The valve was stuck closed. Released it and refitted it and now the boiler fires up properly when switched on but after about 1 minute I get a F1 fault on the digital read out?
Boiler has decided to pack up over the weekend, its a GlowWorm 30cxi.
Have tried simply switching on and off but that does nothing.
Have then tried opening the blue valve underneath to fill the system and build some pressure (currently 0.4 bar) but thats doing nothing also.
Anyone any...