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Posted by Mike Conroy on November 13, 2008 at 05:23:13:
I have a Baxi Combi Instant 105e.
Originally it was providing DHW to 3 areas, central heating & underfloor heating (UFH).
For years it has shown a gradual loss of pressure from 2 – 0.5 over a 2 – 3 week period.
Now the system only provides DHW to 2 areas and to the UFH in 2 rooms and I am trying to solve this pressure loss problem.
I have undertaken the following repairs:-
1. Dismantled & tightened various mildly leaking joints in the boiler.
2. Replaced PRV
3. Replaced AAV and pump O rings
4. Fixed leak on UFH manifold
No leaks are visible now but the pressure situation is actually worse. I have to re-charge the system (with small quantities) every 2 – 3 days now. The pressure appears to stay constant for most of that period then to suddenly drop to 0.5.
Any suggestions please?
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