S
srgs
Hi all I have just changed fan in potterton prima 40f . I replaced gasket that came supplied which attaches to the fan but was unable to change gasket off the flue elbow which was a bit worn . Turned boiler on and works fine to start with then notice signs of flame lift vitiation after a while . I've ordered a new gasket for flue elbow but was just wondering if should be checking other thing as well.as prior to changing fan this wasn't a problem cheers in advance