Hi all, we have a heatline vizo boiler, it was only installed last week and has been working fine, it has the correct size pipes to it too. This morning however the pressure on it has dropped really low and as such it wont ignite so we are without heating and hot water. There are several pipes coming from below the boiler with different coloured valves on them, one red, one yellow and two blue. Does anyone know which one changes the pressure? Sorry to be so dim but we are so broke and just do not have the money to call a plumber out to it. Any help would be gratefully received, please no sarcastic comments. Many thanks in advance.