Temperature inaccurate on TRV's
When the heating is off, The temp shown by the TRV's is pretty accurate and close to an independent thermostat placed close by. However when the heating is on and hot water is flowing to the radiator the temp shown is almost 3 degrees higher than what the independent thermostat shows. Its as if the heat from the pipes etc screws the temp reading.
I realise you can set an offset but when the heating off, this means the temp shown is much colder than what it is.
Has anyone else experienced this ?