Myson Apollo making strange noise - what could it be?

[deanparkr]

Tonight my Myson Apollo has started making a strange sound and has been on-going for hours. The boiler seems to be working fine otherwise. Its a really odd sound and I cant describe it in words so took a video as below:

https://mightytext.net/zwE75M

Just wondered if that sound might mean anything to anyone?

Is it something I need to attend to urgently in terms of getting an engineer out, or is it more likely to be a general issue?

 

[Dotty]

Yeah. You need an engineer.

I'm going to close the thread now before someone tells you what it is.