hi all..i have a vokera 80E combi and the problem started last night with radiators getting red hot well over 60 centegrade,i usualy keep it set at 35 c at the boiler, i don't use a room thermostat.i turned the ch knob down to zero,but it's still goes over 60c, and also the ch is running on dhw mode..could this be a thermostat problem,and why is the ch running in the dhw mode aswell...Thanks.