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Thanks for your help Ian. The potentiometer didn't solve it so I called Ravenheat tech support and after explaining the situation was advised to fit a room stat. I have now done this and although the boiler still cycles the time is greatly reduced. Also the boiler and pump shut down for periods.

Thanks Ian. My next question is - Is there a GSE on this forum, convenient for Stockport, who wants to do the job?

Hi Agile, Thanks for the rapid reply. I didn't see any adjustment being made when PCB was fitted. Looking at the old PCB, there only appears to be one adjustment point which I think is a potentiometer. I have spoken to 2 GSEs and only one mentioned removing a jumper( whatever that is). The...

Hi Ian, There are 3 rads on the ground floor and 4 on the first floor.

Hi, I have a Ravenheat White Star LS100 about 15 years old. No room stat but TRVs. Recently it would not fire and the PCB was replaced and a boiler leak fixed. The boiler now runs for 10/15 minutes then starts cycling 30 seconds on/off. I have tried adjusting the rads and the pump speed to no...