Suburban 231931 Igniter Electrode – Now 525033 (NT-12S / NT-16S / NT-20S Furnaces)

Product Overview

The Suburban 231931 Igniter Electrode (now replaced by part 525033) is a direct replacement ignition component designed for select Suburban NT series RV furnaces. This electrode generates the spark required to ignite the burner, making it a critical part of your furnace’s heating system.

If your furnace is failing to ignite, clicking without lighting, or experiencing intermittent ignition, replacing the igniter electrode is often a fast and effective fix.

This version is supplied without a gasket and is intended for specific NT-S and NT-SE furnace models, including those with serial number requirements.

Key Features

• Replaced by new part number 525033
• Direct replacement igniter electrode for Suburban furnaces
• Designed for NT-S and NT-SE series models
• Produces spark for reliable burner ignition
• Helps resolve no-ignition and intermittent ignition issues
• Single electrode design
• Supplied without gasket
• Durable construction for long service life
• Direct-fit for straightforward installation

Specifications

• Part Number: 231931
• New Part Number: 525033
• Product Type: Igniter electrode
• Configuration: Single electrode
• Includes Gasket: No
• Application: Suburban NT series furnaces

Fits Furnace Models

Important Compatibility Note

• Some models are serial number dependent
• Verify your furnace model and serial number before ordering
• This electrode is designed for the models listed above only

When Should You Replace the Igniter Electrode?

You may need the 231931 / 525033 electrode if your furnace:

• Clicks but does not ignite
• Fails to produce a spark
• Has delayed or weak ignition
• Cycles without producing heat
• Shows visible wear, corrosion, or carbon buildup on the electrode

The igniter electrode is one of the most commonly replaced furnace components.

Why This Part Matters

• Essential for proper ignition of the furnace burner
• Ensures consistent and reliable heating performance
• Helps prevent ignition lockouts and system failures
• Simple, cost-effective repair for common furnace issues

FAQ

What part number should I order now?
The updated replacement is 525033, which supersedes 231931.

Does this include a gasket?
No, this version is supplied without a gasket.

Will this fit all NT series furnaces?
No, it fits only the specific NT-S and NT-SE models listed, including serial number requirements.

What does the igniter electrode do?
It creates the spark that ignites the gas burner in your furnace.

Is this a common replacement part?
Yes, igniter electrodes are one of the most frequently replaced furnace components.