Konica 7020 f34-1 and f34-4

Hiya, Ive just replaced the heat and pressure rollers in a 7020 copier, (used to work in the industry and lost my manual/notes) its coming up with 34-1 which I thought was go into 25mode reset bit 3-1 to off, now its coming up with f34-1 and f34-4 Ive rechecked the thermistor there was a tweak to ensure the left hand one wasnt rubbing onthe new roller, and the right pair of sensors look clean but now its not going away, would that suggest the left one is faulty? Havent replaced the right pair yet although I do have a set.
Any ideas?

Thanks
Steve