My Ariston Genus combi is continually heating the rads, and reading a water temperature of 70, when it normally only goes up to 40. Hot water is still heating normally, and to the normal heat. The bar pressure is within the recommended range. The boiler is set to 'summer', ie there should be no ch operating. The only way I can stop this happening is to turn the boiler off with the mains switch. I have done this to reset and turned it back on again, but the same thing happened.
Any ideas, anyone
Any ideas, anyone