chrisbooth
Free Member
hope this helps someone.my red fail light came on every time i turned on the heating when system was cold and not pluged into the mains 240 volt.if pluged into mains voltage with the boiler set to hot water it worked.the red light comes on when there is a problem with gas supply. i was told it was the pcb board at 300 pounds .i checked the gas lines and found them to contain a lot of oil deposits which i blew out with an air line.this did not fix the problem,so after looking further i found that the solinoid valve was also filled with oil. this is the valve where the gas pipe enters the boiler.with boiler cold try to fire it up if the red light comes on try warming the valve with a hair dryer,this will make the oil with in thiner allowing the solinoids of which there are two one on either side to opperate properly.when cold the oil is to thick to allow opperation.if this works then the solinoid valve needs to be replaced with a new one at a cost of 68 pounds which is a lot cheeper than a 300 pound pcb board. to help prevent this from happening again it is a good idear to replace the rubber hoses from the gas bottles for stainles steel ones as the rubber hoses can leach oil into the system.you could also fit an oil trap which would help. hope this helps someone