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Well I have no idea what happened there but I thought I would give it one last try and hey presto - away she went! Many, many thanks to all who contributed to a happy ending - it really is very much appreciated. Thank you!

OK guys. Thanks for all your help so far but I am still a gnat's whisker from success I'm afraid. Following ollski's comment, I thought I had better double-check and the connector was properly connected. So that suggested to me that either the gas valve was failing to open or the igniter...

Well here's the next, but sadly not the final instalment. The good news is that the board has arrived and been installed and shows no sign of being fried. D_Hailsham's diagnosis for the two black leads that go to the pump was spot on and thus far I am extremely happy and grateful...

I'm afraid that I'm going to have to tease you with an 'I don't know'! I definitely fried the board when it was misconnected and have to wait for its replacement to arrive to be able to answer the question. I hope and trust that now that I know how to test which way round the pump...

D_Hailsham - thanks a million! What a fantastically clear and logical explanation - thank you! As a newbie I am most impressed by the knowledge and kindness from all the contributors to this topic. I hope that other Suprima Potterton PCB sufferers will find this a useful reference in the...

Thanks all for pointing out how stupid I was not to note the terminal positions properly at the outset. You now have me worried that the two blacks with the loose red sleeves which presumably feed the pump can be connected 'back to front' and fry another board. Is there any way of telling...

OK - thank you all for your input and sorry to create confusion. The SINGLE cable is a five way multicore cable. As manufactured, it is twin and earth plus two black cables in it. Clearly the twin and earth are the bog standard supply to the boiler. The other two have two very loose short...

Many thanks for the feedback - much appreciated. To try and answer the questions: 1) I am not an expert but I assume there is no flow switch fitted because there appears to be no wiring that fits the description in the fitting instructions for flow switches. 2) I believe that the pump is...

We have a Potterton Suprima 100L which appeared to have developed the well-publicised PCB fault. I ordered a new PCB and have fitted it. When I power it up however, it has a continuous red LED. The fault diagnosis stuff tells me that it is a wiring fault and that either the PCB is faulty or...