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I need to change some leaking valves and fit another radiator to the system. How long can I safely leave the boiler off and drained before there's an issue with the pump? It purges everyday at roughly the same time, but I doubt I'd get all the work done before it's next purge. It was left switched off at the mains for a couple of weeks once and it certainly didn't like it when it was switched back on, it ran the heating at full blast and wouldn't respond to any attempts to switch it off, had to switch off at the mains and it eventually behaved itself.
