Thor Outlaw – Furnace Igniter & Control Board Replacement

Thor Outlaw furnace failures sit in a blind spot that dealer service bulletins and most owner’s manuals gloss right over. The igniter electrode and its control board don’t fail gracefully — they fail hard, and they fail in ways that leave owners stranded in cold weather thinking the whole furnace assembly is shot when it’s actually just one $80–$150 component. I’ve walked into plenty of rigs where the previous owner had the furnace professionally diagnosed, got quoted $800+ for a full unit swap, and never bothered to ask why the tech didn’t just replace the igniter first. On the Outlaw platform, corroded igniter terminals and heat-cycled control boards are the culprit in the vast majority of no-spark situations — the furnace tries to fire, the electrode doesn’t spark, the board times out and locks the system down, and suddenly you’re convinced you need a new furnace. The real story? A worn-out igniter that’s been sitting through storage seasons, exposure to humidity, or just one too many failed ignition cycles. This is a repair I’ve tackled dozens of times, and it’s straightforward enough to handle yourself if you know which part is actually failing and how to test for it before you start pulling components.

The Igniter That Won’t Fail on a Thor Outlaw Furnace Restart

On Thor Outlaws, the factory igniter electrode degrades fast—especially after storage cycles or inconsistent use—and once it won’t spark, your furnace won’t fire at all, even if everything else is wired correctly. This OEM-spec replacement gets your pilot lit reliably and keeps the control board from cycling endlessly trying to ignite a dead electrode.

What works

• Spark returns immediately—no hunting for ignition, pilot lights first try after installation.
• Wire assembly is pre-attached and correctly gauged, so you’re not chasing continuity problems or soldering connections in a confined furnace cabinet.
• Stops the control board from entering fault mode, which means no more lockout cycles where you have to power-cycle the whole rig to attempt a restart.

What doesn’t

• Installation requires removing the furnace cover and accessing the electrode housing—tight quarters, and if you gap it wrong on reassembly, you’ll have spark but no ignition anyway.
• Shipping delays are common on aftermarket igniter assemblies; if you’re broke down in winter, order this the moment you confirm the igniter is the problem, not after you’ve ruled out everything else.

I once pulled the igniter, visually confirmed it was carbon-fouled, and still second-guessed whether the control board itself had failed—only to swap in this part and have the furnace fire first time, reminding me that 90% of the time the electrode is exactly the culprit. 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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