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OK, some more observation.. * when opened the kitchen tap slowly (at low flow) to create a demand through boiler; red LED flashes for less then a second!! and go back to OFF, even the kitchen tap is having demand...!! after a minute of so, it switches ON (imagine when residue hot water is run...

Tony, just to be sure I have opened new thread. See if that helps. See here Cheers, Ketan

Hi Tony, thanks. - guess I got very similar issue; temp is fluctuating specially at low flow... I have opened a new thread explaining complete problem history.. See here Cheers.

Hi Guys, Sorry if it’s too long story just trying to highlight what was/is the problem of my Potterton Puma 100e and what I have done so far to resolve it. Hope this helps finding real culprit. Had moved to the property since couple of years, serviced the boiler when moved in to the...

I know this post is very old; but if OP reads this and wondering if you could remember and let know what was your solution? I am having similar problem with Puma 100e...So indication of your problem solution would be a great help and would avoid me to start new thread. thanks.

Graham81, Wondering if you had have any solution to this problem; it seems I have got similar problem (but with Puma 100e)...so instead of starting new thread, thought if I can resolve it... If not then will start new thread. cheers.