My Ariston microgenus 27 MFFI, gets into a mode where it turns on burner until all yellow leds are lit (80') before it turns burner off. At this point I can hear the water boiler inside. It does this even though the CH is off and no hot water is being drawn. Only way to stop it is turn the on/off dial to off. I can leave it off overnight and when switched on goes straight into 'burn' mode again. Its been doing this for a while, and I used to be able to get it back to normal by running the hot tap with boiler switched off, so cold water ran through the boiler. Any ideas where the problem is? (i'm thinking one of the two thermostats ...)

zebrob, July 2006

I posted this problem myself a while ago - well the problem turned out to be over pressure in the water system. When I drained to decorate, reset the pressure so it was just out of the blue minimum section when system cold, (pressure increases when system is running). Have not had problem since.

zebrob, September 2007