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Hi I can't thank enough - but thank you so much for taking time to explain all the steps in detail. The boiler is now playing again with low pressure - it's now losing 0.1 bar every day. As you said, it might be due to the air being let out by the air separator (not the vent - but a separator...

The pressure was set to 1.0 after I bled all the radiators. The boiler held the pressure for 2 days, but it now dropped to 0.9.

Thanks again for your detailed explanation. Having monitored the pipes for a week now; its definitely the sound of air rushing through (or trapped in bends and not able to flow through). I did an extensive bleeding process. I had my friend in loft and I started from G floor and bled the...

Thanks for your suggestions. I will bleed the radiators for long time as you suggested. We hear lot of noise when they warm up (as u said) and again when we switch off the boiler. We inspected all the pipes and can confirm that they are not shaking and they are tightly wedged into the joist...

Thats the list of radiators we have. BTU Second Floor Radiator1: 9727 Radiator2: 6532 Radiator3: 7186 First Floor Radiator1: 5836 Radiator2: 11345 Radiator3: 3404 Ground Floor Radiator1: 10452 Radiator2: 5350 Radiator3: 6532

Thanks for your reply. He has balanced the boiler today, i.e. reduced the thermostat level in second and first floor. And set the ground floor radiators to maximum.He also reduced the pump speed on the boiler. Since then I can see the boiler holding up the pressure, however the air still...

Hi Total radiators : 11 ( including 2 towel radiator)

Hi Yes, the pipework which are installed under floor board (between 2nd & 1st floor and 1st floor and G floor) are creaking. Some of the radiators bleed air for few secs and then the water comes out. What makes me to wonder is, every time the engineer flushes out the system, pressurise it...

Hi We live in a town house (three story - Ground, first and second floor). We were using Warm Air Unit (WAU) for central heating. We recently removed it and installed vaillant combi boiler (vaillant ecotec exclusive green iq 843). This boiler is installed in loft (technically third floor). The...