Jaguar Boiler - loss of pressure

15 Mar 2008
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United Kingdom
I have a Jaguar boiler which is constantly losing pressure overnight resulting in a 'FO' message every morning. I refill the sytem and everything is OK until next morning when I repeat the process. The system is not leaking, however I have noticed that water is being dumped out of the pressure relief waste pipe.
Also after refilling the system and switching on the boiler, there appears to be a swirling sound from the pump as if there is air in the system.
Apart from this the boiler functions well - hot water and heating - any ideas
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