smeg dishwasher dwf614ss not washing

Hi all! I've a problem with dishwasher. Tried all cycles, it will drain water out, it will heat water, it releases the tablet but wont run by which i mean circulate water or spin the water rotor arms. Do see an E3 code indicating not heating but it is heating. After its started heating the water it gurgles and bubbles but doesn't run. Nothing obvious like blockage so wondered what and how to test stuff or find/test any sensors. No water underneath, float/flood valve clicks. It might be the main pump motor but I cant see it;s under heavy loads so would have thought they went forever. It's 9 years old and yes I could get an engineer out but was hoping to fix it myself. The pump out is noisy and maybe warn but still works. If anyone knowledgeable in this department can advise or suggest it would be appreciated. Many Thanks, Mark

 

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