Hi.have you checked the water isn't coming out of safety valve
What is your pressure gauge reading?
Hi , I'm sorry to say but you definitely have a leak from somewhere as you are loodsing water. Don't try to run the boiler without water . dobyou mind if I ask if you know where the safety valve exits. Is it on the outside wall of where the boiler is sited? Do you have one sited somewhere else?. I have sent them in lofts before.
Hi , was your answer sufficient? Or do you require further help?