KEYSTONE BULLET 287QBS – Furnace Igniter Replacement

I taught myself to handle most RV repairs through a combination of YouTube videos, forum threads, and expensive mistakes. The expensive mistakes were the best teachers. This guide covers what I eventually figured out — without the part where you strip a bolt, order the wrong component, and wait a week for the right one to arrive. On the Keystone Bullet 287QBS, a failed furnace igniter isn’t a minor inconvenience — it means waking up to a 38-degree interior at 2 a.m. while your propane runs fine and your thermostat lies to your face, clicking away like everything is normal. The furnace tries to light, fails silently, and locks out, and if you don’t know what you’re looking for, you’ll chase ghost problems for days before landing on a $15 part that takes 45 minutes to swap. I’ve done this repair, I’ve documented every step on the actual unit, and I’m writing it the way I wish someone had written it for me.

The Control Board That Actually Fires on the First Cold Start

On a 287QBS, the ignition circuit board is what tells the igniter to spark—when it fails, you get propane flowing but no flame, which feels like a total furnace failure until you realize the gas is doing its job and the board isn’t. This is the OEM-equivalent replacement that ends the guessing game.

What works

• Direct 1:1 swap with the factory Suburban board—no adapter wiring, no bridging circuits, just pull the old one and seat the new one flat against the furnace housing.
• Ignition fires consistently on first demand instead of the three-click-and-hold stuttering that signals a dying board reaching end of life.
• The 12VDC logic is identical across the SF-series lineup, so you’re not gambling on cross-compatibility if your rig is a 2015–2022 production run.

What doesn’t

• Amazon logistics means 3–5 days minimum, and if you’re ordering at 10 p.m. on a Tuesday night with the furnace dead, you’re camping in a cold rig that full night—there’s no expedited option that keeps you warm.
• Some sellers mix batches; verify the connector pin layout matches your furnace before installation—a reversed polarity connection will blow the new board instantly and waste another 5-day cycle.

I second-guessed the board swap the first time because the furnace fan was running and propane was flowing—it felt like everything should work—but the board was barely holding a 4.5V signal instead of the steady 12V the igniter needed. Order the Lrichy OEM 520820 RV Furnace Ignition Circuit Board for Suburban SA/SF/SFV/SH/NT Furnaces, 12VDC Control Module for SF 20/25/30/35/42, NT 12/16/20/24/30/34, 521099 520741 520871

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