Fleetwood Bounder – Furnace Igniter & Control Board Replacement

A Fleetwood Bounder furnace igniter replacement runs $280 to $420 in labor alone at most RV service centers — and that’s before the part itself. Add a control board failure into the mix and you’re looking at a shop bill that climbs past $800 without much effort. But here’s the thing: if you’ve got a weekend, basic hand tools, and access to the furnace compartment, this is a repair that pays for itself the first time you avoid that service call. I’ve pulled apart enough Bounders to know exactly which symptoms mean igniter, which mean control board, and which mean both are heading south together. This breakdown walks you through the diagnosis, the parts that actually hold up, and the step-by-step process I’ve used to get heat flowing again on Bounders parked in November cold with no hookups nearby. If your furnace is clicking but not catching spark, running through blower cycles that go nowhere, or throwing fault codes that make no sense, you’re looking at one of these two components — and this is how you fix it without spending a whole paycheck at the dealer.

The Igniter Electrode: Why It Fails First on a Bounder

The igniter electrode takes the voltage pulse from your control board and creates the spark that lights the burner — and it’s also the part that wears out fastest on Fleetwood Bounder furnaces. Once it cracks, corrodes, or loses its conductive surface, you’ll get a dead ignition system even if everything upstream is firing correctly.

Why this replacement actually works

• Spark ignition catches on the first or second heating cycle every single time — no slow spark buildup, no hunting for ignition point.
• The wire harness ships color-matched and pre-terminated, so you’re just plugging connectors instead of hand-crimping bare probe wire in a dark cabinet.
• Fits SF-35, SF-35Q, and SF-42 furnace assemblies across multiple Bounder model years without surprises — parts suppliers keep this one on the shelf because it moves.

Where you run into trouble

• Most aftermarket igniters take 2–3 weeks for delivery, which means if you’re parked somewhere cold in late fall, you’re hiring a mobile technician instead of waiting for mail.
• If your control board is also degrading (sending a weak spark signal), the igniter replacement alone won’t solve the problem — you’ll end up pulling the furnace cabinet apart a second time.

I ordered what I thought was the right igniter based on a forum recommendation and didn’t catch the part number mismatch until it arrived — it was designed for a slightly different burner configuration and would have required rewiring the probe position. 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)

Parts and Tools

• Replacement igniter electrode with wire assembly matched to your furnace model (232286 for most Bounder applications) — check current price
• Furnace control board replacement unit compatible with your Bounder’s ignition system and voltage specifications
• Needle-nose pliers for disconnecting small wire terminals and removing the igniter electrode from its mounting bracket
• Multimeter capable of reading DC voltage and resistance to test igniter continuity and control board output
• Small flashlight or headlamp to see inside the furnace compartment and igniter mounting area clearly
• Wire strippers and electrical tape for reconnecting or resealing any wire connections during reassembly

Step-by-Step Instructions

Step 1: Kill power to the furnace and verify it’s dead

Locate the furnace’s 12V DC power source (usually a dedicated breaker on your coach’s electrical panel) and switch it off. Wait 30 seconds, then try the furnace thermostat—nothing should happen. This prevents accidental spark or control board damage while you’re working. Take a photo of the wire connections at the control board before you touch anything, so you know exactly where each wire goes when reassembling.

Step 2: Access the furnace compartment and locate the igniter

Open the furnace access panel (usually on the side or bottom of the unit, held by two or three screws). The igniter electrode is a ceramic or metal probe mounted near the burner assembly, with a wire running back to the control board. Look for visible cracks, discoloration, or corrosion on the probe tip. If it’s visibly damaged or blackened, the igniter is your culprit.

Step 3: Test the igniter and control board with a multimeter

Set your multimeter to resistance (ohms) mode and touch the probes to the igniter wire terminals. A good igniter reads between 4 and 14 ohms; anything higher or infinite resistance means it’s failed. If the igniter tests good, switch to DC voltage mode, restore power briefly, and measure the voltage at the control board’s igniter output terminal while the furnace attempts to ignite. No voltage or erratic readings point to a failed control board.

Step 4: Disconnect and remove the old igniter electrode

Using needle-nose pliers, carefully disconnect the two small wire terminals from the igniter. Note which wire goes where (or photograph it). Locate the mounting bracket or clip holding the igniter probe and unscrew or unclip it—usually one or two fasteners. Gently pull the igniter straight out; don’t bend the ceramic probe. Set the old unit aside.

Step 5: Install the replacement igniter electrode

Slide the new igniter probe into the mounting bracket, ensuring the ceramic tip sits at the correct distance from the burner (typically 1/8 inch gap). Tighten the mounting fastener snugly but not hard—ceramic cracks easily. Reconnect the two wire terminals to the new igniter, matching your photo or the color-coded wires. Double-check that wires are fully seated and won’t vibrate loose.

Step 6: Replace the control board if testing showed it failed

If your multimeter confirmed the control board is dead, disconnect all wire terminals from the old board (photograph the layout first). Unbolt the board from its mounting bracket inside the furnace cabinet. Install the new board in the same orientation, reconnect all wires to their original terminals, and ensure no wires are pinched or touching the burner assembly. Secure the board with its mounting bolts.

Step 7: Reassemble and test the furnace for ignition

Close the furnace access panel and secure it with its screws. Restore 12V power at the breaker. Set your thermostat to heat and listen for the blower to start. Within 10 seconds, you should hear a spark click and smell gas igniting—the burner flame should appear steady and blue. If you hear clicking but no ignition, the igniter may still be bad; if there’s no spark at all, the control board replacement didn’t solve it and you need to recheck connections.

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