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boiler lost hot water?

my glowworm combi has got no hot water? does anyone know whet the problem would be please?
Sarah, September 2013
is the water luke warm. is it hot when running slow. if so then the heat exchanger is clogged up. will need replacing or cleaning. also i would check the flow switch for the hot water if there is not any hot water.

kash, September 2013