Forest River FR3 – Furnace Igniter & Control Board Replacement

RV repairs are either thirty minutes or three days — there’s rarely an in-between. The difference is almost always whether you understand the system before you start, whether you have the right tools, and whether you ordered the correct part the first time. I’ve learned all three lessons the hard way, multiple times. The furnace on the Forest River FR3 is one of those repairs that looks simple on the surface — a bad igniter or a fried control board — but it’ll eat your whole weekend if you misdiagnose which component actually failed, or if you swap the igniter only to realize the board was sending bad signals the whole time. I’ve bought rigs where the previous owner already replaced the igniter twice without ever testing the board, and I’ve done the same dumb thing myself early on; this guide exists so you don’t repeat that mistake.

The Igniter That Won’t Leave You Stranded Mid-Winter

The Suburban furnace igniter is the first thing to fail on an FR3, and it’s almost always the culprit when you’re getting no spark, no ignition, and no heat in freezing weather. If your igniter glows but won’t light the burner, or doesn’t glow at all, this electrode assembly with the wire harness is the part that actually gets you back online.

What works

• Drop-in fit for SF-series Suburban furnaces — no adapter hunting or fabrication required once you’ve got the access panel off.
• The wire assembly is pre-terminated and won’t fray or short inside the furnace cavity like a jury-rigged replacement would.
• Once installed and the control board is powered, you’ll see consistent spark at the electrode within seconds — heat is back the same day.

What doesn’t

• Two-week lead time on some units — not helpful if you’re parked in the Rockies in November and just watched the old igniter die.
• If your control board is also toast, swapping the igniter alone won’t solve a no-heat problem; you’ll have ordered the wrong part and wasted a weekend troubleshooting.

I replaced this exact igniter on my FR3 last March and second-guessed myself when the spark was weak for the first 30 seconds after power-up — thought I’d gotten a dud until the control board cycled and reignition fired normally. 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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