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.. ahhh .. I understand ... ... I have to go now .. but I'll concentrate in the righthand PCB tonight .. I'll unclip all connectors, remove, clean and reinstate ... see it that helps, if not I check for dry joints and the R's you suggest ... thanks for all input so far .... I'll keep you...

,, hmmm .. bit confused? ... you say "it is likely to be the PCB", but "(you) would check something in the CB" ?? ... which is it the CB sensors or the PCB? .. the PCB is a "Bertoli Partners?" (its a 2005 boiler) ... the ? is becasue I took foto of PCB to save time and its a bit blurry...

:o) .. I can only afford beer and kisses ... I guess beer will be best currency :o))))) ... checked the cables (thermocouples? i assume) out of chamber .. seem fine and well ... they go to right PCB, so assume this is the ignition control PCB. Jiggled them and check there seating on PCB ...

..cheers .. I will check both .. will take me 10 mins or so .. will update when done .. cheers again tony ... you seem more thorough my engineer that called ,o)

Hi Tony .. many thanks for reply ... all pipes out of boiler are clear ... and engineer "blow back" into condensate fitting and seemed happy this was not blocked .... (not sure if this is a 100% confirmation test? .. any others) ... which PCB is the most likely to be the problem ... left...

Then it gets more expensive and you need a blender (to cool the water down to 50C for the UFH) and an extra pump for this circuit and all the electics needed .... polypipe also sell all this kit .. I have only installed a totally UFH system, so can help eny more ... good luck

HI .. I've installed 3 wet systems in the properties I've build last 4 years ... I've used polypipe kit for the manifolds .. and bought the pex pipe from Screwfix ... it can be very simple and cheap to design and install if you are JUST running UFH off the boiler .. but of you have radiators...

Hi ... got the dreaded green-flashing+red solid+green flashing symptoms are: - boiler fires up fine when CH on, gas burners fire as normal - after 10 seconds shuts down and Lock-out comes on - can clear lockout as normal, but when restarted only last for 10 seconds before lock out again...