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Gents, Is it just 0341 in this diagram (the fibre washer for the 3 port valve) that is the common source of leaking and pressurising the system? This is near the tail piece, so i presume it's the one being talked about. Thanks Rob

I wasn't trying to re-presurise it. Just pushed the needle on shrader valve to make sure water didn't come and and pressure went down 0.1barg. Plate HE - is this the secondary heat exchanger? My boiler is a vokera 20-80 RS Flowmatic. Not worth changing the previously mentioned...

Haven't had chance to drain the system fully yet, but i measured the exp ves pressure which was 1.8bar - as was the water pressure gauge on the front of boiler. Let a small amout of air out of vessel and pressure on gauge came down by same amount. I think this means the exp vess is OK and...

Please....

Any chance of seeing these photos again? It might help me. Thanks Rob

OK understood. If the exp vess is losing its charge thought this could explain the increase with use of the CH? I should really confirm this first before eliminating the exp vessel. The exp vess was flat when pressure was rising to 3bar and when recharged to 1bar and heating on for 3 hours...

Yes i understand the pressure will go up with heat. 2 weeks ago i drained system set ch exp ves to 1bar filled system to 1 bar. Heating on and upto about 1.6 then back down. now cold system pressure is at 1.5bar so having the heating on is causing a system pressure rise as the exp vess is...

Gents - bit more advice please. The pressure on the guauge is climbing slowly so i believe the expansion vessel is losing pressure. I will re-test the pressure with an empty system to confirm the drop. Is adding a new expansion vessel something i can do myself? A bit of guidance would be...

I drained the system fully earlier this evening and the CH exp ves had bugger all pressure in - didn't register on pressure guage but was a small hiss when i put the footpump on. Pumped up to just under 1bar. Re-filled and vented as described and set cold system pressure to 1bar. CH been...

Guys, Sorry to keep posting items - it's just i've struggled for an answer on this one. My DHW expansion vessel has zero pressure in. Nothing in manual and Vokera didn't respond. Just found this : DOMESTIC HOT WATER EXPANSION VESSEL This vessel is a smaller version of the heating...

Thanks DP, will try this tonight. Why only 0.7bar though and not 1 like in the manual. If this is from your experience, then i will be guided by you. Cheers Rob

I set the cold water pressure at 1.35bar yesterday evening and this morning was just under 1.5bar Have not used the heating only hot water. Could this still be explained by an incorrectly pressurised expansion vessel (CH)? Obviously i don't want to drain the system if not. If i do drain...

I will try that tomorrow night hopefully. Say i have set my cold water pressure at 1bar and dont use the central heating - am i right in thinking that using hot water should not cause any increase in system pressure as the heating is an isolated circuit with the expansion vessel as part of...

Hi, I checked the expansion vessel pressure with a car tyre (schrader valve) indicater. It was 1barg. I think i checked it when the heating had been off for a while so the system pressure (cold) would have been between 1 and 1.5bar. I see what you are saying. The 1 barg quoted by vokera...

thanks for the reply Chris, It's not that i'm after a cheap solution - naturally everyone wants this to any problem! I have tried the obvious things (for me) and it's not them. I know i need help from an engineer hence my questions regarding price. From your response i assume you think a...

Gents, Still having the rising system pressure problem on my vokera 80-20. It's def not the filling loop and CH expansion vessel is at the correct pressure 1barg. Had the heating on the other day (for a while) and went to check the pressure and was about 3.2bar. Why hasn't the safety...

cheers for the advice. Have had a look at the manual/instructions and am struggling to locate this washer. Does the stuffing box washer have a different name? thank Rob

I have a Vokera 20/80 RS Flowmatic boiler and the system pressure has risen up towards 3 bar when hot and when cold always ends on a higher pressure that it was set to. For example, i'd set the system cold to 1bar and then few days later after the heating has been on it will rest at...