We have a caravan with a Worcester 24CDi Combi boiler fitted. Since it was moved to a new plot the water has not heated, and now the central heating has failed too. The pressure is a little under 1 bar - would this be the problem? We've had a plumber look at it and he's replaced the valve and the PCB board (?) but it still happens. A plumber is now replacing the pipes as he's been told they are too small bore for the boiler. However the caravan is 5 years old and has the pipes it's always had. The boiler tries hard to light if the gas fire is on at the same time, but goes out after a little flame fluttering. If the fire isn't lit it doesn't even try to light. Anyone got any ideas as the people currently looking at it are fast giving up!