During re-warming it was noted by the Perfusionist that the Heater/Cooler was not working and that the Perfusionist was unable to re-warm the patient. Another Perfusionist was called into theatre to swap out the defective device. The issue was diagnosed as a pump failure as there was no flow of water through the device. During the changeover of the Heater/Coolers, a kink in the water line was noticed and identified as the cause of the problem with the originalHeater/Cooler. The device was then reconnected to the oxygenator and to the cardioplegia heat exchanger. However, one of the cardioplegia heat exchanger lines was not attached and when the Heater/Cooler pumps were turned back on,water from the Heater/Cooler sprayed into the sterile field contaminating the wound, instruments and staff.