Newmar King Aire – Furnace Igniter & Control Board Replacement

Some repairs on an RV are DIY-friendly. Others involve propane, 120-volt shore power, or structural load-bearing components where a mistake has real consequences. Part of my job is knowing which category a job falls into — and being honest with owners about the line between a competent DIY fix and one that needs a professional on site. A furnace igniter and control board replacement on a Newmar King Aire sits right in the middle of that line — you’re working with a propane combustion system, and a misdiagnosed control board or an improperly seated igniter doesn’t just mean no heat, it can mean a lockout condition that leaves you stranded, or worse, an unsafe ignition sequence that nobody wants to deal with at 2 a.m. in a cold campground. I’ve walked through this repair enough times on coach-class rigs that I can tell you exactly what the furnace is trying to tell you when it won’t fire, which component is actually at fault, and how to replace it correctly the first time — so follow these steps closely, and don’t skip the safety checks.

The Igniter That Actually Lights on the First Call — Suburban 232286 Electrode Assembly

The igniter electrode is the first thing to fail on a Newmar King Aire furnace, and it’s also the part that determines whether your repair actually works or leaves you troubleshooting electrical connections at midnight. A bad electrode won’t glow, won’t ignite the gas, and will throw a control board error that makes you suspect the whole system is shot.

What works

• Direct replacement for SF-series Suburban furnaces — pin-for-pin compatible with the original 232286, no adapter nonsense
• Wire assembly is pre-attached and correctly gauged so you’re not stripping insulation or second-guessing polarity at the control board
• Glow time drops to 2-3 seconds on a cold start once the electrode is seated properly — immediate confirmation that ignition is working again

What doesn’t

• Aftermarket electrode ceramic is thinner than OEM, so if you overtighten the mounting nut even slightly, you’re cracking it and ordering again
• Some suppliers ship the wire with solder joints that corrode before you even install them — verify the connection is shiny and intact before it goes into the furnace

I once had the electrode test conductive on a multimeter but still wouldn’t ignite until I cleaned the wire connection with contact cleaner and reseated it — made me question whether I’d grabbed a defective unit. 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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