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a blocked vent safety switch must be manual reset (M/R)
check specific technical data for gas-rated alternatives
It will maintain its last position upon a loss of power
How do I confirm the rotation needed for my unit
It provides the necessary millivolt output to keep your gas valve energized
York S1-031-09187-000 Control Board L99H008 a blocked vent safety switchThe York S1 031 09187 000 Control Board is a critical OEM replacement part designed for single stage spark ignition HVAC systems. Engineered for high performance gas fired appliances, this integrated furnace control manages the pilot ignition sequence, gas valve operation, and flame sensing with precision. As a veteran grade HVAC ignition control board, it features built in diagnostic LED indicators that allow field technicians to rapidly troubleshoot
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