Tiffin Wayfarer – Furnace Igniter & Control Board Replacement

I was three weeks into November somewhere near the Utah border when the Wayfarer’s furnace just stopped cooperating. Nights were dropping into the low 30s, and I’d wake up to that telltale clicking — the igniter trying to spark but nothing catching. Before I wasted a service call or started second-guessing myself with dealer parts, I realized something: this exact failure pattern is one of the oldest tells in full-time RV ownership. The igniter electrode cracks from temperature stress, the control board quits detecting spark, and suddenly you’ve got a paperweight where your heat source used to be. But here’s the thing — I’ve pulled and swapped enough of these units to know it’s almost never as dire as it feels at 2 AM in the cold. That cracked electrode, that failed spark signal, it’s a three-part puzzle, and once you solve the first piece, everything else clicks into place. This breakdown shows you exactly which parts actually fail, how to confirm which one is gutting you, and how to get your furnace running hot again without the dealer markup or the guessing game.

The Electrode Assembly That Cuts Through “No Heat” Diagnosis on Tiffin Wayfarer Furnaces

Suburban furnace igniters split and degrade from repeated heating cycles — particularly on long-in-the-tooth Wayfarers that pull hard through seasonal swings — and once the electrode fractures, the control board loses spark confirmation, leaving you without warmth and without a fault indication. This spark electrode is your diagnostic pivot point: replace it first, and you’ll either see immediate ignition or you’ve narrowed your problem down to what’s happening below on the control board side.

What performs

• Direct swap into SF-series Suburban ignition systems — the connector assembly interfaces straight into your board with zero modifications or intermediate connectors required.
• You’ll get audible spark the moment ignition cycle kicks in; that acoustic feedback tells you electrode contact is solid and your board is still firing the signal down the line.
• Eliminates throwing cash at a control board replacement when your real culprit is actually sitting in your hand.

What doesn’t work as well

• Delivery windows from independent distributors balloon to 2–3 weeks; if you’re stranded mid-winter, that timeline becomes a real problem.
• A few aftermarket versions come with connector strain relief that’s a touch loose; make sure your plug seats all the way in before you close the furnace enclosure back up.

I’ve had this igniter arrive and watched the spark gap test fail because the wire wasn’t fully seated in the connector — thirty seconds of wiggling fixed it, but that moment of doubt cost me an hour of troubleshooting when I should have been on the road. 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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