We may have found other answers which could help you.
Click here for Heating Sensors Replacement
Has the Pulsacoil system have to be drained to replace the thermosistors?
My oil-fired Rayburn has gone out, recently serviced?
Pressure problems on rsf 820/20?
rwb 200?
how do i bleed a rayburn 480k system?
How do I stop my radiators staying cold at the bottom?