232351 Suburban ON/OFF Switch 

SF-20/25/30/35/42 SF/SFVH-20/25/30/35/42Q, SF-20/25/30/35 42F FQ, SH-35/42 SH-35F 42F, SHD-25/42 SHD-2542Q, NT-12/16/20 S/SE NT-16/20 SQ/SEQ

OEM Furnace Power Switch for NT, SF, SFVH, SH, and SHD Series Furnaces

The Suburban 232351 ON/OFF Switch is the primary low‑voltage power switch used on most Suburban RV furnaces. It controls furnace enable/disable at the appliance and is mounted on the furnace housing. This switch is a common replacement item due to age, heat exposure, or mechanical wear, and is the correct OEM part for a wide range of Suburban furnace platforms.

This switch fits both older S/SE/SQ/SEQ NT‑series furnaces and the full SF/SFVH/SH/SHD families, making it one of the most universal Suburban electrical components.

What this switch does

• Provides the furnace’s main ON/OFF control

• Ensures proper low‑voltage switching for ignition and blower circuits

• Restores reliable operation when the original switch becomes intermittent

• OEM‑matched fit, feel, and electrical rating

When technicians replace this switch

• Furnace won’t turn on unless the switch is jiggled

• Switch feels loose, sticky, or inconsistent

• Furnace intermittently loses power

• Physical damage, heat discoloration, or broken actuator

• Preventative replacement during furnace rebuilds

Compatibility

SF‑Series Furnaces

• SF‑20 / SF‑25 / SF‑30 / SF‑35 / SF‑42

• SF‑20F / SF‑25F / SF‑30F / SF‑35F / SF‑42F

• SF‑20Q / SF‑25Q / SF‑30Q / SF‑35Q / SF‑42Q

• SF‑20FQ / SF‑25FQ / SF‑30FQ / SF‑35FQ / SF‑42FQ

SFVH‑Series Furnaces

• SFVH‑20Q / 25Q / 30Q / 35Q / 42Q

• SFVH‑20FQ / 25FQ / 30FQ / 35FQ / 42FQ

SH‑Series Furnaces

• SH‑35 / SH‑42

• SH‑35F / SH‑42F

SHD‑Series Furnaces

• SHD‑25 / SHD‑42 / SHD‑2542Q

NT‑Series Furnaces

• NT‑12S / NT‑12SE

• NT‑16S / NT‑16SE

• NT‑20S / NT‑20SE

• NT‑16SQ / NT‑16SEQ

• NT‑20SQ / NT‑20SEQ

This is the correct OEM switch for all models listed above.