While you wait for answers, we may have found some information which could help you.
Click here for Boiler Fires CirculationHas the Pulsacoil system have to be drained to replace the thermosistors?
Rayburn Driven Central Heating Problem - Upstairs Cold?
How do I stop my radiators staying cold at the bottom?
i need to increase the pressure on my highflow 400 electronic rsf boiler?
what is the problem with my RDJ10RF TRANSMITTER/RECEIVER?
Pressure problems on rsf 820/20?