HVAC Furnace Error Codes Lookup — All Major Brands

Is your furnace flashing a fault code? Find your brand below to decode what the LED pattern means, identify common causes, and get fix steps. We cover the five biggest North American HVAC brands plus their sister labels.

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Don't Know Your Code?

Use our symptom-based diagnostic tool to find the root cause by what your furnace is actually doing, not by error code.