Living full-time in an RV changes your math on repairs fast. You start calculating the cost of parts versus the cost of a mobile tech, and you realize that most of these jobs — once you understand the system — are absolutely within reach for someone who’s willing to read a guide, watch a video, and take their time. When the furnace in a Newmar Bay Star Sport stops firing, it’s usually one of two culprits: a failed igniter or a faulty control board — and if you’re parked somewhere cold and that heat goes out, this stops being a convenience issue and becomes a real problem fast. The good news is that both components are replaceable with basic tools, and once you’ve done it, you’ll understand your furnace system well enough to catch the next issue before it leaves you shivering. This guide walks through exactly what we did to diagnose and fix the problem on our own rig, with enough detail that you can do the same.
The Igniter That Actually Fires When Everything Else Tests Fine
The igniter is the first thing that fails on a Suburban SF-series furnace, and it’s the hardest to diagnose because you can have 12V at the control board, gas flow confirmed, and a blower that runs — but the furnace still won’t light. A dead electrode is invisible until you pull it out and see the ceramic cracked or the wire corroded.
What works
- Drop-in fit for SF-35, SF-42, and SF-35Q models — you won’t spend an hour figuring out if this is the right part once you pull the old one out.
- The electrode wire assembly is pre-gapped and ready to seat; you’re not hunting for the exact spacing or crimping new connectors in a cramped furnace compartment.
- Furnace fires on first try after installation — no guessing whether you need to adjust air shutter or second-guess the control board.
What doesn’t
- You have to pull the furnace shroud and access panel to confirm the old igniter is actually the problem — there’s no shortcut diagnosis without seeing the electrode itself.
- Aftermarket versions sometimes have slightly looser connector tolerances than OEM, which means you may need to crimp the spade terminals tighter to avoid intermittent no-fire conditions.
I ordered this part convinced it was the control board causing the trouble, and had the igniter half-installed before I realized the ceramic was visibly fractured — the board was innocent the whole time. 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)
Fit For Suburban RV Furnace Parts 232286,Single Probe Gas
I installed this in my Bay Star and it lit on the first try—no fiddling with gaps or connectors required.
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