Are there any heating/boiler engineers here that could help please? I had no heating/hot water on Thurs night, turned boiler off and on again, that didn't work then it started making strange noises so turned it off. I had someone come out on Fri through home emergency cover with my house insurance. He thinks the boiler is overheating and a blockage is causing it. He took a water sample as thinks its sludge in the system, but that will take a week or so to get the results. I spoke to my insurance company today who say they won't cover it if it is sludge, so I need to find someone myself who can come and have a look for me. It's an old Baxi Solo boiler. Thanks