Troubleshooting Circuit Board Problems: Common Aircon Issues

Air conditioners have smart parts called circuit boards. These boards make sure the temperature, fan speed, and timing are just right in your room. But sometimes things go wrong and aircons stop working properly.

This can mean higher electricity bills and rooms that are too hot or too cold.

Circuit boards might break because of big power zaps from outside or inside and wires that don’t work anymore. To keep these smart parts safe, people use special plugs called surge protectors and switches called circuit breakers.

If trouble happens, fixing it could mean checking for damage on the board, making sure electricity flows right, or changing puffy capacitors.

Looking after your aircon with regular check-ups means fewer breakdowns and a longer life for your circuit board. Knowing whether to fix or get a new one depends on how much it will cost you and how badly damaged it is.

Keep reading to find out how to spot problems quickly and keep cool at home!

Understanding the Role of Circuit Boards in Air Conditioning Systems

Circuit boards are the brains of air conditioning systems. They handle the hard work of managing the system’s functions, like controlling temperature and fan speeds. These printed circuit boards (PCBs) also make sure everything times perfectly to keep your room comfortable.

Think of them like an orchestra conductor, making sure each part plays at the right moment.

These PCBs are full of tiny paths called conductive tracks. Electricity travels along these to power various components like resistors and transistors. It’s important for these parts to work well because they help control how much electricity goes where.

If something on the board fails, your aircon might stop cooling your space or run up your energy bill.

Identifying and Addressing Common Aircon Circuit Board Issues

Circuit boards are the nerve centre of air conditioning systems, orchestrating operations from temperature control to fan speeds. When these integral components falter, recognising and rectifying common issues is crucial to restoring your aircon’s functionality and preserving its longevity.

Let’s explore how to diagnose and mend prevalent circuit board dilemmas, ensuring a cool reprieve remains at your fingertips.

External Current Surge

Power spikes from the external power supply can wreak havoc on an aircon’s printed circuit boards. These surges often come from lightning strikes or changes in the power grid. They send high voltages racing through the wires, which can fry delicate electronic parts.

Surge protectors are a must-have to guard against this damage. They work by blocking excess electricity and only letting safe levels reach your appliances.

Circuit breakers also play a big part in keeping equipment safe during a surge. Think of them as gatekeepers that shut off power when it gets too strong. This helps prevent burn marks on your PCBs and saves you from costly repairs or replacements.

It’s smart to check these protective devices regularly to make sure they’re ready for any sudden jumps in power supply.

Internal Current Surge

An internal current surge can wreak havoc on your aircon’s circuit board. Surges like this may cause components within the printed circuit boards to overheat or even burn out. It’s often a run capacitor or voltage regulator failure that sparks an internal surge.

These parts are vital in managing electricity flow and keeping it steady.

Look for signs of scorching or damaged components on the PCB if you suspect an internal surge has occurred. A multimeter can be handy to check for short circuits across the board’s pathways directly linked to these key elements.

Make sure all connections are secure, which helps prevent future surges from damaging the system again. If parts look fried, it’s vital to replace them quickly before they lead to total breakdowns within your unit’s control board.

Failed Wiring

Moving beyond internal current surges, failed wiring in your air conditioner’s circuit boards can spell trouble. Loose wires are like the sneaky culprits behind many control board issues.

They create chaos by disrupting signals and power flow within systems such as fan motors and starting capacitors. During routine maintenance checks, ensure all connections are snug and secure.

This simple step might save you from unexpected breakdowns.

Wires that aren’t configured properly can also lead to big problems. Imagine trying to fit a square peg into a round hole – it just doesn’t work! The same goes for wiring on a printed circuit board (PCB).

Each wire has its place; if not correctly positioned, your HVAC system could malfunction or even stop working altogether. Regular inspections help catch these misconfigurations before they cause any real damage.

Preventive Measures for Circuit Board Issues

Implementing preventive measures for circuit board problems in air conditioners, such as regular maintenance checks and using voltage protection devices, can significantly reduce the likelihood of malfunctions—discover how to safeguard your system against potential future breakdowns.

Proactive Steps for Preventing Future Aircon Breakdowns

Schedule regular servicing for your air conditioner to keep it running smoothly. This helps avoid breakdowns and protects the PCB (printed circuit board). Use surge protectors to guard against power surges that can harm electronic components.

Fit circuit breakers as they are key in shielding aircon units from external current spikes.

Check your aircon’s wiring often and fix any issues right away. Ensure grounding is done properly to prevent electrostatic discharges damaging the motherboard. Consider installing an uninterruptible power supply (UPS) for consistent, clean energy input even during power outages.

These steps extend the life of your system and ensure energy-saving performance.


Keep your air conditioner running smoothly by staying alert to circuit board issues. Remember, a little awareness can prevent big problems with your cooling system. Tackle common troubles like current surges or failed wiring promptly before they grow worse.

Taking steps to protect and maintain the heart of your aircon, the PCB, ensures a comfortable home all year round. Stay cool and confident knowing you’ve got the knowledge to keep those breezes blowing without interruption.

Discover more about how you can safeguard your aircon against future issues by visiting our detailed guide on proactive steps for preventing future aircon breakdowns.


1. What causes a printed circuit board (PCB) in my aircon to fail?

Static charges or electrostatic discharge (ESD) can damage the delicate parts of a PCB, leading to failure. Furthermore, poor solder joints and overheating in power supplies may also cause problems.

2. Why does my Mitsubishi MXY-3A28VA mini split aircon shut off unexpectedly?

Unexpected shutdowns could be due to power failures or interruptions from the electrical distribution network, including issues with power transmission lines or your home’s power source.

3. Can I fix a PCB myself if it’s not working properly?

Fixing printed circuit boards requires knowledge of electronic devices and experience with handling surface-mounted components like relays and fuses. It’s often safer to consult an expert for PCB repair or replacement.

4. How do smart thermostats help prevent circuitry issues in heating and cooling systems?

Smart thermostats manage the demand on your air-conditioner more effectively, which reduces stress on its internal components including uninterrupted power supplies (UPS), thereby helping prevent common circuitry issues.

5. When should I consider replacing instead of repairing the PCB in my air conditioner?

Consider replacing the PCB if you’re facing repeated power failures that affect its function despite repairs, as this might indicate a deeper issue with the core components that are part of your unit’s printed circuit boards system.

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