Don't come accross these that often but today I have one that is buzzing a bit and is warm (compared to it's neighbouring mcb's) but not hot. It appears as though it is the control input that is causing the noise and heat as I am able to turn the loads off. It is a Hagar ES240.
Does this need to be replaced or is it fairly normal for a 10 year old unit?
Does this need to be replaced or is it fairly normal for a 10 year old unit?