Hi Ceolmor
I'm guessing you have a Scientific Sales thing sold by DirectOnline (I think)
A quick google indicates it might be one of the later ones, ie a one piece integrated sensor array,
a white frame with black wind sensors & rain bucket top, going by their online pix.
If that matches then I suggest you get back to the supplier to seek help.
If it's actually an older system with separate plug in sensors, then there are quite a few things you should check to try to sort it out.
Welcome to the forum by the way
Cheers