233355 Suburban SAIL SWITCH

Normal Stock Item

SAIL SWITCH Replaces – OLD 232279

For Model: NT-40

The Suburban 233355 Sail Switch is the airflow‑proving safety device used in Suburban RV furnaces. Before ignition can occur, the blower must generate enough airflow to lift the internal “sail” and close the switch. If airflow is weak—due to a failing motor, blocked ducts, or debris—the switch remains open, preventing ignition and protecting the furnace from overheating. Because this component sits directly in the blower airstream, it is prone to dust buildup, sticking, and mechanical wear, making it a common cause of “blower runs but no heat” service calls.

Key Features

• OEM Suburban furnace sail switch

• Confirms proper blower airflow before ignition

• Prevents ignition under unsafe airflow conditions

• Direct replacement for 232279

• Standard Suburban mounting pattern for easy installation

• Durable design for RV furnace environments

• Helps resolve intermittent‑ignition and no‑heat issues

Common Applications

• Suburban RV furnaces with airflow‑verification faults

• No‑heat or intermittent‑heat troubleshooting

• Replacing worn, sticking, or debris‑affected sail switches