C1 fault on Worcester Bosch Greenstar 8-30

Joined
24 Oct 2012
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Somerset
Country
United Kingdom
Hi all - I've got a slightly odd one here. I'm getting C1 fault code (fan too slow) but the fan is spinning away non stop like a mad thing. In fact the fan is the only thing that is going. No rattling, no clanking, just the fan giving it some. No burn so no heat. Tried turning boiler off and on etc but no change. Any ideas?
 
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Tacho on the fan is probably faulty, either that or the pcb isn't receiving the signal.
 

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