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Potterton Promax 12 SL boiler intermittent

I am having same problem. Vibrations coming from boiler blue light changes to orange. After a few minutes ok. Very frightening. Had engineer out was working ok. Seems intermittent fault. Any clues? Potterton SL Condensing boiler fitted june 2013.
 
you are not having the same problem, as already advised, it is against site rules to hi-jack posts, you have to start your own post if you want the correct advice, it just gets confusing otherwise
 

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