What is this boiler noise? Is it dangerous?

[Brimble]

In the last few days our boiler has started making a strange vibrating noise for about 10 seconds at a time every now and then (sometimes every few hours, sometimes more often). I’ve made a video – the vibrating noise begins on about 30 seconds:

https://drive.google.com/file/d/13ImAIxBVR8VJZD31OYnQfX2zzkKZdpF2/view

Not being qualified or competent with such things, I’ve done nothing myself other than a). bleed the radiators, and b). check the external pipe for obstructions, and I most certainly won't be doing anything else.

I’m assuming I need a boiler engineer, but a few quick questions:

1. Is it dangerous and/or urgent (to avoid damage)? In other words, while I’m waiting for the engineer, should I turn the boiler off or is it ok to keep on?

2. Should I ask for a service, or a repair? Is it likely that the service will remedy the problem?

3. Any idea what might be the cause?

Thanks in anticipation.

 

[ShaunCorbs]

Needs sorting but you can wait a day or two eg if the engineer is busy but needs sorting

Repair when was the last time you had a service?

the boiler sorry can’t say any more incase someone try’s a diy repair as it’s an open forum

 

[Scott_D]

is the pressure in the green zone?

 

[Brimble]

Yep, pressure is in green. It was about 1.5 bar, I bled the radiators bringing it down to pretty much zero, then brought it up to 1.0. Whatever the pressure is, it still vibrates. Sorry, I forgot to say, last service was just over 2 years ago - I know that's not ideal, just didn't get round to it last year.

I know you guy can't give too much detail in case it encourages someone to try an (illegal) DIY repair, but does it sound like it's like to be a very serious problem? Is it going to cost the earth to fix?

 

[Vee]

Wrong gas/air ratio can cause this when boiler is on low fire. Needs gas safe engineer.