I have a 6 year old combi which keeps losing pressure and now cutting out after a couple of seconds. Everything seems fine apart from the cut out. If the boiler runs long enough, I get hot water but then it cuts out.
I have looked through previous similar messages and I believe it could be either the exansion vessel or the pump.
Interstingly I disconnect the pump and the boiler still behaved the same (Starts and then cuts out exactly the same).
The boiler has exhibited the problem before usually failing in the morning however I got it to start by switching it on and off a few times.
Below are a few things That may or may not be relevant:
-Boiler Fires up smoothly but cuts out just as water heats up
-Pressure keeps dropping in system (despite no leaks and rads. bled)
-The radiators did have quite a lot of air in them before bleeding
-Shower requires cold water on to get a decent heat (Wasn't always like that)
-Baxi replaced the front panel and gas valve recently.
-Fan makes a lot of noise but works
-Generally the boiler makes a lot of noise starting up but then quietens later.
I have spent a lot of money on this piece of C**p and have been ripped off by baxi who charged =A3235 to get the boiler working temporarily and ignored all the problems I mentioned. Baxi now want more money to fix what they did not fix properly.
Any help apreciated alex