Overheating and noisy Baxi boiler

[Rob Boyle]

I have a Baxi boiler which keeps overheating. After resetting, it would be ok for a few days and then would trip out again. I have just changed the internal thermostat and since then it overheats more quickly and has now started to make lots of clanking noises and throwing water out of the overflow pipe before overheating.

I am considering replacing the overheat sensor next but this could be a waste of money.

Any ideas would be appreciated

 

[penpusher]

If it's making noise and overheating it's more than likely that your pump has jammed or is running slowly

 

[billington]

Which Baxi boiler is it ?

 

[Rob Boyle]

It's a Baxi Solo 350 PF.

If it gives any clues, It started doing this after intermittently a few months ago after I drained the system and inadvertently ran it for a couple of mins before the water had reached the pump. Sounds like it could be the pump malfunctioning, even though it seems fine. Should I try running the pump on high speed instead of low???

What I don't understand is why it got much worse at the w/e when I had changed the stat.