hiya im have a covatutto and it doesnt flash on and off "blink" it heats up to 37.5 , reading taken from 2 thermometers inside the incubator , It switches off when at 100.f and comes back on as it drops below , so its doing what it should stat wise but it is not flashing at all , it has been running for 3 days with a temp between 37.5-37.9 , im not sure wether to use it still or not bother as i know it is supposed to flash !!!! cheers