indesit wd125

i posted on this site a while back with my problem and i though id fixed it but it again has occured.

i had error of 15 flashes which i was told was the dryer heating element which i presumed it could not be as the dryer was not switched on and the error occured during the wash cyle.

i watched the washing maching as it did its cycle and noticed it was occuring on the drain and watched the water going down the sink and outside into the drain…which was blocked….so i cleared it and it worked 🙂 fantastic i thought… untill today 🙁

it has worked for about 4 loads
today it is showing the same error 15 flashes and it stops on its first drain, but this time it attually goes down the drain….but then it stops and clicks round and sounds as if it still trying to drain…any ideas?