We had an inservice from Fisher & Paykel tonight because we were having the same problem with "rain out." We learned that if the infant is on a radiant warmer then the temp probe must be covered with a reflective wrap. When an infant is in an isolette with an air temp less than 35 degrees C then the remote/ extension tubing must be removed from the setup, and the temp probe must be inside the bed and not be covered with anything (linen). Basically, the cannula must be connected directly to the temp probe port. When an infant is in an isolette with an air temp greater then 35 degrees C then the remote/ extension tubing must be in the setup and the temp probe must be outside the bed. Also check to make sure that the temp probes are completely inserted into the port and that no blue is showing.