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This question already has an answer here:

I have a raster in .img format and i would trasform some values (Nan) into 0 with QGIS 2.14.3 (Windows). I've tried different ways but I didn't have results: 1- with raster --> conversion --> conversion format 2- operations with raster calculator (to replace non-zero values). With this operations, Nan values have been replaced by Nodata. After I have repeated the same operations but no data values haven't been replaced.

marked as duplicate by John Powell, ahmadhanb, underdark qgis Aug 4 '16 at 12:37

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you can try SextanteToolbox in QGIS:

Work Flow:

Analysis --> Sextante toolbox --> SAGA --> Grid Tools --> Reclassify Grid Values

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