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Problem solved - it was indeed the heating zone valve - it's the white one in the background, not the one opened in the foreground. The lever that actions it manually was being dragged with the motor when valve opened, and when trying to close, the lever was blocking the motor of closing the...

Thanks ! I'll take it piece by piece and see how it goes. If there's something I'm fully confident with, is wires ... :) a bit less with pipes though :)

picasso, thanks for the fast answer. is there any resource(s) around here in order to: 1) find location of the zone valve, 2) confirm the fault 3) establish whether this is a DIY or not Thanks!

thanks - it does stop for tap hot water and sometimes for the radiators ... problem is - it's not consistent behavior ... and I cannot explain the error (red blinking) on the boiler when it goes wrong. one thing crossing my mind that might cause an issue - if the heating window (ending let's...

no, it worked just fine in the last 4 years, we started experinencing these issues intermitently last winter. However, a reset would fix it and we did not call anyone.

I won't try to DIY with this one ... however, I would like to understand what's happening. How can I check the boiler temperature setting?

Hi, Thanks for replies so far. A couple of clarifications: 1) The system works flawlessly for heating up the bathroom / shower water. So, I assume there's no miss-alignment between the Promax and the cylinder here. 2) The problem starts developing only when we switch Central Heating on (for...

Hi, I don't want to hijack the thread - however, this is the only about POTTERTON PROMAX 15 SL so people might be in the "know" here. I have a santon premier plus PP210B unvented indirect cylinder up at 2nd floor in conjunction with a POTTERTON PROMAX 15 SL placed down in the kitchen, and...