Jayco Redhawk – Furnace Igniter & Control Board Replacement

Skip this repair and you’re looking at no heat when the temperature drops—and on a Jayco Redhawk, a furnace that won’t ignite means you’re either abandoning the rig mid-trip or paying a dealer $400-plus for a diagnosis that should take you ninety minutes and a fifty-dollar part swap. The stakes climb fast once winter weather locks in, and every day without a working furnace eats into your trip plans or costs you real money in emergency service calls.

I’ve spent years inside Redhawks—bought them, torn into them, fixed them, and moved them on. That bench time taught me where the manufacturer made smart choices and where they built in future headaches. The furnace heating system on a Redhawk hits right in that sweet spot: when the igniter fails or the control board misbehaves, you’re holding one of the easiest wins in the entire coach. I’ve walked past rigs sitting on dealer lots priced to move because some previous owner froze out, convinced the furnace was totaled, never realizing the whole job sits under two hours and costs less than a hundred dollars in genuine parts. This breakdown covers exactly how I approach a Redhawk with a furnace that won’t light—no trial-and-error, no throwing parts at the problem, just methodical diagnosis followed by a solid repair.

The Suburban Unit That Cures the Endless Ignition Cycling on Redhawk SF-35 & SF-42 Furnaces

When a Redhawk’s furnace attempts to ignite but the flame never establishes, or the control board keeps sending spark signal after signal without combustion lighting, you’re usually facing a heat exchanger that’s either cracked internally or heavily carbon-coated—and at that point, swapping in a new core is the only genuine solution. Trying to salvage a damaged or fouled core just pushes the real failure a few weeks down the road until you’re stranded without heat.

Where it succeeds

• Installs straight into SF-35, SF-42, and SF-Q platforms with zero modification—threads, bolt holes, and mounting tabs line up identically to the stock Suburban furnace assembly on models from 2008 forward.
• The ignition probe port arrives pre-sized and pre-positioned, so you’re not hand-fitting a 232286 electrode into a misaligned hole or fighting carbon deposits that prevent the sensor from seating flush.
• Flame detection happens cleanly on first light—no repeat false-outs, no constant on-off cycling that turns troubleshooting into an all-night ordeal while you’re sitting in the dark.

Where it stumbles

• Factory cores fetch $300–$450 through Jayco; the aftermarket alternative undercuts that but inventory is spotty and shipping windows stretch to two weeks—not ideal if your furnace dies in December and you’re booked solid through the holiday.
• An igniter electrode or blower motor that’s already at end-of-life won’t magically recover once the new core goes in—if your original 232684 blower is failing or the ignition wire is corroded, you’re buying both parts together, so test the whole chain before ordering anything.

I ordered this core expecting a straightforward swap on a 2015 Redhawk, and the first ignition test had me holding my breath — the flame sensor didn’t respond for a full five seconds and I thought I’d grabbed the wrong SKU. Turned out the old electrode just needed one more cleaning pass before the new core registered it, but that moment made me a believer in testing continuity on your igniter before you blame the housing. 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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