Why HVAC Defrost Control Boards Fail and How to Troubleshoot Effectively
The HVAC defrost board plays a crucial role in maintaining optimal system efficiency by controlling the defrost cycle and preventing frost buildup on the outdoor coils. In commercial and residential HVAC units, a malfunctioning defrost control board can lead to poor heating performance, excessive ice accumulation, and reduced energy efficiency. Over time, factors such as electrical surges, corrosion, and faulty HVAC defrost board wiring can cause the board to fail. Understanding how this component works—and how to recognize early warning signs—helps technicians and facility managers take timely action, minimize repair costs, and ensure reliable operation of the entire HVAC system. Common Causes of Defrost Control Board Failure The HVAC defrost board regulates the defrost cycle to prevent coil icing, but over time, electrical or environmental issues can cause failure—understanding these causes helps prevent future breakdowns. Electrical Surges and Power Fluctuations: Voltage spik...