I have 18month old new central heating system with valiant boiler and gledhill hot water cylinder. Recently I have been getting a loud humming and vibrating noise that seems to occur only when the hot water is being heated but the heating is off...
Although there was a time it only happened in the morning now for the last week it has been happening in the early evening.
My hot water heats in the morning from 6 to 9 and then restarts heating at 4pm... It seems by 6pm the noise starts every time the thermostat turns the central heating off... The noise stops as soon as I put the central heating back on..or once the hot water stops heating at 7pm...Any ideas ? ?.
Although there was a time it only happened in the morning now for the last week it has been happening in the early evening.
My hot water heats in the morning from 6 to 9 and then restarts heating at 4pm... It seems by 6pm the noise starts every time the thermostat turns the central heating off... The noise stops as soon as I put the central heating back on..or once the hot water stops heating at 7pm...Any ideas ? ?.