The Suburban 525019 is a genuine OEM replacement dual-sense igniter electrode for larger NT series and P-series Suburban RV furnaces. This 3-prong electrode features separate probes for spark ignition and flame sensing, providing reliable furnace operation.OEM Suburban3-ProngDual-Sense
Unlike single-sense electrodes that use one probe for both functions, this dual-sense design has two wires to the electrode – one for the high-voltage ignition spark and one for flame sensing. This design was used on furnaces with serial numbers below 920500001. Later furnaces with higher serial numbers switched to single-sense electrodes.
This electrode does NOT include the burner access door gasket. When replacing the igniter electrode, you should also replace the gasket to ensure a proper seal. Order the gasket separately: ➜ Suburban 071076 Furnace Burner Access Door Gasket
This electrode fits the following Suburban furnace models with serial numbers BELOW 920500001:
This dual-sense electrode is ONLY for furnaces with serial numbers BELOW 920500001. If your furnace has a serial number ABOVE 920500001, you need the 525029 single-sense electrode instead. How to read Suburban serial numbers: Furnaces manufactured after January 1990 have 9-digit serial numbers. The first 2 digits indicate the year of manufacture. For example: • Serial number 912000060 = manufactured in 1991 • Serial number 920500001 = manufactured in 1992 Note: Even though 912000060 is numerically higher than 920500001, it represents an earlier manufacture date (1991 vs 1992).
Suburban furnaces have used different electrode designs over the years:
If your furnace's control board has been upgraded to a newer model (like the 521099), you may need the 2-prong single-sense electrode (525029) instead of this 3-prong dual-sense electrode. Updated control boards use the single-sense design.
The dual-sense electrode performs two separate functions via its two probes:
If the flame sensing probe doesn't detect a flame within approximately 7-10 seconds of the gas valve opening, the control board shuts off the gas and enters lockout mode for safety.
1. Disconnect power – turn off furnace and disconnect 12V supply 2. Shut off propane – close tank valve 3. Remove burner access door – locate electrode 4. Disconnect wire(s) – note positions before removing (2 wires on this electrode) 5. Remove mounting screw(s) – extract old electrode 6. Inspect and clean burner – remove any debris 7. Install new electrode – ensure proper gap (~1/8") to burner 8. Replace gasket – use new 071076 gasket 9. Reconnect wires – match original positions 10. Test operation – verify proper ignition and flame sensing
Before replacing the electrode, check these common issues:
When replacing the igniter electrode, always install a new gasket for proper sealing. Order the: Suburban 071076 Furnace Burner Access Door Gasket →
NT = New Technology (DSI ignition) P = Park Model 24/30/34/40 = BTU rating (×1000) S = Standard SP = Side Ports
Suburban Manufacturing (A division of Airxcel, Inc.) Dayton, TN USA Suburban pioneered Direct Spark Ignition (DSI) systems for RV furnaces in the late 1960s and remains the leading supplier of RV heating products.