Tue 14 Feb 2017 12:20pm
I've recently discovered fairly loud Fizzing/Buzzing noise coming from the consumer unit ONLY when the electric shower is on. The shower is about 16 years old, 7.5 or 8.5 kW power rating. Consumer box is in hallway, inside a cabinet, so couldn't hear noise with cabinet doors closed. No other noises or issues with electrics in house, no burning smell or marks around consumer unit, no melted bits. Is this noise normal?