Web Reference: Aug 28, 2025 · This article explains what the 1DL code typically indicates, lists likely causes, provides a step-by-step troubleshooting checklist, safety guidance, estimated repair options and costs, and advice on prevention to minimize repeat occurrences. ★★★★★ 1 DL (I DL) and E 12 Furnace Error Code Fix - Thermostat is Dead, AC and Heat Pump Won't Run Jul 29, 2025 · What Does the Goodman Furnace 1DL Code Mean? The Goodman Furnace 1DL code stands for a “lockout” condition that occurs when the furnace fails to detect a proper ignition flame within a specific time frame.
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