525028 Suburban Sail Switch 

Normal stocking item

Replaces: 233352

For Suburban Models: NT-12/16/20/S/SE/SEQ 

The Suburban 525028 Sail Switch is the OEM airflow‑proving switch used in Suburban RV furnaces. It verifies that the blower is moving enough air before allowing the ignition sequence to begin. When airflow is adequate, the “sail” lifts and closes the switch, enabling the furnace to light. If airflow is restricted—due to a weak blower, blocked ducts, or debris—the switch stays open, preventing ignition and protecting the furnace from overheating.

This switch is a direct replacement for Suburban part 233352 and is commonly replaced during no‑heat, intermittent‑ignition, or blower‑only service calls.

Key Features

• OEM‑style Suburban furnace sail switch

• Confirms proper airflow before ignition

• Prevents furnace ignition under unsafe airflow conditions

• Direct replacement for 233352, A33697

• Standard mounting pattern for quick installation

• Durable design for RV heating environments

• Helps resolve “blower runs but no ignition” symptoms

Common Applications

• Suburban RV furnaces with airflow‑verification faults

• No‑heat or intermittent‑heat troubleshooting

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