Air Conditioning Noises

Air conditioning noises can be alarming! Fortunately, many of these sounds often have a simple solution, and if a problem requires professional AC repair, it is good to know a trusted heating and air conditioning company.

#1. Thudding Noise

Something as simple as a fan blade coming loose from the motor and bumping and thudding as it spins can cause this type of sound. It is important to inspect the unit to see what has fallen onto the fan before repairing. For safety, homeowners should always disconnect the power to the unit before inspection.

#2. Whistling Noise

If you hear this sound, it could mean there is a broken seal in the ductwork that carries the air from the unit throughout the home. If there are cracks or holes in the ductwork, they can often be repaired by re-caulking or using heat tape to strengthen the seals of the seams.

#3. Screeching Noise

Many pieces of equipment rely on belts to work, including air conditioners. If the unit emits a whining or screeching sound when it comes on, it could mean a belt is old or worn-out and needs replacing.

#4. Rattling Noise

A rattling sound might indicate screws have become loose. Again, remember to turn off the power to the unit before tightening any screws or bolts, and contact a professional if the sound persists.

#5. Clicking Noise

AC Making Clicking Noise But Won’t Start

If your air conditioner sounds like it’s repeatedly clicking as it tries to turn on, then there’s an electrical problem that needs to be corrected. The problem could be a faulty thermostat, a compressor problem, or a capacitor failure. If your AC is clicking but won’t turn on, you should get a professional HVAC technician out right away to resolve the issue.

AC Making Clicking Noise While Running

If the air conditioner sounds like it’s making a repetitive clicking noise that gradually gets faster as the unit powers up it could be a small obstruction. Think of a card in the spoke of a bike wheel. If there is an obstruction like a stick bumping up against the fan, it will cause a clicking sound. Sometimes the AC fan can become loose in its mount and knock against its protective casing too. If you hear a clicking sound while the unit is in operation, you’ll want to call a technician right away. While it’s technically safe to operate the machinery while there is an obstruction, but you may want to turn the air conditioner off to avoid further damaging the components.

#6. Grinding Noise

Grinding sounds also usually come from the fan. Usually, the fan just needs to be lubricated. There would be a more serious problem with the fan motor though, so you would do well to call a professional HVAC technician to take a look and avoid future expensive repairs if there is a bigger problem.

#7. Sparking Noise

The sounds of electrical components on start up and shut down of your air conditioner are normal. If there are continued electrical noises during the operation of your air conditioner, you should immediately turn it off. Do not turn the air conditioner back on until you have had a professional HVAC technician inspect it, especially if a burning plastic or burning rubber smell accompany these strange electrical noises. Sometimes the wire casings of a malfunctioning unit can melt off.

Sparking electrical sounds mean you are at risk of an electrical fire. Stop using your air conditioner immediately until a professional has given it a clean bill of health.

Your AC may be leading to overheating or having too many fluctuations which can cause a short circuit or a fuse to blow up.

#8. Humming Noise

Humming sounds can come from a few different root issues. Sometimes when your starting capacitor is beginning to fail, it can cause a humming noise. Your motor could also be in need of repair. A humming noise can sometimes indicate the motor is struggling.

#9. Rattling Noise

Screws in your system can loosen over time. Sometimes they fall out and rattle around inside your AC when this happens. It’s not ideal, the sound is annoying, but you’re not in any danger by continuing regular AC operation with this sound. You should schedule an appointment with a professional when you can to remove the obstruction. If the screws came off of your fan, sometimes this could cause the fan to become off balance – which affects the performance of your HVAC system, so you will want to get that fixed if for nothing else than for your comfort (and electric bills).

Contact Complete Air Mechanical for Fast AC Repair

If unusual noises coming from your AC have you spooked, contact Complete Air Mechanical for quick, affordable service. Strange sounds can indicate a variety of issues, and you will want to have a professional inspect your AC right away. Our staff understands that the air conditioner is the most important appliance in the house, and we value customer comfort and satisfaction.