Important Note
This blog is intended for experienced or supervised technicians. Always take appropriate safety precautions when dealing with live circuits. For informational purposes only. Never attempt to repair circuit boards in appliances or HVAC systems unless you are directly supervised by a professional engineer and doing so under approved ISO and UL processes.
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Alphabetical Links to all Tech Circuit Cheat Sheets/Field References for Appliance/HVAC Techs – CLICK HERE
Common failures of relay driver circuits found on HVAC and Appliance controls.