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If you fill the water jacket of your 3100 series Thermo Forma incubator (might fit 4100 series, not sure) and you STILL have the "ADD WATER" error, it may very well be that this float sensor is broken (we've seen it happen).
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.