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vokera 80 sp combi boiler?

when heating is switched off ,on the boiler and the stat is off no hot water taps are open,boiler fires up by its self . this causes it to over heat and switch its self off.When heating is on everything ok,hot water ok too.
angela, May 2008
a slow dripping tap will cause this (or a small leak on the dhw anywhere from the boiler to a tap)

T, May 2008
broken dhw microswitch?
c

c, May 2008
link Click here to see other fixes for Vokera 80 SP.