My boiler does not heat water using the electricity. As far as I can tell there are various warning lights to indicate most problems but indicate that the heating elements are kaput other than the fact that everything looks normal at the controls but the water just refuses to heat. Before starting to work on the boiler, for safety, I turned off the mains electric hookup, switched off the 12 volt power system and turned the gas off at the gas bottles in the gas locker. The van has not been used for a couple of months. I have checked the obvious things like live power to the boiler, fuses not blown etc but nothing. I haven't found any videos or pictures of how to do it so I'm going to take you through my attempt to replace the heating elements which are currently on order at the extortionate price of £309! You have to access both ends of the boiler so it probably needs to be removed from your van and put on a bench. To achieve this you need to disconnect both the mains and 12 volt electric cables. I have taken a photo of the 12 volt connections so that I can put them back in the right places on the printed circuit board. There are 4 hot air tubes to be removed which are held in by 4 philips headed screws. There are hot and cold water connectors to be removed so make sure that you have emptied all the water from the van and boiler before removing these. The gas connection needs to be removed which needs a 17mm spanner. The exhaust pipe has an outer sleeve which needs to be removed which again needs a philips screwdriver. Inside there is the exhaust pipe with a clamp that on my Autotrail Savannah 2010 has a star drive screw. There are 4 large philips screws holding the boiler to the floor. You can then lift the boiler out and as its made mostly of aluminium its not too heavy. I rested mine on a garden bench with the water outlets downwards to let out the remaining water. Here its is now on the dining room table ready for dismantling though the electric overs have already been removed. The top 12 volt cover just unclips. The 230 volt cover needs to have 2 star drive screws removed at top left and top right. I have also removed a cooling fan cover which just unclips and slides up. Photos to follow shortly!