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Hot radiators but no hot water.

Postby straydog » Sun Jan 04, 2009 11:52 pm

I have a Ferroli Optima Combi Boiler which is heating the radiators as it should. When I turn on the hot water tap the boiler seems to be heating the water (i.e. the flame comes up as it should) but there is no hot water coming thru????

This system does not have a header tank.

Any ideas?
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Simply Build It

Postby gasmick » Mon Jan 05, 2009 8:47 pm

hi it sounds like the domestic heat exchanger is blocked other than that it could be the diaphram on the domestic diverter valve but i think its the heat exchanger
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