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:D Hey all is working, I put this picture and explanation here for all to see for a few weeks. Sneakly there was a button underneath the boiler which I pushed like a child puts bananas into VCRs. And hey presto - BLUE FLAME in Window. To help indentify what this looks like on a Potterton F...

IN addition to my previous post I have now checked the wiring and took before and after piccys and just unscrewed and screw the wires back intot he terminal blocks... same symptom, motor running not spark at boiler (note the terminal block I touched was connecting the cyclinder stat, motor and 3...

I have today changed my 3 port valve on this system and followed the rules for draining down and up etc. The valve I changed was to replace a landis and gyr obsolete model with the hortsmann from screwfix.com Anyway replacing wire for wire (except earth as this new one is double insulated...