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Thank you Madrab - I've taken off the TVR head and no noise as of yet, which is very promising. I've been on YouTube looking at vids of diverter issues with Vailant boilers and the noises are very similar to what I'm hearing with mine. If it does happen to be that, is this still safe to use...

Ah - for a complete novice do you have any suggestions on how to fix this issue? As it only started right after the new rad was fitted (not the one in the vid either)

Hello, We just had a new radiator fitted in our front room, no issues with noise at all beforehand. The day after it was fitted we started getting a really loud horn type noise out of one specific radiator (not the new one) it can get pretty loud and it seems the only way to get the noise to...