Why an Air Conditioner Clicks
Clicking noises as the HVAC unit turns on or off can be caused by a loose fan or a faulty relay switch.
Home heating and cooling systems make noise. Even the top-of-the-line “quiet comfort” units will hum or buzz when they’re doing their job. The ductwork may accentuate these sounds, adding rattles and vibrations as the system engages and blows air through the vents. These sounds are a normal part of a system’s operation and shouldn’t cause alarm.
However, if the system is making unusual noises the homeowner doesn’t associate with the regular cooling system operation, it may be time for a service call. Some of the sounds emanating from the system as it cycles through the cooling process could indicate a potential problem with the air conditioning.
Causes of AC clicking
A clicking sound is one of the more common but troublesome sounds the cooling system may make. Noticeable AC click sounds can indicate potential problems in several cooling system components. To be sure, there are a few common causes to investigate.
As the unit turns on
Clicking noises as the HVAC unit turns on or off can be caused by a loose fan or a faulty relay switch. Frequently, when a fan becomes loose from lack of maintenance or wear and tear, it will hit against a condenser component. When this happens, often when the fan starts or slows down, the AC will make a clicking sound. It could also be a relay that is not working properly.
The system clicks but doesn’t turn on
If the system clicks but doesn’t turn on, this can indicate a faulty control board, fan motor, capacitor, or switch. Any of these issues will require a licensed technician to repair.
The system runs continuously with intermittent clicking
If the AC runs continually and clicks occasionally, the likely cause is a malfunctioning thermostat. Thermostats wear out over time, wires come loose or short out and can cause undue stress and strain as the “confused” air conditioner struggles to keep up. Even though a thermostat can be an easy fix, a service call is worthwhile to assess any potential damage caused by non-stop running.
Clicking with rattling or shuddering
A clicking or ticking sound, accompanied by rattling and shuddering, can be caused by problems with the compressor. Contact a local HVAC service company to avoid needing a completely new system. The compressor is one of the significant components of the air conditioning system. Any noise from the outside or inside the unit can indicate an impending cooling system breakdown and should be urgently addressed.
Unusual noises not associated with the regular operation of an HVAC system require professional attention. Contact a reputable HVAC service technician for a service call.
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