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Thank you for your help. All the radiators get equally hot when they are fully on. I have checked on which side of the rads the TRVs are on. I found that 3 of them are on the return side, the rest are in the flow side. As far as I can tell the 3 on the return side create the noise. A slight...

Thank you. The installer did come back and said it could be a TRV valve. He took one of the valves off and asked me to run it like that the next day and see what happens. I also have to leave the bathroom on off valve on permanently. I did this and had another couple of rads on 2. This did not...

I have had a new Vaillant combiboiler Ecotec 838 fitted together with new copper central heating pipework. The whole system is new. It works well except for a noise like a motor coming from the system from time to time for about 10 minutes and then stops. It is difficult to say where the source...