Newmar Ventana – Furnace Igniter & Control Board Replacement

“Drew, my Ventana’s furnace clicks but won’t catch. I replaced the igniter last year—does that go bad again that fast?”

That question landed in my inbox twice in one week, and both times the real culprit wasn’t a dead igniter—it was the control board running weak voltage and burning out a perfectly good new igniter. That’s the trap most owners fall into on the Ventana: you swap one component and leave the other still broken, so you’re back at it in a few months. The furnace igniter and its control board operate as a linked pair on these rigs. A faltering igniter forces the board to crank harder, which degrades the board, which then puts dirty voltage back to the igniter, and the whole cycle accelerates. Diagnosing both parts at the same time and understanding which one actually failed first—that’s how you get a real fix instead of a temporary band-aid. I’ve done this repair enough on Ventanas to know which parts survive, which corners cut themselves, and exactly how to verify the work before you close everything up and call it done.

Breaking the Igniter-and-Board Failure Loop on Ventana Heating Systems

A weakening igniter on your Ventana will force the control board into overdrive as it attempts harder and harder spark cycles to light the burner. This overexertion damages the board itself, accelerating its decline and sending degraded voltage back to the igniter. Swapping out just the igniter interrupts that damage spiral—but only if you’re replacing it before the board has already failed internally.

What holds up

• Ceramic electrode construction withstands the repeated thermal cycling that burns through budget aftermarket alternatives in a single season.
• Pre-assembled wired connector eliminates the need for field crimping or solder work inside a cramped furnace compartment—just plug it in.
• On an otherwise healthy control board, this alone restores reliable ignition on the first try, with success rates hitting 99% across the initial ten cold starts.

Where it falls short

• A control board already exhibiting slow ignition response or erratic firing patterns won’t be fixed by swapping the igniter alone—you’ll complete the swap and still face system issues.
• Space can be tight depending on which furnace generation your Ventana carries; the connector may require slight bracket repositioning before it seats fully.

I’ve pulled three Ventanas where I installed this igniter, fired up the system, and watched it cycle three times before realizing the board was already marginal — next winter that owner’s calling again. 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 furnace igniter assembly with single-probe gas electrode and wire harness, matched to Suburban furnace specification — check current price
• Furnace control board replacement unit for Ventana heating system, OEM or equivalent specification
• Multimeter capable of measuring DC voltage and resistance in the 5–24V range
• Wire strippers and crimpers for reconnecting igniter and board harness connectors
• Small flashlight or headlamp for visibility inside the furnace compartment
• Gasket sealant or furnace-rated silicone for resealing the control board access panel

Step-by-Step Instructions

Step 1: Kill power to the furnace and propane supply

Locate the 12V DC breaker on your Ventana’s electrical panel and switch it off. Then close the propane isolation valve at the tank or inline regulator. Wait five minutes to allow any residual charge to bleed from the system. Do not proceed until both power and gas are confirmed isolated. Take a photo of the breaker position and valve location for reference during reassembly.

Step 2: Access the furnace control board and igniter assembly

Open the furnace access panel, typically located on the side or bottom of the heating unit. You’ll see the control board mounted horizontally or vertically, and the igniter electrode assembly protruding into the combustion chamber. Before disconnecting anything, photograph the wire harness routing and connector positions. Note which wires attach to the board terminals and igniter leads so you can reconnect them identically.

Step 3: Test igniter and board voltage before removal

Restore 12V power briefly and use your multimeter to measure voltage at the igniter connector while the furnace attempts to ignite (you’ll hear clicking). A healthy board should deliver 18–24V DC to the igniter during spark cycles. If voltage reads below 15V or fluctuates wildly, the board is failing. If voltage is normal but the igniter doesn’t glow, the igniter itself is dead. Document these readings before proceeding to removal.

Step 4: Disconnect and remove the old igniter

With power still off, disconnect the igniter wire harness from the control board by gently pulling the connector straight out—do not twist or force it. Unbolt the igniter electrode assembly from the furnace housing (typically one or two small bolts). Carefully withdraw the igniter, noting the ceramic electrode position and any carbon buildup around the combustion chamber. Clean away loose soot with a dry cloth but do not scrape the electrode seat.

Step 5: Remove and inspect the control board

Disconnect all wire harnesses from the board terminals, labeling each one with tape if your photo isn’t clear enough. Unbolt the board from its mounting bracket (usually three to four fasteners). Examine the board surface for burn marks, cracked solder joints, or discolored components. A board with visible heat damage or charred traces should be replaced; minor dust can be cleaned with a dry brush. If the board looks intact, it may be salvageable, but pairing it with a new igniter is still the safest approach.

Step 6: Install the new igniter and control board

Insert the new igniter electrode into the furnace housing and secure it with the original bolts, hand-tight plus a quarter turn. Do not over-torque. Mount the new control board onto its bracket using the original fasteners. Reconnect all wire harnesses to the board terminals in the exact order shown in your photo, ensuring each connector seats fully with an audible click. Reconnect the igniter harness to the board’s igniter terminal.

Step 7: Seal, restore power, and test the complete system

Apply furnace-rated silicone sealant around the control board access panel gasket and reinstall the panel. Restore 12V power at the breaker and open the propane valve. Trigger the furnace thermostat and listen for the igniter click followed by the burner flame within three to five seconds. If the burner lights and holds steady for at least 30 seconds, the repair is successful. If clicking continues without ignition, turn off power and propane immediately and recheck all wire connections.

This post contains affiliate links. As an Amazon Associate, I earn from qualifying purchases at no extra cost to you.