Can you confirm the gas is still on?
Has anything been turned off under the boiler?
ok, do you have the full model details?
25c, ok is there anything else written on the boiler?
ok, it could be anything to do with the gas, or anything to do with the ignition.
It is failing to light.
With it only being in for 4 weeks the manufacturer will come out free of charge tomorrow if you ring them in the morning, but without a multimeter and standing in front of it there is not much else i can do.
It could be a loose connection inside the boiler preventing it sparking, or it could be a faulty part
Did you get this sorted?
No problem, it will be interesting to find out the problem
Was he an expert?
Did he check the gas pressure to the gas valve or the burner?