Hi,Welcome to Just Answer, My name is XXXXX XXXXX forward to helping you today.
can you tell us the make and model # ?
sERIAL NO. HLU3949099
Mod # XXXXX XXXXX
Item #906492 (OEM Part)
Water temperature sensor, the machine wont run if this is faulty. you need to order and replace it, heres a link to order the part. http://www.repairclinic.com/PartDetail/Thermistor/8181705/906492 its # XXXXX on this diagram.