female in need sime friendly boiler?

A plumber recently fixed my mix shower and a leaking tap. Since the repair has been done i have no hot water. I have tried turning the DHW tap but there was no sound of water to fix the presssure of the bolier. The boiler makes a rumbling noise and a click sound when i run water fom the hot water tap. However no hot water is produced. I have read the manual and attempted to light the pilot light but nothing happens when i follow the instructions. I therefore do not know if the problem is actually the pilot lght. I am puzzled as to what the cause could be?? Can anyone help me with this? The pressure is between 1 to 2 bars with the red dial (hand). The grey dial (hand) is more (about 4 bar). I have looked through the window (gap to see pilot light) and there was no light when turning a hot water tap on. I have tried turning the mains tap to change the water pressure. I have also tried to turn the two DHW tap in different combinations, but nothing happens. I have tried turning the electric supply off and on and tried to ignite the flame useing the H push in button but nothin happens.

The plumber that fixed the other issues has now gone to Turkey on holiday for a week and i have no hot water for this time. I do not want to be charged alot of money by a new plumber for something that is easily fixable just because i am female and live on my own.

If someone could instruct me on how to fix this problem, i would really appreciate it as i am not stupid, i am just not an expert on boilers.

Please !