Lg Ac Not Cooling But Fan Is Running

Introduction

It’s frustrating when your LG air conditioner’s fan is blowing, but the air isn’t cooling. This usually means something is preventing the AC from completing the cooling process. This situation is common during peak summer heat or after periods of heavy AC use. It’s important to address this quickly because running an AC that isn’t cooling properly can waste energy and potentially damage the unit further.

Common Causes of LG AC Not Cooling But Fan Is Running

Here are some common reasons why your LG AC might be blowing air but not cooling:

Dirty Air Filter: A clogged filter restricts airflow, making it harder for the AC to cool the air.
Frozen Evaporator Coil: This happens when airflow is restricted or the refrigerant is low, causing ice to form on the coil.
Dirty Condenser Coil: The outside units coils release heat. If they are dirty, they cant do this effectively.
Refrigerant Leak: Low refrigerant levels mean the AC cant cool properly.
Blocked Condenser Fan: If the fan on the outside unit isnt spinning properly, it cant release heat.
Faulty Compressor: The compressor is the heart of the AC system. If it fails, the AC wont cool.
Capacitor Issues: Capacitors help start and run the fan and compressor motors. A weak capacitor can prevent these components from working properly.
Thermostat Problems: If the thermostat isn’t set correctly or is malfunctioning, it may not be signaling the AC to cool.

Symptoms Checklist

Use this checklist to pinpoint the issue:

The AC fan is running, but the air coming out is not cold.
You hear unusual noises coming from the indoor or outdoor unit.
Ice is visible on the indoor unit’s evaporator coil.
The outdoor unit’s fan isn’t spinning, or is spinning slowly.
The AC is running constantly, but the room isn’t getting cooler.
Your energy bills have suddenly increased.

How to Fix LG AC Not Cooling But Fan Is Running Step-by-Step Guide

Follow these steps to troubleshoot your LG AC:

Turn off the AC: Switch off the AC at the thermostat and the circuit breaker for safety.
Check the Air Filter: Remove the air filter from the indoor unit. If it’s dirty, clean it with water and mild soap (if it’s washable) or replace it with a new one. Let it dry completely before reinstalling.
Inspect the Evaporator Coil: Locate the evaporator coil (usually behind the air filter). If it’s covered in ice, let it thaw completely (this may take several hours) before proceeding. Make sure the filter is clean before restarting the unit, otherwise the coil may freeze again.
Clean the Condenser Coil: Locate the outdoor unit. Use a garden hose (with a gentle spray nozzle) to clean the condenser coils. Spray from the inside out to remove dirt and debris. Be careful not to bend the fins.
Check the Condenser Fan: Ensure the fan blades are free from obstructions (leaves, branches, etc.). Carefully try spinning the fan with a stick (power off!). If it doesnt spin freely, something might be jamming it.
Thermostat Settings: Make sure the thermostat is set to “Cool” and the temperature is set lower than the current room temperature. Also, check the batteries in your thermostat and replace them if needed.
Check the Circuit Breaker: Ensure the circuit breaker for the AC hasn’t tripped. If it has, reset it. If it trips again immediately, there might be a more serious electrical problem.
Inspect for Leaks: Look for any signs of refrigerant leaks, such as oily residue or hissing sounds around the connections on the indoor and outdoor units. (If you see any, its a sign of a bigger problem).
Restart the AC: Turn the circuit breaker back on and turn the AC back on at the thermostat.
Monitor Performance: Give the AC at least 30 minutes to an hour to see if it starts cooling properly.
Check Drain Line: A clogged drain line can prevent proper cooling. Look for a small drain pipe near the indoor unit and make sure it’s clear. You can try using a wet/dry vacuum to suck out any clogs.

Fix the Issue Without Buying Parts

Here are some no-cost solutions:

Reset the AC: Turn off the AC at the thermostat and circuit breaker for a few minutes, then turn it back on. This can sometimes resolve minor issues.
Regular Cleaning: Clean your air filter monthly and the outdoor unit’s coils at least twice a year.
Ensure Proper Airflow: Make sure furniture or curtains aren’t blocking the vents in your home.
Inspect for Obstructions: Regularly check the outdoor unit for debris and clear away any vegetation that might be growing too close.
Run a Fan: Use ceiling fans or portable fans to circulate air and help the AC cool more efficiently.

When Replacement Might Be Necessary

If you’ve tried all the troubleshooting steps and your AC still isn’t cooling, it might be time to call a professional. Component failure, such as a faulty compressor or a significant refrigerant leak, often necessitates professional repair or even replacement. Expect to pay between $150-$500+ for a compressor repair, and a complete AC replacement can range from $3,000 to $7,000+ depending on the unit size and complexity of installation. Common parts that fail are capacitors ($50-$200) and compressors ($500-$1500 just for the part).

Safety Warning

Always turn off the power to the AC at the circuit breaker before performing any maintenance or repairs.
Avoid touching any electrical components inside the unit.
Do not use excessive water pressure when cleaning the condenser coils, as this can damage the fins.
If you’re uncomfortable working with electrical components, contact a qualified HVAC technician.

Tools You May Need

Screwdriver (Phillips and flathead)
Garden hose with spray nozzle
Wet/dry vacuum
Fin comb (for straightening bent condenser fins)
Work gloves

FAQ

Here are some frequently asked questions:

Q: How often should I change my AC filter? A: At least every 1-3 months, or more often if you have pets or allergies.
Q: Why is my AC making a loud buzzing noise? A: This could indicate a problem with the capacitor or compressor. Contact a professional.
Q: How do I know if my AC is low on refrigerant? A: Common signs include weak airflow, ice on the evaporator coil, and the AC running constantly without cooling effectively.
Q: Can I add refrigerant to my AC myself? A: No, refrigerant handling requires specialized equipment and training. It’s best to leave this to a qualified HVAC technician.

Conclusion

Troubleshooting your LG AC can seem daunting, but many common issues can be resolved with simple steps. By following this guide, you can potentially save yourself the cost of a service call. However, if you’re uncomfortable performing any of these steps or if the problem persists, don’t hesitate to contact a qualified HVAC technician for assistance.