Calling for heat on xv90 the lite flashes green 20 times and once flashes red this is done over and over for a peroid of time. Then I guess it tries to start igniting 2 green flases and after 2 red flashes so 2 green and 2 red flashes repeatedly. Is this problem pointing towards his probe or what could it be ?

Have you checked out the components with a meter? Until you do this you will not be able to know anything. DrTom4444