Update of Vaillant VCW GB 282 EH fault?

The above Boiler last night for some reason stopped working, due to its age theres only 1 power light on the front which had gone off, so i checked the 3 fuses in the front, as i pulled 1 out the light came back on but boiler still didn't work, i assume this is some kind of fail safe just need to know whats failed..
Update : ok, of the 3 fuses on the front panel, the T2a one has blown on the far left, i replaced it and the power was back, I tried the water, it instantly blew again, I have also checked that the pump runs freely and it does, anybody help please....