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PCB/PCBA knowledge
Understanding AC PCB – A New Trend in Electronics

The technology continues to progress and as the demand for smarter and more efficient electronic devices increases, Printed Circuit Boards (PCBs) have become an essential component. They play a critical role in a diverse array of electronic devices, including air conditioners (ACs).

AC PCB has emerged as a prominent trend in the electronics industry, transforming the capabilities and efficiency of air conditioners. This article delves into the intriguing domain of AC PCB, providing valuable insights into their functionality, design, troubleshooting, and repair procedures. Immerse yourself in the captivating world of AC PCB and enhance your understanding of these technological wonders.

Table of Contents

What is PCB in an AC?

A Printed Circuit Board (PCB) is a flat board made of non-conductive materials, usually fiberglass or composite epoxy. It acts as a foundation for installing as well as interconnecting electronic components, ensuring their effective operation. With its composition and design, a PCB plays a crucial role in facilitating the proper functionality of electronic devices.


Within an air conditioner, the AC PCB functions as the central nervous system, meticulously controlling and coordinating a multitude of unit operations. It serves as a versatile platform that seamlessly integrates diverse electronic components, including microcontrollers, capacitors, resistors, and transistors, into a unified entity.

Air Conditioner PCB Tutorial with functioning

How Does AC PCB Work?

An AC (Air Conditioning) PCB (Printed Circuit Board) is a fundamental component in air conditioning systems that functions as the central control unit. It receives input signals from the thermostat or user interface, conveying temperature and mode settings. The PCB processes this information using embedded microprocessors and electronic components to activate or deactivate specific components within the AC system.

It regulates the compressor, blower motor, fan, and various valves to control refrigerant flow and air distribution. The PCB integrates sensors that continuously monitor temperature, pressure, as well as humidity levels, providing real-time feedback for precise climate control. Safety features & error detection mechanisms are also incorporated to identify malfunctions and protect the system.

What is the Function of AC PCB?

The AC PCB plays a crucial role in ensuring the seamless operation of the air conditioner, performing a variety of essential functions. These functions are pivotal to the proper functioning and efficiency of the AC unit. Some of the performing key functions of AC PCB include:

a. Temperature Regulation: The PCB receives temperature data from sensors located in different parts of the AC unit. Based on this data, the microcontroller determines whether the cooling or heating mode should be activated and adjusts the compressor speed and fan settings accordingly.

b. Mode Selection: The PCB allows users to select various operating modes, like cooling, heating, dehumidification, and fan-only mode. The microcontroller interprets the user’s input and configures the AC system to operate in the desired mode.

c. Timer and Scheduling: Many modern air conditioners come with timer and scheduling features. The PCB enables users to set timers to turn the AC on or off at specific times, helping to save energy and optimize comfort.

d. Communication: In smart air conditioners, the PCB may have communication capabilities like Wi-Fi or Bluetooth, enabling users to control the AC remotely using mobile apps or voice assistants.

How to Design AC PCB?

Creating a PCB (Printed Circuit Board) for an air conditioning system requires a methodical approach to guarantee optimal performance and efficiency. The process commences by analyzing precise requirements such as cooling capacity, energy efficiency, and user interface functionality.

How to Design AC PCB
How to Design AC PCB

Suitable electronic components, microprocessors, sensors, and devices are carefully chosen based on these requirements. A schematic diagram illustrates the connections between components, adhering to safety and regulatory standards. The physical layout is designed, considering heat dissipation, signal integrity, and component placement. Traces are meticulously routed to minimize signal noise and facilitate efficient power distribution.

Simulation and testing validate the design’s performance, and a prototype is fabricated for real-world evaluation. Iterative adjustments are made, and once the design is finalized, the PCB is prepared for mass production, adhering to industry standards.

How Do I Know if My AC Circuit Board is Bad?

When an AC PCB malfunctions, it can lead to various issues with the air conditioner’s performance. Here are some common signs that may indicate a faulty AC circuit board:

a. No Power: If the air conditioner fails to turn on properly, it could be due to a malfunctioning power supply circuit in PCB or a defective microcontroller.

b. Incorrect Temperature Control: If the air conditioner is unable to achieve the desired temperature or does not respond to changes in temperature settings, it may suggest a malfunction in either the temperature sensor or microcontroller.

c. Erratic Behavior: Unusual behavior, such as the air conditioner turning on and off randomly or the fan speed fluctuating unexpectedly, might indicate a malfunctioning PCB.

d. Overheating: A PCB can lead to the air conditioner generating excessive heat, which can cause system shutdowns as well as reduce cooling efficiency.

What Happens When AC PCB is not Working?

When the AC (Air Conditioning) PCB (Printed Circuit Board) is not working, several significant issues can arise within the air conditioning system. As the central control unit, the malfunctioning PCB fails to receive and interpret input signals from the thermostat or user interface, leading to an inability to regulate temperature settings and operational modes.

This can result in erratic cooling or heating, or even a complete failure to produce conditioned air. Moreover, without functioning sensors and error detection mechanisms, the PCB cannot monitor critical parameters, making the system susceptible to overheating, freezing, or other safety hazards.

The AC unit may continuously run or not turn on at all, leading to energy wastage or discomfort for occupants.

What is the Cause of AC PCB Failure?

AC (Air Conditioning) and PCB (Printed Circuit Board) failures can be attributed to various factors. One common cause is electrical issues, such as power surges, voltage fluctuations, or short circuits, which can damage the sensitive electronic components on the PCB. Excessive heat can also lead to failure, especially if the PCB’s design lacks proper heat dissipation measures. Environmental factors, such as moisture or humidity, may corrode the PCB and its connections over time.

Poor manufacturing quality or improper handling during installation can contribute to PCB failures. Age and wear are also significant factors; as the PCB ages, components may degrade or develop soldering issues, leading to malfunction. Inadequate maintenance and lack of regular cleaning may exacerbate these problems.

How to Repair AC PCB?

Repairing an AC (Air Conditioning) PCB (Printed Circuit Board) requires skill and attention to detail due to its delicate electronic components. The initial step involves removing the faulty PCB from the AC unit. A thorough visual inspection is conducted to identify any visible damage, such as burnt components or loose connections.

How to Repair AC PCB
How to Repair AC PCB

Damaged components are replaced with suitable replacements, and proper soldering techniques are employed to secure them onto the PCB. Care is taken to avoid excessive heat during soldering to prevent further damage. After repairs, the PCB undergoes testing to ensure all functionalities are working correctly.

Once the repair process is successful, the PCB is reinstalled in the AC unit, and a final system test is performed to verify proper functioning.


AC PCB has emerged as a revolutionary trend in the electronics industry, significantly improving the functionality and efficiency of air conditioners. Serving as the brain of the unit, these circuit boards regulate temperature, control various modes, and facilitate communication with users.

However, like all electronic components, AC PCB is susceptible to failure due to various factors such as electrical surges, environmental conditions, and wear. Understanding the functions and design of AC PCB can help users recognize potential issues and seek timely professional assistance for repairs.


Within an air conditioner, the AC PCB functions as the central nervous system, meticulously controlling and coordinating a multitude of unit operations. It serves as a versatile platform that seamlessly integrates diverse electronic components, including microcontrollers, capacitors, resistors, and transistors, into a unified entity.

a. Temperature Regulation

b. Mode Selection

c. Timer and Scheduling

d. Communication

a. No Power

b. Incorrect Temperature Control

c. Erratic Behavior

d. Overheating

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