Carver water heater

2001 Autotrail Arapaho-Carver water heater .
Would any member know why when my gas bottle is full my CARVER water heater works perfectly as does the fridge, cooker, blow heater but as the bottle is used the carver water heater stops and shows the red light on the wall switch but the rest of the gas appliances still work perfectly . Any ideas welcome . Thanks Joe

Check are all the insolation taps open, there are usually in the van next to the gas locker or may even be in the gas locker. If you water heater is the furthest applicance from the gas cylinder, it possible that there is a small blockage in the gas pipe serving the water heater. There does be oil contain in cylinder gas especially with buntane, and this oil can block pipes

My heater worked fine until I put a full bottle on & then I started getting the red light too. I had LTS look st it while getting other work done & I think the new regulator I had fitted was too strong - 37mbar instead of the original 30. I had to change the regulator to fit modern/local gas bottles. They found the heater was full of dead flies from the previous Owners time (I hadn't owned it long & they were everywhere inc when they were cleaning the fridge elements). I ended up getting a 2nd hand replacement & modern 30mbar regulator. Either way it seemed to be an issue with the amount of gas getting to the heater.