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hot water?

I have vokera option combi boiler hot water adjustment is on full position, low warm water is comming, but not hot water,any one can help me ,thanks.
sajoo, January 2013
blocked heat exchanger. this become scaled in combo boilers. it will need cleaning or replacing

kash, January 2013
If HW is at normal flow rate, suspect thermistor for HW temp in boiler,

SD, January 2013
link Click here to see other fixes for Vokera.