Hi,Welcome to Just Answer, My name is Bryan,I look forward to helping you today.
can you tell me if the lights flash a certain amount of times then repeats ? like 7 times then repeats?
okay good. remove the access panel under the door and shut the breaker off at the box,
you want to isolate the heater by unplugging one of the terminals, then test it like shown in this video. click this blue link. http://www.repairclinic.com/PartDetail/Heating-Element-Assembly/W10134009/1381534?modelNumber=GU2500XTPS7 let me know if it tests good.