this OEM HVAC replacement part ensures the control board receives stable data

ensuring the pressure switch proves the circuit for the ignition sequence

While the assembly itself is a structural component

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

Can I use a higher temperature limit switch instead of the CNT1034

Markel 42297-001 Limit L99H008 this OEM HVAC replacement partEnsure 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