Hi, I recently moved house and inherited a Ferroli He plus 31c. It was found to be leaking when I had it serviced and consequently needed repair to the sum of £400.00. This included a full set of o rings as the plumber was unable to source just the two I required. With a new heat exchanger, return flow sensor and pressure relief valve I was up and running well almost. The two replacement o rings also leaked and the gas engineer spent some time continuously applying sealant to stop water seeping through. Eventually one stopped altogether while the other also needed some special tape - opaque and rubbery looking. Fast forward a couple of weeks all dry, then after four more he came back and put the cabinet on, it needed a shove and yes you've guessed it, now leaks as before and return flow sensor fault already showing on panel. I have no heat or water but can manage for a few days. I know its a Ferroli and he did tell me it was a bad make but I simply do not have £3000.00 to replace. It will take me at least a year to find it so although I understand the best advice is to replace I can't do so. The cabinet is tricky to put on I've seen him do so and I can see why it affected the o rings. Is there a knack to getting the cabinet on? Is there anything that could create a good enough seal so that it can take the bump? Or alternatively as I have a full set of o rings could any of the others help in some way as in "Houston we have a problem". He will be back from his break on Monday and he is a very nice man but I believe he will be fresh out of ideas, so I'm going to attempt some light diplomacy if you have any ideas. Otherwise it's cold showers this winter. The o rings cost 75.00 so I do have everyone all shapes and sizes. The engineer told me that the points where the o rings fit are slightly out of alignment and that is why they leak. He is corgi reg and knows boilers so I do not doubt his competence, he is also very popular with all the neighbours. The boiler is now switched off, and apart from this leak problem has worked well in all other respects. There are three pics in an album called boiler but I can see no way of actually adding them to the post.