Step-by-Step Guide: How to Become a Certified Registered Central Service Technician (CRCST) To become a Certified Registered Central Service Technician (CRCST), an individual must meet the following requirements: High School Diploma or equivalent: Candidates must have a high school diploma or equivalent to be eligible for the certification exam. Work Experience: … [Read more...] about Step-by-Step Guide: How to Become a Certified Registered Central Service Technician (CRCST)