Noisy Boiler

[DIYimpaired]

Help please. Our Chaffetaux Sterling FF is making a terrible noise, but only when we use the hot water. It starts off ok but as the water gets hotter the noise gets worse until the boiler stops. It then starts again and goes thorough the same cycle.
Also every now and then the boiler will not fire at all (it runs) but no CH or DHW until I reset a small red switch which I think is on the overheat thermostat.
I've seen several posts on sites saying how crap these boilers are but I'm stuck with this at the moment.

DIYimpaired

 

[Agile]

Its not possible to say anything apart from it might be overheating.

It is old and should be replaced. You are not "stuck with it" you just need to have it replaced.

You will find it hard to get any engineer to repair it.

I would if it were in our area but few others will!

Tony