Goodman Furnace 1dL Code: What It Means & How to Fix No Heat
Video summary
The Goodman furnace 1dL (or IDL) code means Idle — the furnace has power and is waiting for a thermostat call. If you have no heat or a blank thermostat, common causes are a blown 5‑amp control board fuse, damaged low‑voltage thermostat wiring, or an open door safety switch. Fixes include checking power, replacing the 5‑amp fuse, inspecting thermostat wiring and the door switch, and resetting power. Stop replacing fuses if they blow immediately and call a technician for wiring shorts or burned components.
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