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After looking at my TRVs I seem to have two types First TRV doesn't have arrows in both directions - see two pics below: Top of TRV 1 https://www.dropbox.com/s/3ld1h2qxojo0u4n/2020-12-22 16.48.47.jpg?raw=1 Side of TRV1 https://www.dropbox.com/s/znp39ejtmvtk2ww/2020-12-22 16.48.39.jpg?raw=1...

Thanks - good idea. Will post a pic of TRV when I get home.

Banging at the radiators and in the pipes when the boiler cycles very 10 minutes. Checked TRVs - arrows going in both directions. They didn't change the rads or TRVs. They did perform Powerflush.

Thanks - you are right. Boiler was short cycling. Have got them back and they changed power setting and increased pump speed but that hasn't done very much. I have asked them to come back but confidence in my plumbers is not the highest right now.

Looks like I've opened up a can of worms with my post. But you are right - I wouldn't get the same guys to do the work again although they did have the all the credentials. So can anything be done to resolve my issue or do I just live with it?

I'm hoping someone can help. I don't know much about central heating systems. I've just installed a new boiler (Vaillant Ecotec 637) and new hot water cylinder. Previous system was vented whilst the new system is unvented. Problem I have is when the boiler cycles to heat the radiators I hear...