When your Atwood HydroFlame furnace fails to light or drops out mid-cycle, the igniter electrode is often the first component to inspect. This is the genuine OEM replacement dual sense electrode -- it handles both spark ignition and flame sensing in a single assembly. Correct fitment and a fresh electrode are the fastest path back to reliable heat in your RV.
The Atwood 36998 is a direct OEM replacement for the dual sense igniter electrode used across several popular HydroFlame forced-air furnace models. The dual sense design means a single electrode assembly performs two jobs: generating the high-voltage spark to ignite the propane burner, and then sensing the presence of the flame via ionization current once combustion begins. If either function degrades -- due to carbon buildup, cracking, or gap wear -- the furnace control board will fault and shut the system down for safety.
Replacing with a genuine Atwood electrode (rather than a generic substitute) ensures the correct electrode gap, ceramic insulator length, and terminal configuration for your specific furnace control board. This part is also cross-referenced in the aftermarket as NBK part number 20282.
One assembly handles both spark ignition and ionization flame sensing -- no separate sense probe needed.
Genuine Atwood part 36998, built to the same specs as the original installed at the factory.
Confirmed fit across five HydroFlame furnace models including both the 7900 and 8000 series.
Also listed as NBK 20282 for service technicians sourcing through HVAC supply channels.
On startup, the furnace control board energizes the ignition transformer, which delivers high voltage to the electrode tip. The spark jumps the gap at the burner and ignites the propane/air mixture. Once the flame is established, the same electrode tip conducts a small ionization current back to the control board, confirming that combustion is active. If the board does not detect this signal within the trial-for-ignition window (typically 7-15 seconds on HydroFlame controls), it will lock out and the furnace will not run until the fault is cleared.
A worn or contaminated electrode can cause intermittent ignition, repeated lockouts, or a furnace that lights and then shuts off within seconds. Inspect the ceramic insulator for cracks and the electrode tip for heavy carbon deposits or erosion before condemning the control board.
This electrode is confirmed for use in the following Atwood HydroFlame furnace models:
If your furnace model is not listed above, verify your model number on the furnace data plate (typically located on the exterior access door or the appliance housing) before ordering.
The high-voltage ignition wire and terminal connector are not included -- these are typically reused from the original installation unless damaged. Burner bracket hardware is also not included.