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how to find a fault?

my sister-in-law has a glow-worm 30c boiler the
central heatings ok but when they turn on dhw tap the water is hot then after a short time it goes cold and stays cold how do i fix this problem

trev
January 2014
Glow-WormHeating, Home Heating SystemsBoiler Central Dhw
could be dhw heat exchanger partially block

A1
January 2014

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