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Aristion combi boiler; e33/34 and no water in condensate trap?

Every since our boiler was installed we have never had water in the trap, but recently the boiler has had E33 and E34 codes and not provided hot water; Any advice
terry; west mids August 2009, August 2009
E33 & E34 indicate a problem with the pressure switch, have a qualified engineer take a look at it.

Ian, August 2009