The blower wheel and housing will also squeal when they malfunction. Outdoor fan motors and indoor blower motors squeal loudly when they’re going bad. If it’s not cooling, this could be why.īlower and fan noises such as squeaks, squeals and rattles may be transmitted through the duct system. Refrigerant leaks, resulting in your air conditioning freezing up.The blower is going bad or out of balance.The copper lines from outside to inside are rubbing against something.Outdoor fan motor is loose or about to fail.Debris in either the indoor or outdoor unit.A buzzing noise from your outside unit could mean:.There are a lot of electrical parts in your unit, so it’s critical to pay attention to potential electrical issues as soon as possible before you have bigger issues on your hand. It could be a sign of a defective control or a failing thermostat. The clicking of electrical components at start-up and shutdown is a normal part of the system’s operation, but constant or ongoing clicking is not typical. These types of issues will only get worse and create bigger problems, if ignored. This sound can also mean that the indoor blower or outdoor fan and its blades are out of balance and hitting other parts. The parts inside the sealed unit have likely failed, and the compressor itself may have become loose, possibly requiring a replacement. A banging noise may also indicate that your system needs a compressor replacementĬlanking is another sign of a loose or out-of-balance part. Or perhaps, your indoor blower is unbalanced. Here are some of the common sounds your HVAC system could make and what they may signify.īanging is usually a sure sign that there’s a loose or broken part - a connecting rod, piston pin or crankshaft - inside the air conditioning compressor. The sooner you can determine the cause of the noise and resolve your AC issues, the better. Ignoring the mysterious noises from your AC can turn minor issues into major expenses, as these noises could signal anything from needing a simple tune up to costly repairs, to replacement of the entire unit. So if you hear unusual sounds coming from your air conditioner during normal operation, don't ignore them, as this could be a sign that the unit needs a repair or upgrade. High-efficiency AC units incorporate sound-dampening technology and two-stage (variable speed) compressors to keep noise levels below 55 decibels. Today’s air conditioners are quieter than ever.
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