Split Type Aircon Icing Up

Introduction

Is your split type air conditioner blowing warm air or making strange noises? You might have a problem with icing up. This happens when ice forms on the evaporator coils inside your aircon unit. Icing prevents the air conditioner from cooling properly, leading to higher energy bills and an uncomfortable home. It’s important to address this issue promptly because prolonged icing can damage your aircon system. Many homeowners experience icing during periods of high humidity or when the aircon is running constantly. Don’t wait until the problem gets worse; early troubleshooting can save you money and prevent costly repairs.

Common Causes of split type aircon icing up

Several factors can cause your split type aircon to ice up:

Low Refrigerant Levels: Insufficient refrigerant reduces the coil temperature, leading to ice formation.
Dirty Air Filter: A clogged filter restricts airflow, causing the evaporator coils to get too cold.
Blocked Airflow: Obstructions like furniture or curtains near the indoor unit can limit airflow.
Dirty Evaporator Coils: Dust and debris on the coils act as insulation, reducing heat absorption and causing icing.
Faulty Fan Motor: If the fan isn’t blowing air across the coils effectively, they can freeze.
Low Outdoor Temperature: Running the aircon in very cold weather can cause the coils to ice up, as some units are not designed to operate at such temperatures.
Restricted Ductwork: Collapsed or blocked ducts can restrict airflow to the indoor unit.
Refrigerant Leaks: Leaks cause a drop in refrigerant pressure, contributing to coil icing.

Symptoms Checklist

Here are some signs that your split type aircon is icing up:

Weak or no airflow from the vents.
Warm air blowing instead of cold.
Visible ice formation on the indoor unit coils.
Water dripping from the indoor unit when the ice melts.
Unusual hissing or bubbling noises.
Higher than usual energy bills.

How to Fix split type aircon icing up Step-by-Step Guide

Follow these steps to troubleshoot and fix the icing issue:

Turn Off the Air Conditioner: Immediately turn off your aircon to prevent further damage.
Inspect the Air Filter: Remove the air filter and check for dirt and debris.
Clean or Replace the Air Filter: If the filter is dirty, clean it with water and mild detergent, or replace it with a new one. Ensure the filter is completely dry before reinstalling.
Allow the Ice to Melt: Leave the aircon off for several hours to allow the ice on the coils to melt completely. You can speed up the process with a fan pointed at the indoor unit (Do not use a hair dryer).
Check for Airflow Obstructions: Make sure there are no curtains, furniture, or other items blocking the airflow to the indoor unit.
Inspect the Outdoor Unit: Ensure the outdoor unit is free from debris, leaves, and obstructions that could restrict airflow.
Clean the Evaporator Coils (If Accessible): If you’re comfortable doing so, carefully clean the evaporator coils with a soft brush or vacuum cleaner with a brush attachment. Be gentle to avoid damaging the fins.
Run the Fan Only: After the ice has melted, turn the aircon to “Fan Only” mode to help dry out the coils and prevent re-icing. Run for 2-3 hours.
Monitor Performance: Turn the aircon back to cooling mode and monitor its performance. Check if the airflow is improved and if the air is cold.
Check the Thermostat Setting: Make sure the thermostat is set to a reasonable temperature. Setting it too low can cause the system to work too hard and ice up.
Check for Leaks (Visually): Inspect the refrigerant lines for any signs of leaks, such as oily residue.
Ensure proper insulation of copper lines: Exposed copper lines may cause aircon icing. Properly insulate the copper lines.

Fix the Issue Without Buying Parts

Many icing problems can be resolved without buying new parts:

Reset the Air Conditioner: Turn off the aircon at the breaker for about 30 minutes, then turn it back on. This can sometimes reset the system and resolve minor issues.
Deep Cleaning: Thoroughly clean the air filter, evaporator coils, and outdoor unit to improve airflow.
Ensure proper airflow: Remove any obstruction around the aircon.
Regular Maintenance: Regularly clean the air filter (every 1-3 months) and inspect the unit for any signs of problems.

When Replacement Might Be Necessary

In some cases, replacement of parts or the entire unit may be required:

Refrigerant Leaks: If you suspect a refrigerant leak (oily residue on the lines), you’ll need to call a professional to repair the leak and recharge the system. A simple recharge might cost $150 – $500, whereas fixing the leak might cost more.
Faulty Fan Motor: If the fan motor is not working, it may need to be replaced. Fan motor replacement cost can range from $100 – $400, depending on the model.
Compressor Failure: If the compressor is failing, the entire aircon unit may need to be replaced. This is often the most expensive repair. Replacing the entire aircon can range from $1500 – $5000 depending on the unit type and installation costs.

Safety Warning

Follow these safety precautions when troubleshooting your aircon:

Always turn off the aircon at the breaker before performing any maintenance or repairs.
Avoid working on electrical components if you are not comfortable or experienced.
Be careful when handling cleaning solutions and tools.
Never spray water directly onto electrical components.
If you are unsure about any step, consult a qualified technician.

Tools You May Need

Here are some tools that might be helpful:

Screwdriver set
Vacuum cleaner with brush attachment
Soft brush
Fin comb (for straightening bent fins)
Cleaning solution (mild detergent and water)
Flashlight

FAQ

Here are some frequently asked questions:

Q: How often should I clean my air filter?
A: Clean your air filter every 1-3 months, depending on usage and air quality.
Q: Can I use my aircon in very cold weather?
A: Most split type aircons are not designed for very cold temperatures. Check your user manual for recommended operating temperatures.
Q: What should I do if I see ice on the outdoor unit?
A: Turn off the aircon and allow the ice to melt. Check for airflow obstructions and clean the coils if necessary. If the problem persists, call a technician.
Q: How do I know if my aircon has a refrigerant leak?
A: Signs of a refrigerant leak include warm air blowing from the vents, hissing noises, and oily residue on the refrigerant lines. A professional is needed to address this.

Conclusion

Troubleshooting a split type aircon that’s icing up can seem daunting, but by following these steps, you can often resolve the issue yourself. Remember to prioritize safety and take your time. If you’ve tried these solutions and the problem persists, it’s best to call a qualified technician to diagnose and repair your aircon system. Taking care of small issues early can extend the life of your air conditioner and keep your home comfortable.