Web Reference: ★★★★★ 1 DL (I DL) and E 12 Furnace Error Code Fix - Thermostat is Dead, AC and Heat Pump Won't Run Sep 18, 2025 · This article explains what the 1DL code means, common causes, step-by-step troubleshooting, safety precautions, and when to call a professional. It also includes diagnostic tips to help resolve the issue efficiently and protect the heating system. Nov 1, 2023 · If you see the 1DL code on your Goodman furnace, it is important to have it fixed as soon as possible. A malfunctioning low-voltage transformer can prevent your furnace from working properly, leading to uncomfortable temperatures in your home.
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