Palazzo Furnace Igniter & Board Swap - Our Rolling Rambling's

Here’s what most RV owners don’t realize until they’re trying to sell: neglected mechanical systems tank resale value faster than almost anything else. A rig with clean cosmetics and a history of deferred maintenance sells for thousands less than one that’s a little road-worn but mechanically solid. I’ve bought plenty of both. The Thor Palazzo’s furnace system is one I’ve seen fail in a predictable pattern — the igniter burns out or the control board starts misreading signals, and instead of a quick fix, the owner just starts relying on electric heat and hoping nobody asks questions during the walkthrough. What you’re actually dealing with here is a straightforward diagnosis-and-replacement job that any mechanically confident owner can handle, and getting it done right means your furnace fires on the first call every time — which is exactly the kind of thing a serious buyer notices.

The part that fixed it: The igniter that fires first try instead of three cycles later — Fit For Suburban RV Furnace Parts 232286,Single Probe Gas on Amazon →

The Igniter That Actually Lights on Demand — No More “Furnace Won’t Fire” Diagnostics

The igniter is what actually sparks the gas in your Palazzo’s furnace — when it burns out or develops a weak spark, you get the classic “thermostat calls for heat, blower runs, but no flame” scenario. This is the part that fails first in the Suburban SF-series, and it’s the one I replace before I even pull the control board.

What works

Ignites cleanly on cold starts without that hesitation delay you get with a degraded electrode — you hear the spark and smell propane immediately, not three cycles later.
Wire assembly comes pre-attached, so you’re not splicing connectors in a cramped furnace compartment or dealing with burned-out terminals on the control board harness.
Direct fit for SF-20 through SF-35 models — no adapter hunting or clearance issues when you slide it into the combustion chamber.

What doesn’t

Amazon stock on this specific part is inconsistent — I’ve had it ship in 3 days and watched it disappear for two weeks; if you need heat now, you’re better off calling a tech to grab one locally.
The wire assembly can hang loose against the furnace shell if you don’t carefully route it through the existing clips — I’ve seen aftermarket versions pop loose and short themselves out after a month.

I once swapped one of these and the furnace still wouldn’t fire, which sent me down a two-hour rabbit hole testing the control board before I realized the problem was a loose sail switch, not the igniter — so make sure you check airflow activation first. Grab the 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) and test your blower and sail switch while you’ve got the system apart.