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We have recently had new radiators fitted, but one of them appears to be turning off too soon on the TRV. Its a Myson TRV with numbers 1 - 4, as well as white and blue dots.

We have the TRV set to the blue dot, but it goes off even though the room is still cold. Is this normal?

  • is the blue dot the coldest setting? is the problem that cranked all the way up, it's still too cold? if so, it's possible the trv is not snug enough against the valve to fully depress the little springy thing (not a plumber). – dandavis Nov 9 '17 at 5:46
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No you have a problem with the TRV. Somehow the wiring is mixed up. the room heater should stay warm until the room is comfortable. Maybe the TRV for that room is not connected properly. P.

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    The only "TRV" devices I've seen are purely mechanical devices - no wiring involved. – brhans Nov 9 '17 at 13:00

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