providing a reliable automatic changeover when the media temperature shifts between heating and cooling cycles

Common codes include a single flash for an airflow fault (check your pressure switch)

check the lead wire diagram for CW or CCW orientation

always verify your specific model wiring diagram

Fenwal 35-703920-009 Board R-410A providing a reliable automatic changeoverAs a technician, you know that intermittent ignition failures are usually traced back to a failing control module. The Fenwal 35 703920 009 Ignition Control Board is a specialized 120V DSI (Direct Spark Ignition) module engineered for precision timing and flame monitoring in residential and commercial atmospheres. This Fenwal 35 70 series control utilizes a microprocessor to provide constant self diagnostics and safe start checks, ensuring the gas