The Fenwal 35-755900-009 is a microprocessor-based Hot Surface Ignition (HSI) Control Board engineered for precise sequence timing and reliable flame supervision in 120 VAC gas-fired appliances

or frequent short-cycling that cannot be attributed to thermostat or contactor issues

leading to ignition failure or unsafe operation

technicians should discard old housing components as the MKC-2 is a complete magnetic assembly optimized for modern efficiency standards

replacing a weathered 1003687 tube sensor is a standard best practice to ensure the draft inducer motor correctly signals the control board

Schneider Electric (Barber Colman) M313A01 Actuator R-410A The Fenwal 35-755900-009 is aThe Schneider Electric M313A01 Actuator (formerly Barber Colman) is a high performance proportional valve actuator designed for precise flow control in demanding HVACR environments. Engineered for 24V AC operation, this spring return (SR) unit is normally open (N O), ensuring a safe fail position for hot or chilled water applications. As a SmartX Smart X actuator, it is the direct replacement for M113A01 models, offering a seamless upgrade with tool