231807 Suburban limit switch L190-40F 

The Suburban 231807 Limit Switch (L190‑40F) is an OEM‑style high‑temperature safety switch used in Suburban RV furnaces. This auto‑reset switch opens the circuit when the furnace reaches its 190°F limit and recloses after cooling by 40°F, protecting the heat exchanger and internal components from overheating. The L190‑40F rating ensures correct replacement when matching factory specifications for compatible Suburban furnace models.

Built for durability in RV heating environments, this limit switch uses standard spade‑terminal connections for fast installation and restores proper furnace safety‑limit operation.

Key Features

• OEM‑style Suburban furnace limit switch

• Temperature rating: L190‑40F (opens at 190°F, closes at 150°F)

• Auto‑reset high‑limit safety control

• Protects furnace from overheating and heat‑exchanger damage

• Standard spade‑terminal connections

• Durable construction for RV furnace environments

• Direct replacement for models requiring L190‑40F specification

Common Applications

• Suburban RV furnaces requiring L190‑40F limit

• Furnace overheat protection circuits

• Safety‑limit replacement and routine maintenance

Suburban furnace limit switch. L190-40F. Looks like a small sequencer. Base of the switch measures 2" x 1-5/8". 2 male spade wire connectors. Also known as part # 20601L302-54 and 231807.