Forest River Sunseeker – Furnace Igniter & Control Board Replacement

Let a Sunseeker furnace sit dormant through a cold snap with a failed igniter, and you won’t be thinking about the repair cost — you’ll be thinking about how fast hypothermia sets in inside a rig that can’t hold 50 degrees. That’s not hyperbole if you’re parked at elevation in January or anywhere the mercury regularly dips below freezing. I learned this the hard way at 9,000 feet in Colorado when my control board died mid-winter, and the gap between “furnace quit working” and “shelter becomes a survival problem” turned out to be about six hours. This guide walks through the igniter and control board replacement on the Suburban SF-series furnace the way it actually happens — the sequence I used to get heat flowing again, stripped of the dealership cushion-speak and focused on what you need to do when the thermometer is dropping and your family is already in jackets indoors.

The Igniter That Actually Survives Repeated Cold Starts on Suburban SF-Series Furnaces

The electrode igniter is the first thing to fail when you’re cycling your furnace at elevation or in sub-zero temps — it cracks from thermal stress, corrodes from moisture in the combustion chamber, or just stops arcing after a few hundred ignition attempts. When it goes, your furnace won’t light, and you’re troubleshooting in the dark at 3 AM trying to figure out if it’s the igniter, the control board, or a gas supply issue.

What works

• Direct fit on SF-20, SF-25, SF-30, and SF-35 models — no adapter hunting or modification needed, and the wire assembly is already terminated correctly.
• The ceramic probe holds up through repeated thermal cycling; you’ll actually see reliable spark across the gap on every ignition cycle instead of intermittent arcs that make you question your diagnostics.
• Replacement takes 20 minutes if you’ve killed the propane and 12-volt power — no special tools, just access to the combustion chamber and a wrench for the mounting bracket.

What doesn’t

• The wire insulation is thin and vulnerable to chafing if you don’t route it carefully during installation — one careless bundle against a sharp interior edge and you’re looking at a ground fault a month later.
• This is a replacement part, not a diagnostic tool — if your furnace still won’t light after swapping the igniter, you’ve got a control board or gas valve problem, and you’ll be back in the manual anyway.

I had one igniter arrive with a hairline crack in the ceramic that wasn’t visible until I held it up to a flashlight, which meant I nearly installed a dead part and would’ve spent another two days convincing myself the control board was the real culprit. 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.