I usually just add water to the incubator as it gets low from evaporation...and I usually try to put lukewarm water in so it wont affect the temp drastically either way
I just checked on it and the temp and humidity are ok but it's starting to smell, I looked at the eggs, and from what I can see nothing seems abnormal except for the smell..Would it be alright to take the bins out, change the water and do a quick check of all the eggs in case I'm missing something ???
You really should keep your incubators as clean as possible. I use distilled or RO water in mine. I completely decon. and dry out when not in use. Good luck!