Hotpoint WD72 E15 code?

Bear with me! - Stopped with E15, check pipies. So I took black hose off, checked pump etc...all clear. also machine HAD emptied. cannot find blockage anywhere. Now the machine also does not take water in, goes through wash cycle with no water, then E15. Did some homework, and checked out water heater. - Open circuit. - so ordered/replaced new heater - fired it up - takes water in! - great I thought...goes through wash cycle - stops with an E15 again!!...now it wont take water in again...back to sqaure one. checked new heater... seems ok 26 ohms resisitance..old one open circuit. Checked new thermister agaist old one..both read the same... So what the hell can it be? and what controls the water ingress? HELLLP?