525019 230956 RV Furnace Igniter Electrode (Dual-Sense 3-Prong) for Suburban NT-24 NT-30 NT-34 P-40S Series - Fits Serial Numbers Below 920500001

525019 / 230956 RV Furnace Igniter Electrode

Key Features

• High-Voltage Spark Delivery: Engineered to provide a consistent, high-intensity electrical arc for rapid ignition of Liquid Propane (LP) gas, ensuring your RV furnace starts reliably in cold weather.
• Premium Ceramic Insulation: Features a high-density, heat-stabilized ceramic body that prevents electrical "arcing" to the furnace chassis, directing the full spark energy to the burner head.
• Dual-Probe Sensing Design: Serves a dual purpose by providing the ignition spark and acting as a flame sensor (thermocouple replacement) to signal the control board that a flame has been established.
• Corrosion-Resistant Alloy: The metal probes are manufactured from a specialized high-temperature alloy designed to resist oxidation and carbon buildup, extending the intervals between maintenance.

Replaces / Cross-Reference Part Numbers

• 525019
• 230956
• 525019MC

Compatibility & Fitment

This electrode is specifically designed for older Suburban RV furnaces. It is NOT compatible with newer furnaces manufactured after May 1992. Key fitment details include:

• Suburban NT Series: Fits NT-24, NT-30, NT-34, and NT-40 models.
• Suburban P Series: Compatible with P-40S high-capacity models.
• Serial Number Constraint: Strictly for units with serial numbers BELOW 920500001.
• System Type: Designed for 12V DC electronic ignition (DSI) systems utilizing the dual-probe configuration.
• Note: If your serial number begins with "9205" or higher, you likely need part #525028 instead.

When to Replace

• Furnace Clicks but Won't Light: You can hear the rapid "ticking" of the igniter, but the gas fails to ignite, often due to a weak spark or dirty probes.
• Ignition Lockout: The furnace lights for a few seconds and then shuts off. This indicates the flame-sensing side of the electrode is no longer sending a signal to the control board.
• Cracked Ceramic Insulator: Visible hairline cracks in the white ceramic allow the electricity to "leak" to the metal frame, preventing a spark at the burner.
• Soot or Carbon Deposits: Heavy black buildup on the metal probes acts as an insulator, blocking the spark and the flame-sensing current.
• Visible Erosion: The metal probes have burned down or become significantly shorter over years of use, making the gap too large to jump.

Installation Tips

• Safety First (CRITICAL): Turn off the main LP gas supply at the tank and disconnect the 12V DC power before removing the furnace access panel.
• Set the Spark Gap (PRO TIP): Before installing, verify the gap between the two probes is exactly 1/8 inch (3.2mm). If the gap is incorrect, the furnace will fail to ignite.
• Clean the Burner: While the electrode is removed, use a small brush or compressed air to clear any spider webs or rust flakes from the burner slots directly beneath the electrode.
• Check the Lead Wire: Inspect the high-voltage wire connecting the electrode to the board. If the insulation is brittle or cracked, it should be replaced along with the electrode.
• Test the Sense: After installation, ensure the furnace stays lit. If it shuts off after 7 seconds, double-check that the electrode is positioned directly in the path of the flame for proper sensing.