System pressure circulation issues

[Funky dog]

If you have a weak circulation pump inside a combination boiler, will this cause the pressure of the system to rise? Eventually making the system over pressurise . The radiators get hot but it is only a small circuit with very small radiators so even with the boiler thermostat turned right down all radiators in the property get hot really quickly.

 

[ShaunCorbs]

No

 

[king of pipes]

Time for a service Mr dog

 

[Riley]

Noooooo

 

[Brambles]

If the pressure is rising significantly on a hot system then it is probable that there is insufficient ( or failed) provision for expansion in the system

 

[Riley]

Brambles, please familiarise yourself with the forum role as the information you provided could potentially be deemed pertaining to the DIY repair of the boiler

 

[Funky dog]

Brambles, please familiarise yourself with the forum role as the information you provided could potentially be deemed pertaining to the DIY repair of the boiler

It’s a halstead combi boiler with a extra external expansion vessel that’s been fitted on the return side of the heating Circuit. The pump is internal and has a weak pump. If the pressure was set to one bar it rises reasonably quickly to 2 bar I’ve been told it was a new expansion vessel recently fitted.

 

[Riley]

Does it continue to rise or plateau?? Pressure will rise when heated. Anything else you are guessing. Weak pump is inside boiler so needs a GSR engineer

 

[Funky dog]

Does it continue to rise or plateau?? Pressure will rise when heated. Anything else you are guessing. Weak pump is inside boiler so needs a GSR engineer

Thanks I’ll call an engineer I think.

 

[Brambles]

Worth having a good look at the system, outside the boiler casing, to understand why an external expansion vessel has been fitted.

 

[Last Plumber]

How do you know the pump is 'weak'?

 

[Funky dog]

How do you know the pump is 'weak'?

Removed the cap and it stopped with a slight touch with a screwdriver

 

[Riley]

Right as has been said. Pump inside boiler. You are now in the realms of needing a GSR so please respect the forum rules and dabble no further.