Velocity Boiler Works (Crown) 3503025 Relay L99H008 the York S1-031-02993-000 is an

the York S1-031-02993-000 is an integrated gas/electric control board designed to manage the sequencing for both fuel types in hybrid or package unit configurations

Maintenance-Free Design: Double EPDM O-rings and a fiberglass-reinforced Teflon seat ensure a bubble-tight shutoff without the need for periodic packing adjustments

A "dry" reading confirms the filter drier is functioning correctly

Verify 24V power at the Molex harness

this freeze protection thermostat is the standard for preventing costly coil ruptures

Velocity Boiler Works (Crown) 3503025 Relay L99H008 the York S1-031-02993-000 is anThe Velocity Boiler Works (Crown) 3503025 Relay is a high duty 120V combination relay engineered for precise circuit management in residential and commercial hydronic systems. As a critical boiler replacement part, this component integrates multiple switching functions into a single housing, streamlining the 120VAC electrical path for burners, pumps, and limit controls. Designed specifically for Crown boiler systems, it ensures 60Hz current stability