Glowworm 30cxi not repressurising

If you have an outside tap ,hose pipe, and a drain cock on a radiator or somewhere else on the central heating system ,you can pressurise the system to at least get your heating on .
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The other end of the blue handled valve is a fill valve, it will be stuck, they are totally useless , best to get an external filling loop fitted, as @terryplumb says you can top up with an outside tap as a temp measure
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