Pressure fall in Glowworm Boiler heating


Recently I moved to a house fitted with a Glow-worm Xtrafast 120 Combination Boiler. There is a small central heating water leak causing a pressure fall. I need to detach the half inch pipe at an upstairs radiator and remove and replace the olive. I suspect the olive is trapped slightly beyond the end of the pipe. Is it feasible to close the radiator valves at both ends, switch off the power supply to the boiler, shut off the cold water supply and drain downstairs until the pipe leading to the radiator is empty? Would I need to relieve the water pressure and how? What else would I need to do before I restart the system? My previous home had a traditional hot water/heating system. I would be extremely grateful for any advice for solving this problem.
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There is no need to turn off the cold water supply when draining a combi. All you need to do is OPEN both sides of the radiator you want to work on and drain the water from the CH system. If you are working upstairs then you only need to drain the top half of the system. Put some inhibitor in before you refill the system and after bleeding the air out the job is done.
Adam
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Many thanks for the reply Adam. I'll do it the way you suggest.
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