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fire alarm guy

Hi folks. Can anyone please tell me why, when i flick circuit breaker to on for my storage heater timer, I get an annoying buzzing noise. There is nothing loose in the consumer unit.
 
Sometimes when you get a 'buzzing noise' coming from the breaker, it could be an indication that the breaker may be overloaded slightly.

What breaker is the storage heater on, and what is the power rating??
 
Ive had it on a lighting circuit(6 amp mcb) -loud vibrating/buzz. Im going to swap it out as i can only see a vibration as a cause of heat in future. The mcb was under hardly any load. Its a new fault to me so cant explain why....
 

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