Nexus Triumph – Furnace Igniter & Control Board Replacement

A Nexus Triumph furnace replacement quote landed on my bench last week: $1,247 labor plus $340 in parts, all because the shop wanted to swap the whole assembly instead of diagnosing what actually quit. I’ve been pulling into yards long enough to recognize the pattern—owners push these heating systems hard through the cold months, miss the small signs that something’s wearing out, then find themselves without heat at midnight in a snowstorm with no choice but to call the nearest service center and pay whatever they ask. On Nexus Triumph rigs specifically, the igniter and control board fail in tandem often enough that I’ve stopped treating them as separate problems. Catch the early indicators, though, and this becomes a two-part fix you can execute yourself if you’re willing to spend an afternoon with a socket set and a wiring diagram. What follows is my field-tested approach—the same sequence I run through when I’m standing inside someone’s RV and the clock is ticking.

Suburban 232286 Electrode Assembly: The Igniter That Reliably Sparks

The electrode is where ignition starts—when this component burns out, the control board either goes defensive and locks the unit down or floods the error log with fault codes, and either scenario leaves you in the cold. This isn’t a component that fades gradually; it functions or it fails, and I’ve encountered countless owners who attributed a dead igniter to a dead furnace and replaced hardware that didn’t need replacing.

Performance wins

• Spark engages on the first heating call—no lag time, no extended startup sequences that leave you second-guessing whether the replacement worked.
• The wired assembly arrives protected in its original packaging; you don’t get a bare rod that corrodes during shipping or storage.
• Bracket geometry and terminal alignment conform to Suburban spec—no improvising your installation if you’re working on a 2006-model or later SF-series heating unit.

Performance limitations

• Gap dimension specs don’t always ship printed on the packaging—you’ll want a feeler gauge handy and may need to pull the furnace tech sheet or phone Suburban to confirm the 0.125″ spacing.
• When the board is also in decline (which overlaps symptomatically with igniter failure), installing this electrode will prove the control circuit is the real problem, forcing you to order a second part and schedule another service window.

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)

This post contains affiliate links. As an Amazon Associate, I earn from qualifying purchases at no extra cost to you.