Old Boiler making a chirping noise - what does it mean?

NoIdeaWhattoPut

I have an old Ideal WLX CF40 boiler. It probably should have been replaced years ago but following ill health and redundancy I have not managed to do it. But it has always been reliable.

Now there is a chirping sound coming from the boiler and I have no idea what it means.

Can anyone tell me what this means? Is it safe to run the boiler?

MP1995

It is telling you to get a gas safe certified person in or if you fancy it a youtube search but really get a professional in to check it over and service it if that's not been done.

Ectophile

Could it be a carbon monoxide sensor mounted close to the boiler?  If so, that could be chirping because the battery has gone flat.

If so, you probably need a new detector.  Even on the ones with replaceable batteries, the detector often reaches its expiry date before the batteries go flat.