Looking for information on the above combi boiler. Just bought a house with this boiler in it not sure how old it is or if it works even.Topped the pressure up to about 2 bar selected hot water ran the hot tap sounded like the fan runs an indicter next to the selector switch came on a few seconds later a small black button on the left hand side popped out as if it had tripped or locked out any suggestions would be much appreciated.The gas looks to be on at the connections below the boiler.