Addressing Circuit Board Issues: Common Aircon Problems and Solutions

Your air conditioner’s cooling hiccups might just trace back to a little-known hero: the circuit board. Tiny yet powerful, this vital component sits at the heart of your system, orchestrating every chill breeze.

We’ll guide you through common circuit issues and hand you the toolkit for cool relief. Stay with us for some cool fixes!

Understanding the Role of Circuit Boards in Air Conditioning Systems

Circuit boards are the brains of air conditioning systems intricately designed to orchestrate the symphony of cold air we enjoy. In these complex machines, it’s the printed circuit board (PCB) that dictates how effectively a room is cooled by regulating temperatures and managing power supply routes.

These electronic map-like components sport conductive tracks, resistors and transistors, which make real-time decisions for controlling airflow and maintaining desired comfort levels.

When you set your air conditioner using a remote control or an app on your smartphone, you send signals directly to the PCB. This part responds swiftly by adjusting fan speed and chilling intensity settings.

It ensures that crucial parts like the condenser and evaporator coil work harmoniously to provide efficient energy use and optimal cooling performance. Without properly functioning circuitry inside these units, our day-to-day experience could be much less comfortable during hot seasons or in climate-controlled environments.

Identifying Common Aircon Circuit Board Issues

In the intricate workings of air conditioners, circuit boards emerge as critical components; however, they are not immune to failures. It’s essential to pinpoint familiar malfunctions that can lead to more significant system issues if left unattended.

External Current Surge

Power surges can wreak havoc on air conditioning units, often striking without warning. An external current surge occurs when the electrical distribution network experiences a sudden increase in voltage.

This spike can be caused by various factors such as lightning strikes, restored power outages, or faults in the power transmission lines. When this happens, the delicate electronic components within your aircon’s printed circuit board (PCB) may get damaged.

Air conditioners are designed to handle a specific range of voltages, and an abrupt excess can cause parts like capacitors and solder joints to fail. Surge protectors offer one line of defence, but ensuring proper grounding is crucial for absorbing excess electricity safely away from sensitive electronics inside devices like Mitsubishi MXY-3A28VA or other central air conditioning systems.

Immediate troubleshooting with tools like a multimeter is vital following any suspected surge event to assess the damage and prevent further issues with the circuitry.

Internal Current Surge

An internal current surge can wreak havoc on an air conditioning system’s printed circuit boards (PCB). These surges often stem from within the system itself. For instance, a short circuit in the fan motor might send a sudden electricity spike through the PCB components.

This abrupt increase in current can overheat parts or create electrostatic discharges that damage sensitive electronics.

Electronic devices inside your aircon, like voltage regulators and capacitors, are designed to handle specific power levels. If these parts experience currents exceeding their capacity, they may fail prematurely.

Swollen capacitors are telltale signs of such damage; they indicate that components have been subjected to high stress during a surge. Electrical issues like these diminish performance and could lead to power failure if left unaddressed.

Regular maintenance checks help spot early signs of trouble before they escalate into major air conditioning problems requiring complex repairs.

Failed Wiring

Failed wiring in air conditioning systems can lead to numerous issues, including inconsistent cooling and system shut-offs. Cracked or frayed electrical wires interrupt the smooth flow of electricity, which is crucial for maintaining the performance of room air conditioners and central air conditioning units.

Moreover, damaged wires may produce strange noises or odours due to short circuits that affect the motherboard and other delicate electrical components.

Spotting wiring problems often necessitates a careful inspection by a licensed tradesperson. Burnt-out connections and loose wires must be addressed promptly to prevent further damage.

While routine maintenance helps identify potential hazards early on, sudden power failures from external power supply sources can cause unexpected stress on the HVAC system’s circuitry.

This underscores the importance of having robust protective measures such as uninterruptible power supplies (UPS) in place to safeguard against electrical faults that could compromise your aircon’s functionality.

Addressing and Fixing Circuit Board Problems

Tackling aircon circuit board dilemmas involves a methodical approach, often with meticulous troubleshooting to ensure precise repairs or necessary replacements enhance your system’s functionality.

Continue reading to uncover how to restore your air conditioner’s performance and extend its lifespan.

Troubleshooting the Circuit Board

Begin troubleshooting the circuit board by visually inspecting it for signs of damage. Look closely for burnt components, loose connections, or any corrosion that might be present.

If you spot these problems, they could be the culprits behind your aircon’s erratic performance or a complete system shutdown. Dust and debris can interfere with functionality, too, so use a soft brush to clean the board gently.

Move on to check capacitors, which are often involved in circuit board failures; swollen or leaking ones will need replacement. Ensure all wires are securely fastened and not frayed or damaged.

A careful examination may reveal soldering issues requiring reflow soldering to fix loose parts and ensure stable connections. These steps are vital in restoring consistent cooling and preventing frequent shut-offs or odd noises from your air conditioning unit.

Repairing or Replacing Faulty Components

Inspecting your air conditioner’s circuit board can reveal issues like burnt parts or loose wires. These clues help decide whether a repair will fix the problem or if it’s time to replace the entire component.

Repairing usually involves soldering new pieces onto the board, tightening connections, and cleaning off corrosion carefully with the right tools.

If components are beyond repair, installing a new circuit board is necessary to get your aircon up and running again. Technicians match the right type of PCB to ensure compatibility with your system and restore efficient operation.

Taking care of these key parts keeps energy costs down and extends the life of your central air conditioning unit.

Preventive Measures for Circuit Board Issues

To mitigate circuit board malfunctions, regular maintenance and protective strategies are essential for the longevity of your air conditioning system; uncover how these measures can avert costly repairs and promote energy efficiency in our detailed guide.

Implementing Aircon Preventive Measures That Work

Regular maintenance is a key preventive measure for air conditioning systems—schedule routine check-ups to clean filters and ensure the airflow remains unobstructed. Dust and dirt can cause havoc in your system, so use a vacuum cleaner to remove buildup from vents and exchange coils.

Keep an eye on the condensate drain, too; blockages here can lead to moisture issues, which may affect circuit boards.

Inspect your aircon’s refrigerant levels frequently, addressing leaks immediately if detected. Refrigerant imbalance reduces efficiency and increases the strain on compressors and circuits.

Test sensors regularly for accurate operation since faulty readings can lead to unnecessary cycling, stressing internal components like capacitors and circuit breakers. By proactively managing these aspects of your central air conditioner, you help safeguard it against electrical problems and extend its lifespan significantly.


In conclusion, tackling circuit board challenges is crucial for effective air conditioning. Understanding and resolving these common issues ensures your system runs smoothly.

Adopting preventive measures extends the lifespan of your equipment and maintains optimal performance. Stay proactive in maintenance to enjoy a cool, comfortable environment.

Remember, a well-maintained aircon is key to efficient and reliable seasonal cooling.

For more detailed guidance on maintaining your air conditioning system, visit our page on implementing aircon preventive measures that work.


1. What causes electrostatic discharge (ESD) in aircon units?

Static charges can accumulate and lead to ESD, which might damage sensitive components like those on a circuit board in air-conditioners.

2. How does alternating current affect my aircon’s performance?

Aircons run on alternating current (AC), and AC supply issues can cause airflow, dampers, and pump problems, impacting their energy-saving features.

3. Can a starting capacitor issue prevent my central air conditioning from working?

If the starting capacitor is faulty or fails, it may stop your central air conditioning unit from turning on because it powers up the system.

4. Are any solutions for static buildup affecting my computer-controlled air conditioner?

Grounding your systems properly prevents static buildup that could disrupt computer-controlled functions within your energy-saving air-conditioning system.

5. What should I check if my air conditioner suddenly loses power?

Ensure your power source is stable, and check for blown fuses or tripped circuits that could interrupt power to DC-using components within the unit.

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