A sudden onset of air conditioning short cycling usually points to a newly developed mechanical failure, an electrical component breakdown, or an abrupt airflow restriction in your HVAC system. Common sudden triggers include a filter that has become completely clogged with dust and pet hair over a short period, a run capacitor that has suddenly degraded and begun overheating under load, or a refrigerant leak that has rapidly depleted system pressure. Additionally, severe weather events, power surges, or minor lightning strikes can damage delicate electronic control boards or contactor switches, causing them to behave erratically. If your AC starts short cycling out of nowhere, it is best to check the air filter immediately and turn off the system if the behavior persists to protect the compressor from permanent burnout before a professional arrives.
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