New rads were fitted many months ago with new TRVs from screwfix. 5 in total. All were simply left fully open with no issues (number 5) but as the new kitchen tends to be a bit warmer I turned the TRVs on the 2 big kitchen rads down to 4. I then noticed a hissing sound at some points when the heating was on.
This is cured by moving the TRV setting slightly up or down. But then next time the heating comes on, the hissing is back. I just move the TRV setting slightly to cure again. Not really up for this daily routine. Still happens now if I leave them fully open on setting 5
The other rads where I haven’t moved the TRVs are fine. Why is this happening? I can merely guess in my limited knowledge they are starting to operate and shutting down a bit restricting the flow? Seems strange as the house is only about 21 degrees. Why does this happen now I’ve fiddled with them and didn’t before?
What’s the fix? New head? Please tell me not new valve!
This is cured by moving the TRV setting slightly up or down. But then next time the heating comes on, the hissing is back. I just move the TRV setting slightly to cure again. Not really up for this daily routine. Still happens now if I leave them fully open on setting 5
The other rads where I haven’t moved the TRVs are fine. Why is this happening? I can merely guess in my limited knowledge they are starting to operate and shutting down a bit restricting the flow? Seems strange as the house is only about 21 degrees. Why does this happen now I’ve fiddled with them and didn’t before?
What’s the fix? New head? Please tell me not new valve!