The radiator that is furthest from my boiler struggles to heat up to the temperatures of the other radiators. I use an infrared thermometer to measure the temperatures and it is consistently 10 degrees cooler than the others.
The flow pipe is fitted with a two-way TRV. As I type the room thermostat is calling for heat, the boiler is on, the flow pipe on this radiator is 55 degrees Celcius, while the hottest part of the radiator is 44 degrees C. The TRV is set to 5, its highest setting. The lockshield valve is fully open.
Is this symptomatic of a blocked TRV?