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Changing a hot taps washer on a combi system?

I need to change the washer on a sink tap (hot) in my bathroom. The system is a combi boiler, is it as simple as just turning the boiler off, or should I turn of the main as well?

Gary
May 2006
you must turn off the cold water main and the boiler

steve @active plumbing
May 2006

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