boiler not firing ?

hi
my regular conventional halstead hero 40 boiler wont fire up there is sometimes a dim light as if it is really trying to ignite. about 4 weeks ago i noticed that it was turning itself off, so i put in salamandar sludge remover about 3 weeks ago, and yesterday it wouldnt come on at all.
there is no heating or hot water and due to finances i wouldnt be able to get anyone to look at it till the end of the month and even then it would depend on the outlay.
i would be grateful for any information and advise given in the meantime.
cheers