crackling

Hi, I have a Scantronic Eaton 9943 LCD keypad which has recently started to make a crackling, electrical interference type noise (almost like a crackling internal speaker?). The noise is not constant and happens almost randomly with no rhyme or reason (i.e. not when setting/unsetting the...

I had a Baxi boiler fitted in February and when it is running it makes a weird crackling sound. I feel like it is in the pipes that exit and enter the top of boiler. It doesn’t always crackle, I think it is more when it is starting up. Is this normal? In every other respect the boiler seems to...