Baxi heat only boiler - switches off after a few minutes with a red flashing light

[azzy44]

Baxi heat only boiler (7 yrs old) - switches off after a few minutes with some banging noises followed by
a red flashing light on boiler
Reset the boiler manually after 5 mins and it runs fine all day
Next day when i switch on the boiler on it does the same thing
ive opened the screw on the pump to see if there is air - thats fine
ive cleaned the magnaclean filter too

any help appreciated

thanks

 

[Jonathanjc]

How olds the pump and what's your water quality like?

 

[ShaunCorbs]

Is the pump spinning ?

 

[king of pipes]

Its a circulation issue you really need a RGI all gas boilers need a service and a full gas safety check every 12 months , your system needs draining and flushing every 5 years and new inhibitor added you really shouldn't be fiddling internally in the boiler unless your gas Safe registered. Kop

 

[azzy44]

How olds the pump and what's your water quality like?

pump is also 7 yrs old

 

[azzy44]

Is the pump spinning ?

yes pump is spinning

 

[azzy44]

Its a circulation issue you really need a RGI all gas boilers need a service and a full gas safety check every 12 months , your system needs draining and flushing every 5 years and new inhibitor added you really shouldn't be fiddling internally in the boiler unless your gas Safe registered. Kop

the thing that puzzles me is that it only occurs at the startup every morning , once its reset it runs fine all day, id expect it to cause issues at other times too

 

[azzy44]

Pump is GRUNDFOS UPS2 15-50/60​

Started up the boiler today and sat next to pump,
on startup it was making a noise, not grinding, but more like a crinkling sound for about a minute or 2 and then it makes it very occasionally . Is this normal?
i also opened the bleed valve on it yesterday
the boiler did not switch off today lol