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If the valve is vibrating (buzzing) this is most likely because it is on the out-flow side of the radiator rather than the in-flow side, and it is a non-reversible valve body. This problem might have been apparent before you fitted the Heat Genius valve heads, because your old TRVs were not closing the radiators down properly. This is because the wax in traditional TRVs ages and no longer works properly, leaving the valve open.

The vibrating happens because the flow of water should be coming in under the valve when it is on the 'inflow' side of the radiator, and this pushes the valve pin up against the electronic head. When it is orientated incorrectly the flow is over the top of the valve and there is nothing to stop it closing completely apart from a small spring inside the valve body. Because of this the valve opens and closes at very high speed causing the valve to vibrate and make the noise you can hear.

There are several possible solutions to this:

  • If the valve bodies are the Danfoss RA-FS type they have a small grey cap which can be rotated 90 degrees and this swaps the flow from under the valve to over the valve, and stops the valve from vibrating.
  • If the valve body is another type, you can (as a temporary measure) turn down the lock shield which is at the other end of the radiator. This reduces the effectiveness of the radiator and reduces its ability to heat the room, but it may stop the valve from vibrating because there is less water flowing through the radiator.
  • An alternative would be to swap the ends of the radiator over so that the valve body is on the correct (in-flow) end of the radiator.
 

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