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hot water switch and heating switch is faulty?

i have a combi boiler. if i just put the hot water on the hole central heating comes on. any ideas on how or what this could be? dave

dave
January 2011
D.I.Y, PlumbingBoiler Heating Plumbing
you didn't say which combi. sounds like diverter valve stuck.

de niro brasil.
January 2011
probably divertor valve stuck in h/ water position

brian
January 2011

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Combi Boiler: Hot Water Turns on Heating