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Sudden Pressure Loss Baxi boiler


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Posted by Mike Conroy on November 13, 2008 at 05:23:13:

Hi

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?

Mike




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