KEYSTONE BULLET 287QBS – Furnace Igniter Replacement

A dealer quoted me $340 in labor alone to swap a furnace igniter on a Keystone Bullet 287QBS—that’s before the $85 part cost and the two-week service backlog. I pulled the component myself in under an hour, realized the job was straightforward enough that I’d never pay that markup again, and decided to map out exactly how to do it right the first time. The real problem with this repair isn’t the difficulty; it’s that when your furnace quits mid-season, you don’t know if you’re chasing a dead board, a bad igniter, a fuel delivery problem, or something else entirely. On the 287QBS specifically, the igniter fails quietly—your thermostat keeps calling for heat, the blower runs, propane flows into the chamber, but nothing ignites. You get warmth from nowhere, the system locks itself out after a few failed attempts, and suddenly you’re sleeping under every blanket in the trailer at 38 degrees while everything tells you the furnace should be working fine. I’ve sat through exactly this scenario. I’ve also rebuilt this same furnace three times across different rigs. This is what actually fixes it—without the guesswork.

The Ignition Board That Sparks Consistently on Demand

The board inside your 287QBS furnace is responsible for commanding the igniter to spark—when this circuit board deteriorates, spark stops but gas keeps flowing, creating the illusion of a full system failure when really just one $15 component is done. This OEM-spec replacement is the fix that eliminates all the diagnostic second-guessing.

What performs reliably

• Drops straight into place with zero rewiring—the factory Suburban board mount accepts this part without modification, connector clips line up, and you’re done.
• Ignition fires on the first demand cycle instead of the stuttering three-click pattern that tells you the original board is approaching failure.
• The 12VDC circuit design matches every SF-series furnace from 2015 through 2022 production, so cross-model compatibility stays reliable across that entire build window.

What falls short

• Standard shipping takes 3–5 days minimum, which means if your furnace dies at midnight, you’re spending that full night in an unheated trailer—overnight delivery options don’t exist for this specific part.
• Connector polarity reversal (usually from third-party sellers mixing inventory batches) will fry a new board the moment you apply power—always trace your original connector pins before installing to avoid a second failed 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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