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How do I fix a Potterton combi boiler E168 Lock outfault?

My combi boiler keeps cutting out and registering a fault E168 Lock out signal. Why? and how do I fix it?
Dave Verity, March 2017
This might help...

http://www.mainheating.co.uk/error-e168-installer-advice/

Then again -it might not... My guess is the involvement of a specialist engineer.

Good Luck..., March 2017
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