Vaillant Turbomax Not Getting Constant Power To Fan

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I've got a problem with a Turbomax Plus 824/2 E combi. Though it's getting on, it's in decent nick. Not getting any fault codes. When it gets heating or DHW demand the pump starts but it doesn't get any futher than S3 on the status codes before finishing on S33 which means check air or flue.

At first I thought it was air pressure switch, but that seems ok. Then I realised the fan isn't running. Checking the fan's power supply with my meter and it is only getting two or three very short split second bursts of power that barely register on my meter during the start up process before giving up. Pressing reset gets it to try again, but once again never gets past the initial pump starting phase - ie. never gets as far as firing.

Can any of the experts point me in the direction of what would cause the fan to only get two or three short bursts of power please? Thanks in anticipation.
 
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