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It's look like everything working fine now. BIG THANK YOU to you all for help. I replaced all water in the system and need put inhibitor now. Which inhibitor you recommend and what amount I need to put in the system.

I booked service for Tuesday and wait what will they say. I located EV but can you explain me how to recharge/ repressure it properly? Need be done on cold/ no pressure in the system, what pressure need to be pressurise (pressure read on the than boiler or on the velve?), and do I need...

Expansion vessel was my suspect. Is that something I can do myself or need engineer? What cost I will be looking to replace that?

Hi all, I'm new on the forum. Have Worcester Greenstar Junior 28i combi boiler. Living in house 3 years now and there was no rcently any work done in the house .Since 1 month I noticed the pressure goes down to 0 bar. First thing wast water leak somewhere and checked all radiators in house...