this indicates either a failed solenoid coil or a physically stuck internal slide within the reversing valve

While the assembly itself is a structural component

Engineered for mission-critical environmental control

Consult the specific York technical guide for de-rating charts to confirm if the #30 drill size meets local manifold pressure requirements

Markel 42297-001 Limit L99H008 this indicates either a failedEnsure the safe operation of industrial and commercial heating systems with the Markel 42297 001 Duct Heater Limit Switch. This high performance safety component is engineered to monitor internal thermal conditions, providing critical overheat protection by automatically disconnecting the electrical circuit when temperatures reach 210 degrees Fahrenheit (99C). Designed for high amperage applications, this 48 amp limit switch features an automatic