how to fix my vokera mynute 14e?

i have recently moved house and now have a 14e boiler that is not working. I can hear the fan, but its not firing up the bolier. The pressure was too hign so this has been released. The rads came on slightly this morning, but nothing since. I have reset the programmer etc. Any ideas for a non technical lady? Plumber tried too. Need hot water please.