S1-031-03004-000 York DEFROST CONTROL BOARD

The S1‑031‑03004‑000 York Defrost Control Board is an OEM replacement control board used in York, Coleman, and Luxaire heat pump systems. It regulates the outdoor coil defrost cycle by monitoring temperature conditions, sequencing the compressor and fan, and initiating timed defrost operations to prevent ice buildup during cold‑weather operation. Built on a rigid printed‑circuit design, this board provides stable performance, accurate timing, and long‑term reliability. It is the correct replacement when systems experience coil freeze‑ups, short‑cycling, or inconsistent defrost behavior.