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What I should have also said is the low and high fire screws were at either end of the ratchet, which controls the oil flow. They are tiny, and are not the large screws on the models shown in the later technical specs.

The low fire screw setting has now been adjused and the rayburn temperature is now back to normal. Thanks for all the help :D

Thanks, sounds like good advice. Re low fire screw I have a lug hole by the control knob but no screw under the plate, same with the high fire, a hole and no screw. Also looks like there is metal under the hole, so guessing something is missing. I've looked at loads of tech specs but cannot...

My rayburn (oil fired) is suddenly running very hot. The bm30 control valve had an accidental knock, the system instead of running at 150 is now around 180. I have checked and corrected the valve level, but no improvement. Next would be to look at making a correction on the low fire...