Fast System Diagnostic: Replacing worn sensor wires often resolves intermittent flame rectification issues and nuisance shutdowns

F fixed differential

Is this switch compatible with POE or PVE oils

this assembly ensures consistent flame rectification and reliable ignition

Verify the drain line slope (minimum 1/8" per foot) and ensure the primary drain fitting is not over-tightened

Utica-Dunkirk 240006940 Damper 340155-7024 Fast System Diagnostic: Replacing wornUpgrade your systems efficiency with the Utica Dunkirk 240006940 Damper, a 8 inch automatic vent damper engineered for precision airflow control in hydronic heating applications. Built with heavy duty galvanized steel, this OEM replacement part is specifically designed for compatibility with Utica MGB Boiler Series and Dunkirk DXL Series units. The automatic actuator ensures the flue remains closed during the off cycle to prevent standby heat loss,