Nexus Triumph – Furnace Igniter & Control Board Replacement

I pull up to broken rigs for a living, and I can tell you without hesitation which repairs show up on my schedule over and over. Not because RVs are poorly built across the board — but because a handful of systems get neglected in exactly the same ways by exactly the same owners. The furnace is one of the biggest offenders: owners run it hard through cold-weather trips, ignore the early warning signs, and then call me in a panic at 11pm when the igniter fails and the control board starts throwing fault codes in the middle of nowhere. On the Nexus Triumph, I’ve seen this combination — a worn igniter paired with a struggling control board — more times than I can count, and the good news is that if you catch it before a full failure, this is a repair you can absolutely handle yourself with the right guidance. What I’ve laid out below is exactly what I do when I’m standing in someone’s rig with a toolbox and a deadline.

The Igniter That Actually Stays Hot: Suburban 232286 Electrode Assembly

The igniter is the first domino—when it fails, the control board either shuts down safe or throws a fault code, and either way you’re not heating anything. This isn’t a gradual wear item; it either sparks or it doesn’t, and I’ve watched owners mistake a dead igniter for a dead furnace more times than I can count.

What works

• Ignition fires instantly on the first demand cycle—no hunting, no soft-start delay that makes you think something’s still wrong.
• Wire assembly arrives intact and sealed; you’re not dealing with a bare electrode that oxidizes before you install it.
• Mounting tab and connector polarity match the OEM spec—no forced fitment or rewiring if your furnace is a 2006 or newer SF-series unit.

What doesn’t

• Aftermarket igniter gap specs aren’t always printed on the box—you’ll need a feeler gauge and may have to reference the furnace manual or call Suburban tech support to confirm your gap is 0.125″.
• If your control board is also failing (common symptom overlap), this igniter will fire and prove the board is the actual culprit, which means a second parts order and another service call.

I had one call where the igniter sparked but the pilot flame wouldn’t hold, and I nearly ordered a new furnace core before I realized the electrode gap had drifted to 0.18″ during shipping—a 30-second feeler gauge check would have saved three hours of troubleshooting. Fit For Suburban RV Furnace Parts 232286,Single Probe Gas Furnace Igniters Electrode with Wire Assembly, Camper Furnace For Suburban 232286 Above 934701426 SF-20, SF-25, SF-30, SF-35 (SF Series)

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