Discuss System pressure circulation issues in the Central Heating Forum area at PlumbersForums.net

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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.
 
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ShaunCorbs

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No
 
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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

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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
 
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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

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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 'Registered Professional Gas Engineer' engineer
 
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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 'Registered Professional Gas Engineer' engineer
Thanks I’ll call an engineer I think.
 
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Worth having a good look at the system, outside the boiler casing, to understand why an external expansion vessel has been fitted.
 

Riley

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