Much as a doctor performs tests to gather clues about a patient’s ailment, service technicians use tools and procedures to accurately pinpoint why an HVACR system will not function properly. The principles guiding these troubleshooting steps are universal, even if their implementation is not.
source https://www.achrnews.com/articles/140551-10-troubleshooting-diagnostic-tips-for-hvac-technicians-in-the-field
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