When an air conditioner turns on, runs for only 2 to 5 minutes, and abruptly shuts down repeatedly, the system is short cycling. This causes extreme compressor wear and poor dehumidification.
When an air conditioner turns on, runs for only 2 to 5 minutes, and abruptly shuts down repeatedly, the system is short cycling. This causes extreme compressor wear and poor dehumidification.
Safety note: Short cycling draws heavy inrush currents that can overheat electrical wiring. If you notice a burning smell, disconnect power.
Compressors have protective pressure switches. If a dirty condenser coil prevents heat rejection, head pressure spikes and the high-pressure switch shuts the compressor down. Once pressures equalize, it attempts to restart, creating a rapid cycle.
Compressors have a bimetallic thermal overload switch inside the casing. If low refrigerant or poor cooling causes the motor to overheat, the switch pops open. When it cools down 15 minutes later, it re-closes and tries again.
If a thermostat is installed near a drafty window, in direct sunlight, or directly beneath a supply air register, it senses artificial rapid temperature fluctuations and cycles the system prematurely.
An AC unit that is too large for your home will cool the air down in 5 minutes before it can remove humidity. Once off, heat radiates back from walls and windows, prompting another short blast.
In moderate summer conditions, a central air conditioner should cycle 2 to 3 times per hour, running for 15 to 20 minutes per cycle. If your system cycles 6, 8, or more times an hour, it is short cycling.
Yes. Starting up is the hardest part of a compressor’s life, drawing up to 5 times running amperage. Short cycling dramatically accelerates mechanical bearing wear and electrical contactor burning.
Call (833) 889-1258 to connect with a cooling specialist.
Call (833) 889-1258