EH52ARH said:
There is also a small shut of valve near to the gas bottle regulator, make sure that is turned on. This is so that you do not loose all the gas in the system when you change gas bottles over.
There is a yellow handled valve just below the regulator but this should be left ON all the time.
It is only there to allow pressure testing of the system, it is NOT meant to be used for any other purpose.
This is assuming that you have a bulkhead mounted regulator, if a direct cylinder mounted regulator this valve is not present.
You will not lose gas from the system when changing cylinders as there is a non return valve built into the pigtail with a bulkhead mounted regulator and the regulator itself will not allow gas to backflow, with a direct cylinder mounted regulator the regulator itself has a non return valve and will not allow gas to backflow out of the pipework.
With the cooker, fridge and space heater the control knobs MUST be pressed in and held in whilst the heat from the flame energises the thermocouple.
With the water heater it will just shut down after a short time until gas is present.