DIY Doctor

Overfilled Worcester Bosch Greenstar 30 CDI Combi and now Won't Hold Pressure?

Postby Peter Hilsdon » Thu Aug 20, 2015 11:38 am

I wonder if anyone can explain what I have broken and what I need to get fixed ?
I looked at my Worcester Boiler CDI Greenstar 30 this morning and noticed it's pressure was a bit low, so I used the filling up point as I have often done for years, and went to adjust a little bit, but made the mistake of overfilling Ops !!! (on the pressure gauge ) not sure what the pressure went up but into the RED.
The Problem I now have is that when I try to fill up the system with water the pressure will now not hold at all ( When system is ON or Completely OFF )
The water goes in but now comes straight Out again on the overflow outside.
Any help would be appreciated
Peter Hilsdon
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Simply Build It

Postby decking » Fri Aug 21, 2015 8:57 pm

I'm no heating engineer, but if you have over pressurised the system, then maybe you are still trying to overfill a full system.
Drain down until the pressure drops to below the norm, then carefully refill.
Ours runs at 1 bar.
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