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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

home Fix label Heating label_important Home Heating Systemsdone

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

Fix Fault - Heating

home label Heating label_important Home Heating Systems

Fix Fault - Heating

home label Heating label_important Home Heating Systems

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home Fix label Heating label_important Home Heating Systems

how can i fix my valiant ecomax 828e?

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how can i fix my valiant ecomax 828e?

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how can i fix my valiant ecomax 828e?

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