Suburban Furnace Igniter Electrode Kit | 525051 | SF/SFV Q & FQ

Restore reliable ignition to your Suburban RV furnace with the Suburban 525051 Igniter Electrode Assembly Kit. This genuine Suburban OEM single-electrode replacement is the critical spark-generation component in the furnace ignition system — providing the high-voltage spark that ignites propane at the burner when the furnace calls for heat. When the electrode fails or wears out, the furnace can't ignite reliably.

Suburban Furnace Compatibility

The 525051 fits Suburban SF and SFV series furnaces with specific Q and FQ designations:

• SF Series: SF-20Q, SF-25Q, SF-30Q, SF-35Q, SF-20FQ, SF-25FQ, SF-30FQ, SF-35FQ
• SFV Series: SFV-35Q, SFV-35FQ, SFV-42Q, SFV-42FQ

Verify your furnace model on the manufacturer label before ordering — Suburban makes multiple igniter electrodes, and they are not interchangeable across all furnace types.

Cross-Reference Part Numbers

The 525051 is the direct replacement for two earlier Suburban part numbers:

• Replaces 233306
• Replaces 233222

If your existing igniter electrode shows either of those part numbers, this 525051 is the current production successor.

Have a Different Suburban Furnace Series?

The 525051 is specifically for SF/SFV "Q" and "FQ" models. We also carry igniter electrodes for other Suburban furnace series:

• Suburban 525009 Igniter Electrode — for SF/SFV/SH/SHD series (broad coverage, serial above 934701426)
• Suburban 525029 Igniter Electrode — for NT Series furnaces (NT-12/16/20 all serials, NT-24/30/34 serial above 920500001)

Verify your specific furnace model series before ordering — Suburban igniter electrodes are NOT interchangeable across different furnace lines.

Single Electrode Design

The 525051 is a single-electrode design — meaning it provides spark ignition only. Flame sensing in compatible furnaces is handled by a separate sensor component. This differs from dual-purpose electrode designs that combine spark generation with flame sensing in one part.

How the Igniter Electrode Works

When the furnace control board calls for heat, the electrode produces a high-voltage spark that ignites the propane mixture at the burner. The ceramic insulator at the base of the electrode isolates the high-voltage path from ground, focusing the spark at the tip where it's needed. Proper installation and clearance from the burner are critical for reliable ignition.

Common Failure Symptoms

Common reasons to replace the igniter electrode include:

• No spark at the electrode tip when heat is demanded
• Weak or intermittent spark
• Cracked or chipped ceramic insulator at the electrode
• Carbon buildup or corrosion on the electrode tip
• Repeated ignition lockout after failed attempts
• Visible damage to the electrode probe
• Damaged wire lead or connector

The igniter electrode is a wear item that degrades over time from thermal cycling, combustion exposure, and the high-voltage spark itself. Periodic replacement is normal maintenance for older Suburban furnaces.

Complete Kit — Electrode, Mounting Bracket, and Wire Lead

The 525051 arrives as a complete drop-in assembly:

• (1) Electrode — the spark probe
• (1) Mounting Bracket — for installation
• (1) Wire Lead with Connector — 24" long with quick-disconnect terminal

The complete kit means you don't have to source the mounting hardware or wire lead separately — everything needed for the replacement is included.

ISO 9001:2015 Certified

The 525051 is manufactured under ISO 9001:2015 quality certification — Suburban's commitment to consistent quality standards in propane appliance components.

⚠️ Professional Installation Recommended

Furnace ignition components should be installed and tested by a qualified RV service technician. Improperly installed gas furnace components are a fire and carbon monoxide safety risk. Always verify proper ignition operation, electrode gap, and burner clearance after installation, and check for gas leaks.

Key Features

• Genuine Suburban OEM igniter electrode assembly kit
• For Suburban SF and SFV "Q" and "FQ" furnaces
• Single-electrode design — spark generation
• Direct replacement for Suburban 233306 and 233222
• Complete kit — electrode, mounting bracket, and wire lead with connector
• 24" wire lead with connector
• Red color
• ISO 9001:2015 certified
• Built for reliable performance

What's Included

• (1) Electrode (2-7/8" long × 5/16" diameter)
• (1) Mounting Bracket (9/16" mounting hole center-to-center)
• (1) Wire Lead with Connector (24" long)

Specifications

• Brand: Suburban
• Model/Part Number: 525051
• Replaces: Suburban 233306, 233222
• Type: Furnace Igniter Electrode Assembly Kit
• Electrode Design: Single electrode
• Color: Red
• Compatible Furnaces:
  • SF Series: SF-20Q, SF-25Q, SF-30Q, SF-35Q (and FQ variants)
  • SFV Series: SFV-35Q, SFV-35FQ, SFV-42Q, SFV-42FQ
• Electrode Dimensions: 2-7/8" long × 5/16" diameter
• Mounting Bracket: 9/16" mounting hole center-to-center
• Wire Lead Length: 24"
• Wire Lead Connector: Quick-disconnect terminal
• Certifications: ISO 9001:2015