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potterton boiler keeps closing down?

Boiler keeps closing down and shows low water pressure .when I top up to required level it runs for a while and then goes to high-pressure and I have to close it down and drain some water out of system. This has been recurring for 2-3 weeks
Clem, December 2016
You possibly have a problem with the expansion tank. It may have a leak or it may just need repressurising. Have it checked by a Competent Person

XXX, December 2016
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