BVF629b just bleeps and does not start

Hi gents select programme on bvf620 dishwasher press start and its bleeps once at me so fitted new pcb worked fine untill it dispenser opened then it blow new pcb solnoid on down to earth fitted new pcb and dispenser last 1 week now its come back in as select programme machine bleeps nothing happens any ideas would help me as i dont want to give up and refund the customer