Do you check the AC with compressor running or not running?

It depends on the purpose of the check. Generally, for routine maintenance or inspections, the AC is checked with the compressor running. This allows technicians to evaluate the performance of the AC unit while it is operating under normal conditions. By running the compressor, they can check factors such as cooling capacity, airflow, refrigerant pressure, and any unusual noises or vibrations.

Checking the AC with the compressor running also allows technicians to identify potential problems or faults that may not be apparent when the compressor is off. Compressor issues, refrigerant leaks, or electrical problems can often be identified more effectively when the system is running.

On the other hand, if the purpose of the check is to perform specific repairs or maintenance tasks that require the AC to be turned off, then the compressor will be turned off during the check or repair.