Published on Jan 8, 2025|Updated on Mar 9, 2026|By: Jordan Day

The Complete Guide to HVAC PCB Components (Part 1): Resistors, Capacitors, ICs, and Control Board Fundamentals

HVAC printed circuit board showing component designators, resistors, capacitors, and ICs

This is the first article in Jordan Day’s series on Demystifying the Printed Circuit Board. Find Part 2 here.

Key Takeaways
  • Component Identification: Learn to recognize common PCB designators (R=Resistor, C=Capacitor, U=IC) to demystify circuit boards
  • Microcontroller Basics: The “brains” of modern HVAC boards operate on 5V DC and require careful diagnosis beyond simple input/output testing
  • Practical Diagnostics: Visual inspection combined with component knowledge prevents costly misdiagnosis of control boards
  • Safety Critical: Always ensure proper grounding and understand voltage requirements before handling PCBs
Categories:
Electrical
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Jordan Day

Jordan Day brings over 21 years of experience in mechanical systems and building automation, combining his expertise as a Master Plumber, Low Voltage Contractor, and amateur PCB designer to demystify complex HVAC technologies. When he's not programming control systems or designing circuit boards, Jordan can be found mentoring the next generation of HVAC technicians, including his own child who holds the record as the youngest person to obtain Universal EPA 608 certification. Check out Jordan's YouTube Channel for more content!

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