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For 'reapairman', I did see this refurbished product (may not be right model for you), although I forked out for a new one myself via my service engineer (not cheap). http://www.allsparesdirect.co.uk/index.php?main_page=product_info&products_id=613 I have no idea if the company offers a...

I suppose my mention of conventional fans picked up on your mention of older or early versions. My lay person's guess is that most newer ones are BLDC and the two approaches are ASIC control or micro-processor control. Incidentally the DC (and the need to rectify and regulate voltage) is why...

P.S. For anybody interested, this is not a conventional DC fan but a BLDC (brushless DC) fan. It has a different arrangement of magnets and coils than the ordinary fan and different control arrangements. The two unidentified ICs seem to be a Hall-effect sensor and a fan control ASIC, and it...

I had thought I'd try to get the connection information before really looking at the PCB, but the fact that you chaps have put forward some hypotheses motivated me to take a close look. At the risk of getting boring I will report what I found. On inspection an unmarked DIL 24 pin device (with...

Well, I suppose I should thank you gentlemen for at least bothering to give answers of a kind. I can assure you though that in my case my engineer exists (and was not that cheap). He is of course a man of mature years, although the boiler had only limped just past its two-year guarantee...

And knowing the test values across the fan terminals would make the difference to a person wanting to change a fan themselves? I'd have thought that the information that a do-it-yourselfer changing the fan would have to get the air/gas manifold off and change the gasket on the top of the heat...

Sorry to bump up an old thread, but I've just had my fan on a 28i replaced by a service engineer at age 26 months. The new fan is working fine, but we got to chatting about the way repairs always involve swapping complete components and whether the fan PCB alone could be replaced. The engineer...