Hi, i have a gas fire with a back boiler , up untill yesterday it was working fine and heating our hot water . Today the hot water did not kick in and when we checked the pilot light it was not on , i then held the button in for 30 secs in clicked the ignition . When i released the button the pilot light would not stay on , i tried this sevral times but no luck , i held the pilot button in so it was on and my wife switched the heating on on and it still would not come on . We had the back boiler and fire serviced last year . Could anyone help as what may be the problem . Thank you