wires aren’t pinched when reinstalling the electronic control board cover. Position the outer case on the air conditioner and reinstall the screws, including the hidden screw in the center. Position the front panel on the air conditioner and reinstall the mounting screws on the sides of the front panel. Position the control panel above the air conditioner and plug the user interface control wire harness back in. Position the control panel on the front of the air conditioner and reinstall the mounting screws in the control panel. Insert the filter on the front of the air conditioner. Position the front grill panel on the front of the air conditioner and snap the front grill panel into place. Plug the air conditioner into the electrical outlet.

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