Hi,
My boiler has been shutting down as the pressure will rise well above 1bar or go to low. This then shows the F1 or F4 fault code. I can re-start after I have adjusted the pressure. Are these problems connected?

spookshave, October 2012

F1 and F4 are both gas related codes, nothing to do with water pressure as such. Set pressure of system to 1 bar, when cold, it will go up when hot, returning to 1 on cooling down.
F1. No gas, Insufficient gas, Incorect gas valve adjustment, Electronic Ingnition lead defect, Electronic Ignitor Defect, Check Air inlet duct, Check connections to ignitor unit, F4 As F1.

SD, October 2012