fireman, with respect:
you indicated earlier that no one had bothered to advise the OP to switch off because it was given as a minor matter. Not so: "turn it off. do not use it" by mysteryman, "you need to call back the fitter" by Agile, "essential for correct and safe operation" by 45yearsagasman.
These do not sound like "normal or ... common" acceptance of the situation.
you indicated earlier that no one had bothered to advise the OP to switch off because it was given as a minor matter. Not so: "turn it off. do not use it" by mysteryman, "you need to call back the fitter" by Agile, "essential for correct and safe operation" by 45yearsagasman.
These do not sound like "normal or ... common" acceptance of the situation.