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we had a new central heating system installed in June 2017.we noticed that one of the bedroom radiators keeps cutting out.we called the engineer out who lubricated the pins and it come on.if you turn the TRV thermostat on and off it does that but soon goes off again.we called the engineer back out who replaced the TRV thermostat.it is still doing it.the pipe leading to it is hot but something is stopping it going through.this engineer explained how the valve works and it got me thinking.this radiator is the only one that is behind a door.could that be the problem?is the TRV thinking it is warm enough.