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How to Repair Window & Split Air Conditioners

How to Repair Window & Split Air Conditioners-min

Window and split air conditioning systems often become our trusted companions during scorching summer days when the sun is at its peak. However, even our most dependable allies can occasionally falter and leave us with internal issues.

The good news is that dealing with these problems isn’t an insurmountable challenge when you possess the knowledge and skills to repair them. In this blog, we’re here to lead you through the correct methods for repairing both windows and split AC systems. With the right knowledge and the necessary tools at your disposal, you can give new life to your HVAC system effortlessly.

Step-By-Step Guide to Window and Split AC Unit Repair

1. Understanding Your System

Before embarking on the journey of window unit AC repair, it’s crucial to comprehend the intricacies of these machines. You have two main types of windows and split AC systems, each with its own set of components and operational systems.

  • Window Air Conditioning System

How to Repair Window & Split Air Conditioners-min

Window AC is the compact and often the go-to choice for small or individual rooms. They are designed to be installed in a window or a specially prepared wall opening.

These units consist of a single enclosure housing all the essential components, including the evaporator, condenser, compressor, and cooling coil. The cooling process takes place within this single unit, which is then placed directly in your window.

  • Split Air Conditioning System

Split air conditioners, on the other hand, are more complex and versatile. They consist of two main components: the indoor unit and the outdoor unit. The indoor unit, usually mounted on a wall, contains the evaporator coil and a fan to distribute cool air.

The outdoor unit houses the compressor, condenser coil, and another fan. These two units are connected by refrigerant lines and electrical wiring. Understanding which type you have is the first step toward repairing and troubleshooting.

Window units are relatively simple to diagnose and repair, while split systems can require a more in-depth approach due to their divided structure.

2. Tools and Safety Precautions

It’s necessary to gather the all-important tools and follow the safety precautions to ensure your well-being and prevent further damage to the AC unit.

Here’s the list of all the essential tools that you’ll need:

  • Screwdrivers

Various sizes of screwdrivers are essential for opening panels and accessing components.

  • Pliers

Pliers can help you grip, bend, or cut wires and other components.

  • Multimeter

This tool is used to check electrical continuity and voltage, aiding in diagnosing electrical issues.

  • Pipe Cutter/Flaring Tool

If you’re working on refrigerant lines, you’ll need these tools to cut and flare copper pipes.

  • Vacuum Pump

It is vital for removing air and moisture from the refrigerant lines after repair or maintenance.

  • Safety Gear

Always wear safety glasses, gloves, and, if you’re dealing with refrigerant, a face mask to protect yourself.

  • User Manual

Consult your AC unit’s user manual for specific instructions and diagrams relevant to your model.

DIY Repairs for Window AC Unit

Window air conditioning systems are relatively straightforward, making them ideal for DIY enthusiasts. Here’s the process of addressing any issue you find in your window a/c unit.

  • Cleaning the Filters

A dirty or clogged filter can reduce the cooling efficiency. Simply remove the filter, clean it with mild detergent, rinse, and let it dry before reinserting.

  • Fixing the Thermostat

If your unit isn’t maintaining the desired temperature, check the thermostat. It may need calibration or replacement.

  • Addressing the Refrigerant Leaks

If you suspect refrigerant leaks, look for oily stains or hissing a sound near the coils. If you find a leak, call a professional for repair, as refrigerant leaks require expertise.

  • Lubricating Moving Parts

Some window AC units have motors with oil ports. Lubricating these parts can prevent friction and improve performance.

Window AC Compressor Not Turning On

DIY Repairs for Window AC Unit

If your window AC compressor isn’t turning on:

  • Check the power supply.
  • Ensure the thermostat is set correctly.
  • Inspect the capacitor and wiring.

If issues persist, seek professional assistance.

DIY Repairs for Split AC

Split air conditioning systems offer more advanced features and a higher cooling capacity, but they also come with their own set of issues that can be resolved through DIY repairs:

  • Cleaning the Indoor and Outdoor Units

Regularly cleaning the indoor and outdoor units is crucial. Remove dust, leaves, and debris from the outdoor unit’s fins and ensure the indoor unit’s evaporator coil and blower fan are clean.

  • Fixing Refrigerant Leaks

Like window units, split AC systems can develop refrigerant leaks. Signs include reduced cooling efficiency and hissing sounds. Contact a professional for repair, as dealing with refrigerants requires expertise and specific tools.

  • Replacing a Faulty Compressor

A malfunctioning compressor can be a major issue. Replacing it is a complex task best left to professionals, but understanding the symptoms can help you identify the problem.

  • Routine Filter Cleaning

Just like window units, split AC systems have filters that need regular cleaning or replacement. Neglecting this task can lead to reduced airflow and efficiency.


Armed with knowledge about your specific system and the common problems it may face, you’re better prepared to address issues as they arise. You can take the DIY route for minor problems or seek professional help for complex issues. But remember that regular maintenance is the key to enjoying cool and comfortable indoor environments throughout the hottest months of the year.

Join hands with HOMERIGHT Heating and Conditioning Inc. so we can provide you with incomparable window AC unit installation and maintenance services. Contact us anytime to take advantage of our excellent services.

Frequently Asked Questions

Why Is My Window Ac Not Cooling?

There may be a number of causes for your window air conditioner to not be cooling, including: • Low Refrigerant Levels • A Dirty Evaporator Coils • Faulty Fan Motors or Fan Blades • Damaged Heat Pumps • Extremely Hot Environment

How To Recharge Window Ac?

Take the following steps to recharge your window air conditioner: • Detach the device from the window and unplug it. • Using the screwdriver, slide the unit from its cover. Place the device on a table or in another appropriate location so that you can work on it. • Look out for leaks. Use a leak detector or soap bubbles around components. If there are no leaks, move on to the next stage. • Join the manifold gauge set and the refrigerant container. • Let refrigerant flow into the system by opening the valve on the low-pressure side. • Exercise caution to avoid overcharging the system. • After recharging, check performance to make sure the system is operating effectively.

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