What does fault code 41 mean on a furnace?

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During this sequence, it is possible for furnace control board to start flashing Fault Code 41 instead of Fault Code 44. This indicates that blower calibration failed and blower speed during off delay is out of range. high-heat blower RPM is greater than 1300 RPM, and unit remains running in low fire-mode for rest of heating cycle.

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