Is it worth repairing?

My Indesit Wie167 keeps showing error code H20 I have turned the machine off completely but it makes no difference, however the machine is filling but through the pre wash chanel only, therefore not taking any powder down into the drum. I have to press the start button two or three times until there is enough water in the drum before it will start a wash, It seems to be heating the water though. Would much appreciate any idea of the problem and possible cost of repair.