Hello - I have just moved into a new house with the above boiler. When the central heating is running, the boiler fires up every 20 seconds for about 10 seconds - a continuous pattern of this. The pressure gauge is fine - at 1.5 bar when the heating is switched off, and going up to just about 2 bar when running. Is it normal for the boiler to continuously fire up as described above? I'm just concerned because it almost seems like the safety valve (?) is clicking on as it would do if the pressure bar was climbing over 3. As you can probably tell, my knowledge is pretty much non-existent, but I hate messing with gas and if something appears to be wrong then I will switch it off and have an engineer out asap.