Staff Answer
Sep 27, 2026 - 06:20 PM
If the 5 amp fuse blows on both LP and AC, something on the 12V side is shorted. Unplug the 12V loads from the board one at a time (igniter, gas valve, fans, interior light) and put in a new fuse after each one. If the fuse holds after you unplug something, that part or its wiring is the problem. If it still blows with everything unplugged, the board itself is shorted, and the 637082 power board is in stock for the 2118.
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