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hot water failing but central heating ok?

My britony se80 combi boiler has a fault

my central heating works fine but I can't get any hot water without putting my central heating on,

The gas jets fire up fine on central heating but no flames when calling for hot water
ChrisR, September 2011
Sounds like the diverter valve is sticking

bill, September 2011
Also prior to hot water not working central heating pump used to come on when running hot water

ChrisR, September 2011
link Click here to see other fixes for Britony.