Staff Answer
Sep 28, 2026 - 06:30 AM
If you've burned through several boards, something is shorting and taking them out. Before you install the fourth one, test the AC heater. It should show resistance across its leads and nothing (open) from either lead to the metal housing, because a heater shorted to ground is the most common board killer. Also check the gas valve coil and the electrode wire for shorts or chafing, and inspect the eyebrow cable. Find the short first, or the new board will fail too.
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