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Checked FAQ for refilling a CH system but appears to refer to a pressurized system. Drained the CH system to refit a new TRV. Do I need to replace the existing olives on the pipe work or can I get away with fitting the new valve to the old pipe-work connections providing I don't over-tighten...

Dear DIYnot.com, I have a strange situation where one of the downstairs radiators on my CHS doesn't always work. Sometimes it remains cold sometimes luke warm and then sometimes hot. I've noticed that if I turned the CHS off for 20 mins and then turn it on again the radiator seems to work...