Suburban 233484 Furnace Limit Switch – Replaces 233020 (NT-16SE / NT-20 Series)

Product Overview

The Suburban 233484 Furnace Limit Switch is a direct replacement safety component designed for select Suburban NT series furnaces. This switch monitors internal furnace temperature and automatically shuts down the system if overheating occurs, protecting your RV furnace from damage.

This part supersedes Suburban part 233020 and is required for specific NT series models based on serial number ranges. Replacing a faulty limit switch can restore proper furnace operation and prevent unexpected shutdowns or overheating issues.

Key Features

• Direct replacement for Suburban 233020
• Designed for select Suburban NT series furnaces
• Monitors furnace temperature to prevent overheating
• Automatically shuts off furnace if unsafe temperatures are detected
• Helps restore safe and reliable furnace operation
• Direct-fit design for easy installation
• OEM replacement for proper compatibility

Specifications

• Part Number: 233484
• Replaces: 233020
• Product Type: Furnace limit switch
• Function: Overheat protection / safety shutoff
• Application: Suburban NT series furnaces

Compatible Furnace Models

Suburban NT Series (Serial Number Specific)

• NT-16SE (Above Serial #094100427)
• NT-16SEQ
• NT-20S (Above Serial #093800203)
• NT-20S-TC (Above Serial #093800203)
• NT-20SE (Above Serial #094000057)
• NT-20SEQ
• NT-20SQ

Important Compatibility Note

This limit switch is serial number dependent for certain models.

• Verify your furnace model and serial number before ordering
• Designed specifically for NT series furnaces listed above
• Not compatible with all Suburban furnace models

When Should You Replace the Limit Switch?

You may need the 233484 limit switch if your furnace:

• Shuts off unexpectedly during operation
• Overheats or cycles on and off frequently
• Will not stay running after ignition
• Shows signs of safety shutdown or thermal protection activation

A faulty limit switch is a common cause of intermittent furnace operation.

Why This Part Matters

• Protects your furnace from overheating damage
• Ensures safe operation of your heating system
• Restores proper cycling and performance
• Critical safety component in all RV furnaces

FAQ

Does this replace part 233020?
Yes, the 233484 is the updated replacement for 233020.

Will this fit all NT series furnaces?
No, it only fits the specific models and serial number ranges listed above.

Why is the serial number important?
Suburban updated components across production runs, so compatibility depends on your furnace’s serial number.

Is installation difficult?
Installation is straightforward, but ensure power is disconnected and proper safety procedures are followed.