S1-031-01971-000 York Defrost Control Board

The S1‑031‑01971‑000 York Defrost Control Board is a factory‑authorized replacement designed to restore proper defrost operation in compatible York, Coleman, and Luxaire heat pump systems. This control board monitors outdoor coil temperature, manages compressor and fan sequencing, and initiates timed defrost cycles to prevent ice buildup during cold‑weather operation. Its durable PCB construction ensures stable performance, accurate timing, and long‑term reliability. Ideal for technicians replacing failed or intermittent defrost controls that cause coil freeze‑ups, short‑cycling, or reduced heating efficiency.