Good evening, Firstly, I am not knowledgeable in the complexities of plumbing and only have a grasp on common sense. My partner and I moved into her parents house after her mum died. There was no central heating so we had it fitted recently. The banging coming (I think) from the pipes is driving me mad. The boiler is in the kitchen. The bathroom is downstairs. And we have three rads upstairs. Even with nothing running, no washing machine on, no taps running and no toilet being flushed the pipes will bang. It is a horrible clanking noise. And is seemingly intermittent. It is loudest from in the bathroom. And from there it sounds like it is coming from the left, which is the kitchen and also where the cold water main valve is. (Hope I'm using the correct terminology). I contacted the guy who fitted the system who wasn't very interested but did come round. He went into the bathroom, flushed the toilet and turned on and off the taps but it did not happen. Typical. He then went into the kitchen and turned on the cold tap and said the pressure seems a little high, went into the cupboard where the main water valve is and turned it down. See how that goes he said. Within 10 minutes of leaving it was happening again. I contacted him again. He told me to check if there was any air in the upstairs rads. I did. There was a little bit of air in two out of the three rads. I bled them til water was present and checked all of the rads up and down. No air in any of them. The banging persists. I then did some reading and noticed the boiler pressure was set to about 1.9. After reading it generally should be around 1.0 to 1.5 and confirming that in the instruction manual I bled a rad until it dropped to 1.5 which it is currently. The banging persists. It's happening now as I type this. Nothing is calling for water other than the central heating being on. I recorded the noise on my phone and there were 5 bangs in a little over a minute. And I'm sure when i was in the kitchen I heard the boiler flame up and immediately after there was a bang. I also sat under the kitchen sink with my hand on the hot and cold pipes running along the kitchen and when the bang happened I certainly felt it. I don't know what to do next. The guy who installed it is not giving me much confidence and is not replying to me now. The pipework to the rads is new (as there was none prior, not having central heating) but the other pipework is probably the original pipework or at least old. Can anyone suggest anything I can try or check but please bear in mind I have no expertise at all in this area. Please. Please. Help us. We are having everything done to the house to make it perfect for us and spoiling it is this persistent and horrible clanking noise. Many kind regards A hopeful Andrew.