How to Bypass a Window AC Control Board

How to Bypass a Window AC Control Board

Window air conditioners are a convenient and cost-effective way to cool a room. However, if the control board of your window AC unit malfunctions, it can be frustrating and expensive to replace. In such cases, bypassing the control board can be a temporary solution to keep your AC running. Here, we will guide you through the steps to bypass a window AC control board and provide answers to some frequently asked questions.

1. Safety First: Before attempting to bypass the control board, ensure that the unit is unplugged from the power source. Dealing with electrical components can be hazardous, so take necessary precautions such as wearing gloves and avoiding contact with live wires.

2. Locate the Control Board: The control board is usually housed inside the AC unit’s front panel. To access it, remove the screws or clips securing the panel and carefully detach it.

3. Identify the Components: Look for the main power supply and the wires leading to the compressor. The power supply wires are typically colored black and white, while the compressor wires are commonly red and blue.

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4. Disconnect the Control Board Wires: Using a wire cutter or stripper, carefully cut or strip the wires connecting the control board to the power supply and compressor. Ensure that you leave enough wire length to work with.

5. Connect the Power Supply Wires: Twist the black and white wires from the power supply together and secure them with a wire nut. This will bypass the control board and directly supply power to the unit.

6. Connect the Compressor Wires: Similarly, twist the red and blue wires from the compressor together and secure them with a wire nut. This will bypass the control board and directly activate the compressor.

7. Test and Reassemble: Plug in the AC unit and turn it on. The fan and compressor should start running. If everything works properly, reassemble the front panel and secure it with screws or clips.


Q1. Is it safe to bypass the control board of a window AC unit?
A1. Bypassing the control board is a temporary solution, and it is important to understand the risks involved. If you are not confident in your electrical skills, it is advisable to consult a professional.

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Q2. Will bypassing the control board affect the AC’s performance?
A2. Bypassing the control board may limit some functionalities, such as temperature control and fan speed adjustment. However, the AC should still cool the room effectively.

Q3. Can I bypass the control board of any window AC model?
A3. The process of bypassing the control board may vary depending on the model and brand of the AC unit. Consult the manufacturer’s manual or seek professional advice if you are unsure.

Q4. How long can I rely on the bypassed control board?
A4. Bypassing the control board is intended as a temporary solution until a replacement can be installed. It is not recommended for long-term use.

Q5. Can I use a universal control board as a replacement?
A5. Universal control boards are available, but compatibility with your specific AC unit should be verified before purchasing. Consult a professional or the manufacturer for guidance.

Q6. Will bypassing the control board void the AC unit’s warranty?
A6. Modifying or bypassing the control board may void the manufacturer’s warranty. Check the warranty terms before attempting any modifications.

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Q7. What if bypassing the control board does not fix the issue?
A7. If bypassing the control board does not resolve the problem, there may be other underlying issues. It is recommended to seek professional assistance for further troubleshooting.

Remember, bypassing the control board is not a permanent solution and should only be done if you are confident in your electrical skills. It is always best to consult a professional or consider replacing the control board if the issue persists.

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