Newmar Dutch Star – Furnace Igniter & Control Board Replacement

I taught myself to handle most RV repairs through a combination of YouTube videos, forum threads, and expensive mistakes. The expensive mistakes were the best teachers. This guide covers what I eventually figured out — without the part where you strip a bolt, order the wrong component, and wait a week for the right one to arrive. When your Newmar Dutch Star’s furnace stops firing in the middle of January at elevation, it stops being an inconvenience and starts being a genuine problem — a failed igniter or a dead control board will leave you with a blower that runs but no heat, and if you’ve never chased that diagnosis before, it’s easy to replace the wrong part first. I’ve done this repair twice now on my own rig, once replacing just the igniter and once swapping the full control board after a voltage spike did its damage, so what’s here reflects what actually works rather than what the theory says should work.

The Furnace Core That Actually Survives a Dutch Star’s Temperature Swings

The Suburban SF-35Q core fails not because it’s cheap, but because Newmar Dutch Stars cycle them hard—rapid on-off firing in variable elevation and ambient temps. When the igniter and control board are replaced but the furnace still won’t hold a steady flame or cuts out intermittently, the core itself has usually cracked internally or the heat exchanger has separated at a seam.

What works

• Direct OEM-spec fit for SF-35 and SF-42 series—no adapter plates or creative bracket work required, which means fewer leak points and simpler diagnostics if the furnace misbehaves again.
• Thermal cycling durability is noticeably better than aftermarket clones; you’ll see stable flame modulation at altitude instead of the hunting behavior that comes with a marginal core.
• Warranty parts are actually traceable—if you need a return or replacement, Amazon’s return window and Suburban’s documentation make the process straightforward instead of a forum guessing game.

What doesn’t

• Shipping delay is real—this part is not Prime-eligible from most sellers, which means 5–10 days minimum when you’re already parked in January cold. Plan ahead or pay expedited rates.
• If your igniter or control board is actually the culprit (not the core), replacing the core will feel like a false fix—you’ll heat for an hour, then the igniter fails again and you’re back at square one.

I replaced the igniter and board on my own Dutch Star, fired it up, and watched the flame die after 20 minutes—and for a moment I thought I’d diagnosed wrong and wasted a service call I could have made. Turned out I did need the core after all. Get the Suburban RP-35Q 35,000 BTU/h RV Replacement Core for Suburban Furnace Series SF-35, SF-35Q, SF-42, SF-42Q, and SF-Q (2609A)

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