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my vokera xl 80 sp?

the hot water keeps going hot and cold, already changed the thermister
ralph, August 2007
Hot water not getting very hot central heating ok

Brian, March 2015
google 'vokera flue venturi cycling'
Differential air pressure switch cutting out, cause: dirty venturi, fan and HE. Cure: proper Vokera service.

c, August 2007
link Click here to see other fixes for Vokera.