Went ahead and inspected system, noticed that system had a 4° superheat on a piston Found micro leak in evaporator coil But that didn’t explain why it froze up Went ahead and inspected filters, 1 was clean, 1 was clogged dirty, customer just recently had some remodeling done, the other filter was normal dirty. Lack of airflow was the cause of the coil freezing up Customer refused to pay service fee