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OK Tony, appreciate that. I'll have another look at those and let you know how I get on.

Thanks Tony, clearly adjusting the microswitch won't find the fault, but I'm still not clear on the sequence of operation. Would an intermittent fault with the full sequence board, or some sort of poor connection with the fan, pump or other electrics really be able to affect the flow...

Tony, I've watched it when it fails and the pin comes out but not enough to make the switch connection. I can push the pin in but it is nice and stiff. Gas4you, I did consider adding something to the micro switch as suggests, or bending the lever on it to make it earlier, but seem to recall...

Thanks Tony, I am right about the diagnostic lights. As I say the pump turns freely, and there was no sign of any debris when I opened it up. Are you saying it could be an intermittent fault with the pump, or is it worth taking of the HE plate to check for a blockage? Do you think that it is...

I have been in my place for about a year and have a Biasi M90 24s boiler. As far as I can make out it was installed in 2002 and I have receipts for a replacement PCB in 2003 and a replacement fan unit in 2006. Over the past few months the water hasn't seemed as hot as it was and is not...