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how can i fix my valiant ecomax 828e?

my central heating works but when i turn on the bath hotwater tap the boiler shuts down and E12 is displayed as the fault this code is repersented in the manual as unit blocked
abe, January 2006
hi,
sounds like the diverter valve or maybe the domestic heat exchanger. needs a boiler engineer sorry not easy to do yourself

graham, January 2006