Staying Up On Furnace Maintenance

2 Noises From Your Central Air Conditioner That Mean Immediate Attention Is Needed

When you live in a house that uses central air conditioning, you are probably used to the normal sounds that the unit makes, such as the initial clang when the compressor switches on or the low humming of the blower fan turning. However, if you hear either of the noises below, your AC unit needs immediate professional attention.

1.  Loud Screeching Noises When the Unit Is Running

One noise that may start coming from your air conditioning unit that you should not ignore is often heard shortly after the unit kicks on. At first, you may hear the usual low humming sound of the unit. However, after a minute or two, you may start hearing a loud screeching noise that sounds like metal scraping metal.

If you do hear this sound, there are two possible causes, both of which will need to be fixed as soon as possible. The first possible cause of the screeching is a loose or partially broken blower belt. If the belt is not soon replaced by a professional, it will eventually break completely and leave you without air conditioning.

A second possible cause is that the bearings inside of the motor are either dry or worn out. If they are dry, they need to be lubricated before they cause the motor to overheat and burn out. If they are worn out, they will need to be replaced by a repair technician.

2.  Constant Hissing or Bubbling Sounds Even after the Compressor Turns Off

Another sound that you may start hearing can happen both while the unit's compressor is on and when it is off. If you hear a constant hissing or bubbling noise coming from your air conditioner, this sound needs immediate attention from both you and an HVAC professional.

When you hear either the hissing or bubbling, you most likely have a refrigerant leak somewhere in the compressor or coolant lines. Since a leak can send dangerous gases throughout your home, you need to turn off your unit immediately and contact a repair service right away to have them check out the unit before you run it again.

Hearing either of the above noises most often means that there is a serious problem with your central AC unit which needs to be seen to by a professional as soon as possible. Contact an HVAC contractor who offers air conditioner services to have them inspect and fix any issues before more damage is done to the unit.