Common split system issues and how to solve them

Split system air conditioners are a popular choice for Sydney homes, offering efficient heating and cooling.

But what happens when they don’t perform as expected?

From weak airflow to strange noises, these issues can turn comfort into frustration. The good news is that most problems have simple solutions.

In this blog, we uncover common split system issues and share tips to get your system back in top shape. No one has time for a sweltering Sydney summer without reliable cooling!

1. Reduced airflow or weak heating/cooling

Why is your split system struggling to heat or cool properly?

One of the most common complaints with inverter split systems is reduced airflow or insufficient heating or cooling.

This issue can stem from several causes, such as clogged air filters, obstructed vents, or refrigerant leaks. Proper installation can also play a role in ensuring smooth airflow.

When airflow is restricted or the system isn’t operating efficiently, it has to work harder. This leads to higher energy bills and less comfort.

How to fix airflow and performance issues

1. Check and clean air filters: Dirty filters are the primary culprit. Regularly cleaning or replacing them (ideally every 2–3 months) ensures unobstructed airflow.
2. Inspect vents and outdoor units: Make sure vents are clear of furniture or obstructions. Remove debris (like leaves or dirt) from the outdoor unit.
3. Call a professional for refrigerant leaks: If you suspect the refrigerant levels are low, professional servicing is needed to identify and fix the leak before recharging the system.

2. Unusual noises from the outdoor unit

What’s causing strange noises in your split system?

If your split system is making odd noises, like banging, buzzing, or whistling, it’s more than just annoying.

It’s a sign that something isn’t right!

Common causes include loose parts, debris in the outdoor unit, worn-out fan belts, or refrigerant issues. Ignoring these sounds could lead to more serious damage, so it’s crucial to address them promptly.

When to act and what you can do

1. Tighten loose screws and panels: Sometimes, a quick inspection can reveal loose components that need securing. However, avoid tinkering too much, as this could void warranties or worsen the problem.
2. Clear the outdoor unit: Remove any visible debris, but if something is stuck internally, it’s best not to force it.
3. Call in a professional: Persistent or complex noises often point to internal issues like motor problems or refrigerant leaks. A trained technician can safely diagnose and fix these without causing further damage.

3. Water leakage from the indoor unit

Why is your split system leaking water?

Water dripping from the indoor unit is common, especially if your installation hasn’t accounted for proper drainage.

This usually happens due to a clogged condensate drain, a damaged drain pan, or excessive dirt on the evaporator coils. In some cases, improper split system installation can also cause leaks, making the issue persist over time.

Steps to address water leakage

1. Check for visible blockages: Inspect the drain line for clogs or kinks. If you can safely access it, clear the blockage to restore proper drainage.
2. Clean the evaporator coils: Dust and grime can cause condensation to build up in the wrong places. Cleaning the coils can help reduce excess water.
3. Consult a professional: If the leakage continues, it could be due to installation faults or more complex issues like a damaged condensate pump. A technician can identify the root cause and fix it efficiently.

Attempting to fix leaks without understanding the underlying issue can lead to further damage. Regular maintenance and professional inspections can help you avoid water damage and keep your system running smoothly.

4. Unpleasant odours during operation

What’s causing bad smells from your split system?

A split system producing unpleasant odours is not just uncomfortable; it may also indicate underlying issues. Common causes include mould or mildew, built-up dust and debris, or in rare cases, electrical components overheating.

These issues can affect air quality and even pose health risks if left unaddressed.

How to eliminate odours and prevent them from returning

1. Clean or replace air filters: Dirty filters are often the culprit behind musty smells. Regular cleaning or replacement can significantly improve air quality.
2. Inspect for mould or mildew: Moisture build-up in the indoor unit can lead to mould growth. A professional cleaning ensures the problem is fully solved.
3. Schedule professional maintenance: Persistent odours often require a deeper inspection. A qualified technician can clean the system, check for damage, and sanitise components to prevent the issue from recurring.

Regular maintenance prevents foul odours and improves your split system’s efficiency and longevity. A professional inspection can ensure your system stays fresh and healthy year-round.

5. System not turning on or frequent shutdowns

Why is your split system failing to operate?

A split system that won’t turn on or shuts down frequently can be frustrating and inconvenient.

Common reasons include electrical faults, thermostat issues, or blocked airflow that causes the system to overheat. In some cases, worn-out components, such as capacitors or compressors, can also be to blame.

How to troubleshoot and resolve operational issues

1. Check the power supply: Ensure the unit is plugged in, the circuit breaker hasn’t tripped, and there’s no power outage in your area.
2. Verify thermostat settings: Incorrect temperature settings or a faulty thermostat can prevent the system from starting. Resetting or replacing the thermostat may solve the issue.
3. Call a professional technician: If the problem persists, it could be an internal fault that requires expert diagnosis. A professional can safely inspect components like the compressor or electrical connections to determine the best solution.
   

Electrical and mechanical issues can escalate if ignored. It’s best to rely on a qualified technician for prompt and reliable repairs. These problems can become even more complex if your home uses a multi-split system, requiring specialised expertise.

Regular servicing can also help identify potential problems before they disrupt your system’s performance.

Keep your split system running efficiently with expert care

Your split system should make life easier, not harder. When issues pop up - whether it’s strange noises, leaks, or poor performance - tackling them early is a smart move.

Thanks to their efficiency and compact design, split systems are a great choice for smaller homes or apartments. However, like any appliance, they benefit from periodic maintenance to keep them running smoothly.

While some fixes are simple, others are best left to the professionals. After all, a well-maintained system doesn’t just keep you comfortable; it saves you time, stress, and money in the long run.

If your air conditioner isn’t pulling its weight, it might be time to call in an expert.  Contact Ozcon Air Solutions for all your split and ducted air conditioning needs. 

With regular servicing and the right repairs, you can keep your system performing optimally for years to come! We also provide complete Supply & Install packages, where we manage the entire process. From choosing where to mount your split indoor and outdoor units to rubbish disposal at the completion of a job, we're here for you.