Hello,
Over the last month the valve in the pic has started to make a buzzing noise and getting hot on the side where the black cable goes in. The noise is now quite loud and can be heard at night.
This valve is for hot water or hot water and radiator. I'm not sure why as i can only have the hot water radiator as the gap for hot water on own is blocked by a metal plate. I was told this is a basic system (???) so we use the immersion in the summer for HW.
Anyone know what this buzzing is? The noise/buzzing is all the time even with the central heating off. A bit concerned how hot the meatal plate is too.
Many thanks!