Suburban Furnace Igniter Electrode Assembly | 525009 / 232286

Restore reliable ignition to your Suburban RV furnace with the Suburban 525009 OEM Igniter Electrode Assembly. This genuine Suburban replacement is a critical component in the furnace ignition system — providing the high-voltage spark that ignites propane AND monitoring for flame presence as a safety check. When the electrode fails, the furnace either can't ignite at all or shuts down repeatedly after attempted starts.

Wide Suburban Furnace Compatibility

The 525009 fits an extensive range of Suburban SF, SFV, SH, and SHD series furnaces. Compatible models include:

• SF-20 Series: SF-20, SF-20F, SF-20FQ, SF-20Q
• SF-25 Series: SF-25, SF-25F, SF-25FQ, SF-25Q
• SF-30 Series: SF-30, SF-30F, SF-30FQ, SF-30Q
• SF-35 Series: SF-35, SF-35F, SF-35FQ, SF-35Q
• SF-42 Series: SF-42, SF-42F, SF-42FQ, SF-42Q
• SFV Series: SFV-20, SFV-25, SFV-30, SFV-35, SFV-42, SFV-42Q, SFV-42FQ
• SH-35 Series: SH-35, SH-35F
• SH-42 Series: SH-42, SH-42F
• SHD2542: All variants

Have an SF/SFV "Q" or "FQ" Furnace?

If your furnace is one of the SF-20Q, SF-25Q, SF-30Q, SF-35Q, SF-XX FQ, or SFV-35/42 Q/FQ models, the matching igniter is a different single-electrode design — the Suburban 525051 Igniter Electrode Kit. The two electrodes are not interchangeable — verify your specific furnace model designation before ordering.

⚠️ Critical Serial Number Cutoff — Above 934701426

All models listed above are only compatible if their serial number is ABOVE 934701426. If your furnace's serial number is at or below that cutoff, this 525009 is NOT the correct igniter electrode for your furnace. Verify your furnace's serial number on the manufacturer data label before ordering.

Have an NT Series Furnace?

If your furnace is one of the Suburban NT Series furnaces (NT-12, NT-16, NT-20, NT-24, NT-30, NT-34 and their S/SE/SQ/SEQ/SP variants), neither this 525009 nor the SF/SFV "Q" igniter is the correct replacement. NT Series furnaces use a different igniter — the Suburban 525029 Igniter Electrode. Verify your specific furnace model series before ordering.

How Suburban Serial Numbers Work

Suburban serial numbering may not be intuitive — here's how to read them so you can verify compatibility:

All Suburban serial numbers manufactured after January 1990 are nine digits with embedded date coding:

• First 2 digits: Year of manufacture
• Next set of digits: Week of the year
• Remaining digits: Sequential serial number

Important — read the year first, not the numerical order: A serial number like 912000060 is actually LOWER than serial 014103973, because "91" comes before "01" in manufacturing year sequence (1991 vs 2001). Don't compare serial numbers as plain numerical values — read the year code first.

Cross-Reference: 525009 = 232286

This part is also referenced under the earlier part number 232286. Both 525009 and 232286 refer to the same igniter electrode assembly — either may appear depending on the supplier or service manual.

How the Igniter Electrode Works

The 525009 serves two critical functions in the furnace ignition cycle:

1. Spark generation: Provides the high-voltage spark that ignites propane at the burner when the control board calls for heat
2. Flame monitoring: The probe simultaneously monitors for the presence of flame and sends a signal to the control board confirming ignition. If no flame is detected, the control board attempts re-ignition or locks out the furnace as a safety measure.

This dual function — spark AND flame sensing — means the electrode is critical not just for starting the furnace but for safe ongoing operation.

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
• Furnace lights but immediately shuts off (failed flame sensing causing safety lockout)
• Repeated ignition lockout after multiple failed attempts
• Cracked or chipped ceramic insulator at the electrode
• Carbon buildup or corrosion on the electrode tip
• Visible damage to the electrode probe

If your furnace is failing to ignite reliably, the igniter electrode is one of the first parts to inspect and replace — these are wear items that degrade over time from thermal cycling and combustion exposure.

Genuine Suburban OEM Replacement

As a Suburban factory replacement part, the 525009 is built to original specifications for a precise drop-in fit in compatible furnace installations.

⚠️ 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 and check for gas leaks after any furnace service.

Key Features

• Genuine Suburban OEM igniter electrode assembly
• Wide furnace compatibility — SF, SFV, SH, and SHD2542 series
• Dual function — spark generation AND flame sensing
• Serial number cutoff: Above 934701426
• Cross-reference: 525009 and 232286 are the same part
• Direct OEM replacement

Specifications

• Brand: Suburban
• Part Number: 525009 (also referenced as 232286)
• Type: Igniter Electrode Assembly
• Function: High-voltage spark generation AND flame sensing
• Compatible Furnaces: SF-20, SF-25, SF-30, SF-35, SF-42 series (all base/F/FQ/Q variants); SFV-20, SFV-25, SFV-30, SFV-35, SFV-42 (including 42Q, 42FQ); SH-35, SH-35F, SH-42, SH-42F; SHD2542 (all variants)
• Serial Number Compatibility: Above 934701426