Aircon Troubleshooting: 8 Common Problems And Solutions

If you’re like most homeowners, your air conditioner (aircon) is one of the most important appliances in your home. That’s why it’s so frustrating when it breaks down. But before you call a technician, there are a few things you can do to troubleshoot the problem yourself. This post will discuss 9 common air conditioner problems and their corresponding solutions. These are particularly useful in case you get yourself caught in another circuit breaker, making it more difficult to book for air conditioning repair.

Keep in mind that these solutions are just general tips – if you’re experiencing a more serious problem with your aircon, it’s best to contact a professional technician.

Damaged compressor

A compressor is a machine that absorbs heat from your home and dissipates it outdoors. In other words, it’s the heart of the air conditioning system. If the compressor malfunctions, you’ll notice an odd sound coming from the unit – a loud groaning or whining noise. This means there’s something wrong with the motor of your air conditioning unit, which will need to be repaired by a professional. Unfortunately, this is something that you cannot solve on your own, although a temporary solution is to try to set your thermostat settings to a level where you do not hear the noise ( if it works).

Not releasing Cold Air

If your air conditioner is not blowing cold air, it might be due to low refrigerant levels. When you turn on the aircon, there’s a specific level of Refrigerant that the machine needs in order for it to work. If this level is too low or zero, your air conditioner will not function properly.

You can check for this possibility by looking at your air conditioning unit’s outdoor compressor unit, which should house an electronic pressure gauge (or sometimes two gauges). There will be digital numbers that show what pressure level is inside – usually, around 60 psi (420 kPa) when idle with no one using the AC. If the outdoor temperature is over 110 degrees Fahrenheit (43 degrees Celsius), then go out and press reset on the side of the pressure gauge.

If the numbers are below 45 psi (310 kPa), there is not sufficient Refrigerant to function correctly. This could be due either to a leak or simply because the Refrigerant needs to be recharged. Refer to your service manual for proper steps on how to recharge your air conditioner unit with more Refrigerant, or call in a professional. Of course, you can also check if there’s even enough electricity running through your home’s circuit breaker box.

AC Refrigerant leak

The Refrigerant in air conditioners is what turns the hot air inside your home into cool air. If there’s a leak in this Refrigerant, you’ll notice that the performance of your air conditioner keeps diminishing over time. As mentioned above, check to see if there are low refrigerant levels first before doing anything else. If the problem is due to a serious leak, then see below for possible solutions:

Check all visible connections on the indoor and outdoor unit

If it’s leaking outdoors, be sure to tighten all couplings with an adjustable wrench or channel lock pliers. If it’s leaking indoors, tighten all couplings with an adjustable wrench.

Inspect the evaporator coils for any dirt, mould, or even rust that could be causing a blockage. Turn off your unit and remove any debris using a brush nozzle on your vacuum cleaner.

Turn on the aircon to see if the leak has been resolved. If you find a severe refrigerant leak, turn off your aircon immediately and contact an HVAC service provider.

Dirty Air filter

You can often tell if there’s a problem with your filter without even looking at it – just listen! If you hear a rattling sound coming from your unit whenever it turns on, one of your filters might be clogged up with dirt and debris, making it harder for air to pass through. In this case, you’ll need to clean or replace the air filter before your unit can start cooling again. This is something that can easily be done at home since the air filter is one of the more visible parts of your air conditioner and requires less effort to clean.

It is important to clean the filter of your air conditioner regularly because this not only makes the air conditioner work more efficiently but also guarantees clean and healthier air for your home.

Frozen Evaporator Coil

When you set your thermostat at a very cold temperature, the Refrigerant starts to accumulate on the evaporator coil. As more and more of it builds up, ice will start to form on this metal surface. Only turn your air conditioner down to this temperature if you have a programmable thermostat, as some units can’t handle very cold temperatures and may freeze up.

Symptoms of this problem include A loud humming or buzzing sound coming from the outdoor unit and complete stoppage in cooling or heating (it could be just blowing out warm air). This problem could significantly affect your air conditioner’s efficiency.

Even if you can’t hear anything wrong with your air conditioning, it’s still possible that there is ice building up on the evaporator coil. You should turn off your air conditioner immediately before it permanently damages your system! If you need to use your unit again, make sure to set your thermostat on a warmer temperature until you’re able to get an HVAC repair technician over for inspection.

Failure of the electrical control board

Sometimes, your aircon’s control board can stop working properly. This may be due to a previous power surge or if the unit is just worn out after years of use. If you notice any problems with your air conditioner after flipping the main power switch back on (excessive noise, failure to cool down), then get an HVAC service provider over ASAP. You will need to call in an air conditioning professional to replace this part for you since it requires soldering and other high-tech electrical work.

Air conditioner making weird noises

When your unit is working just fine, you may not hear it at all. But when something’s wrong with it, you’ll start to notice some strange sounds coming from the indoor or outdoor unit. Here are common problems that will cause abnormal noise:

  • Leaking Refrigerant – this usually causes hissing or whistling sounds if there’s a leak in the system
  • A dirty filter – loose dirt and debris can get sucked up into the fan blades and gears, causing an odd rattling sound inside the compressor. This will only occur when the filter is clogged, so clean or replace old filters regularly.

AC fan failure

This problem will only occur if the outdoor unit’s fan breaks down because it can’t circulate air through the evaporator coil. This issue is common in older units that are past their prime, so check out this guide on how to tell if you need a new unit. If your AC has frozen coils, get an HVAC service provider to inspect your system before further damage occurs! These repairs aren’t easy to do yourself since they involve high voltage electrical components, which professionals should handle.


It’s summertime, which means it’s time to get your air conditioner in working order. If you are experiencing any of these common air conditioning problems, look through our troubleshooting tips below for help getting back up and running quickly.

WhatsApp Chat
Send via WhatsApp
Call Now ButtonCall 8291 3266