Wonder if anyone can help with some advice here? about 1 month ago my central heating stopped working without warning so i called out the company who have the maintanince contract. The engineer looked at the boiler and said it was the pump that was away, he had to order a new one and returned 2 days later to fit it. When he fitted the new pump there was still nothing from the boiler, while checking this he had the boiler running and had the thermosatat removed from the front of the boiler a Baxi 51/3 RS. He went upstairs and stuck something down one of the pipes still with the boiler heating and no thermostat in place, he discovered that one of the pipes were blocked and cleared it but was also told it could have been an air lock. As you will know the boiler by this time was still heating and as soon as the water got through it blew water everywhere in my kitchen and i have since learned cracked the heat exchanger resulting in a wrecked boiler. He was apologetic about what had happened and told us that the companies insurance would sort it all out. Since then there owner of the company has denied any liability to what has happened and told me that i have to buy a new boiler as their engineer was not at fault. They also stated that blocked pipes do not happen to system that are properly fitted and this is what caused the damage although there were no leaks until this happened. This company have also had the service contract for the last ten years and have been happy enough to take the money when there are no problems. Can anyone help with what i have described and how would i stand if i take this further which i plan to do, i have contacted Corgi who are doing a report although they don't seem to want to get involved and have had anther plumber look at it and without doubt he says it is what the engineer done that caused the damage. Any advice would be most appreciated.