What might cause a compressor to short cycle?

A compressor short cycling occurs when the air conditioning system frequently turns on and off in short intervals rather than running continuously for a longer period. This can be caused by several factors, each of which is critical to the system's operation.

An incorrect refrigerant charge can lead to underperformance or overcooling. When the refrigerant charge is too low or too high, it affects the system's ability to maintain the desired temperature, which may trigger the compressor to cycle on and off rapidly to attempt regulation.

A malfunctioning thermostat can provide inaccurate temperature readings, leading the system to turn on or off at inappropriate times, causing short cycling. If the thermostat believes the space is either too warm or too cool due to faulty readings, it can lead to the compressor rapidly switching states.

Insufficient airflow across the evaporator can result from blocked ducts, dirty filters, or other obstructions. When airflow is restricted, the evaporator coil can freeze or not transfer heat effectively, prompting the system to short cycle as it struggles to achieve the desired cooling output without adequate airflow.

These interconnected issues highlight that multiple factors can contribute to a compressor's short cycling, making “all of the above” the most comprehensive and correct answer.