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Discuss combi boiler, pressure continuously increasing. in the Central Heating Forum area at PlumbersForums.net

Hi,

I have a vaillant ecotec plus 837 and one day noticed the pressure was maxed out therefore bled the radiators to drop it down to 1.2~1.4 bar.

Two weeks later, I noticed my pressure increased back up 2.5 bar so had to bleed the radiators again.

A guy at work told me the increase in pressure is probably is due a failure in my filling loop. What are other peoples views on why this is happening?

Thanks in advance.
 

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