Woke up freezing this morning and realised radiators are stone cold. Looked on the timer and the red light was on so checked boiler and the light is blue. Found booklet which says if boiler light is red then its on and if flashing blue then there is a fault but this isnt flashing. Boiler is definitely off. Making no sound. Have gone through the reset and nothing still. Have chcked fuseboard and power hasnt tripped either. Could be hours till enginerr arrives. Any bright ideas?? Im freezing!