vokera 24 combi works fine but sometimes when auto clock cuts off timer the boiler carries on running and then stops and then starts again.Any ideas??

darren Benson, February 2007

Please ignore my answer- it was wrong .. just checked the manual, (this model has a motorised diverter valve driven by the microswitch operation).

cd, February 2007

Maybe an intermittent fault on hot water microswitch? (boiler thinks that there is hot water demand, but diverter valve is in central heasting demand position, so radiators get/stay hot).

Does turning down the domestic hot water temperature (on the boiler controls when it is fired up wrongly) turn down the flame, or does turning down the central heating temperature modulate the flame during this condition?.

If the first case then it may be the microswitch, if the second maybe the timer itself is faulty?.

cd, February 2007

change primary thermistor

mr gas, February 2007