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The gauge read 1.5 bar when I refilled the system. It goes up to 1.9 to 2.0 bar when CH on. When CH off it now drops to about 1.2 bar. So nothing major but is this normal? Or is something wrong.

Over a week would you expect to see any pressure drop on a Worcester Bosch 28 CDi? I have seen a very small drop over about a week after re-pressurizing the expansion tank and cleaning and re seating the PRV

Thanks for the info. I will try that.

I thought that someone may say, " you shouldn't be getting water out of the auto air vent, that's wrong, there is a fault else where on your boiler". Maybe something like that????

Thank you Sherlock!

When I had probs I did turn the knob around to see if it let pressure or water out. New one it is then

Ok thanks. I did re -pressurize the expansion vessel as it was flat. Sounds like I need a new relief valve.

Yes there is water coming out of the relief pipe

My Worcester Bosch 28 CDi combi boilers losing pressure. I tried re-pressurizing the expansion tank and re-filling. Pressure up to 1.5 Bar. When CH came on the pressure went up to about 1.9. Over the night time when the boiler goes of the pressure gauge slowly drops to almost nothing. Boiler...

Following previous thread..... Boiler now appears to be working ok. Although..... Small leak from near pressure relief valve and small leak from auto air vent. Anyone any ideas? Thanks

Thanks for your help. I re-pressurized the EV and filled the system again and all seems ok. The only thing is a very slight weep of water from the automatic air vent. Is that normal or should it only be air?

Hi. Thanks for the reply but I don't understand what you mean. What do I need to do? What's flat EV?

Hi, my boiler has been playing up. I noticed a downstairs rad wasn't hot, all the others were. Tried bleeding it but no air in it. So I bled some water out at the valve to release any air. Sure enough it spluttered a bit and then warmed up nicely. I re filled the system and all ok until...