I am sorry it has taken a while to get back to you.
The error code you say that is showing , responds to the burner ignition not operating.
Please can you look at the water pressure on the boiler. If it is below 1 bar this maybe the problem. The pressure should be between 1 and 1.5 bar.
If the pressure is low there should be a tap under the boiler to let in more water to the system. If you try this and let me know what happens, then come back .