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Will do. I will try to have another look at it first hopefully in the next week or so, but will call next time I'm passing if I still have no luck.

I quite often have to go from Essex to Luton (your premises would seem to be just a slight detour-have checked your address using yellow pages and multi-map), so if I have no luck after I next have a look at the board then I may well take you up on your offer. Will let you know. Many thanks.

It may be the wrong source of parts, but unfortunately it is the only one I have. If I can find time I will investigate further in the next week or so and report further if I can find anything wrong. Thanks for your interest

Raden Have finally got round to looking at the board. I put the faulty board back in and checked the bits you said, but nothing was found wrong. I presume that the diode you were referring to was D12. That checks out ok with the DMM. The bit of the circuit that you mentioned was at the...

Raden I like my faults to be different. Thanks for the info. I will have a look at it in the next day or so, just for interests sake (and possibly having another working board). Agile The supplier where I bought it said that they didn't repair them themselves, but sent them off to...

The fault is now fixed. In fact it was 2 unrelated faults, which is why the combination of them appeared so puzzling. Having changed the sequence and modulating boards without any luck, I also changed the distribution board. This removed the fault whereby the high flame light came on without...

Thanks for all your feedback so far. Tried the link as suggested by CC, but that just takes me to the Potterton manual which I already have a paper copy of. Unfortunately it does not contain any circuit diagrams, just flow diagrams and logic sequences. The fault finding sequence doesn't take...

It was a reconditioned board bought from a reputable local supplier and sold with a guarantee. Also one of my neighbours is in the trade and he has loaned me 2 additional boards, with the same result. As regards the fan, there is no voltage on pins 23 and 24 of the distribution board and...

Tony thanks for the prompt reply. The sequence board was changed into another identical board from the local supplier, allegedly in full working order. Tests so far. Pump working but fan not. Have shorted across water flow switch but no luck. Air flow sensor checks out at around 1 - 2...

Hi everyone. I have a problem with a Potterton Lynx Electronic Combi boiler. Instead of the normal ignition sequence, the system goes straight to high flame light on, with no attempt at lighting. I have changed the sequence and modulating boards with no luck. The air flow sensor appears ok...